# Patent

## Title
Zoom lens system, imaging device and camera

## Abstract

A zoom lens system of the present invention has a plurality of lens units each composed of at least one lens element and, in order from the object side to the image side, comprises: a first lens unit having negative optical power and composed of two lens elements; a second lens unit having positive optical power; and a third lens unit having positive optical power, wherein in zooming, the lens units are moved such that an interval between the first lens unit and the second lens unit should decrease and that an interval between the second lens unit and the third lens unit should increase, so that magnification change is achieved, wherein the first lens unit is, in order from the object side to the image side, composed of a first lens element having negative optical power and a second lens element having positive optical power, and wherein the condition is satisfied: 0.50<fL2/fT<1.00 where, Z=fT/fW>4.0, ωW>35, fL2: a focal length of the second lens element, fT, fW: focal lengths of the entire system at a telephoto limit, a wide-angle limit, ωW: a half value of the maximum view angle at a wide-angle limit.

## Background
TECHNICAL FIELD
The present invention relates to a zoom lens system, an imaging device and a camera. In particular, the present invention relates to: a zoom lens system that has not only a high resolution but also a reduced overall optical length (overall length of lens system) and a variable magnification ratio as high as approximately 5 and that has a view angle of approximately 70° at a wide-angle limit and hence is satisfactorily adaptable for wide-angle image taking; an imaging device employing this zoom lens system; and a thin and remarkably compact camera employing this imaging device.
BACKGROUND ART
With recent progress in the development of solid-state image sensors such as a CCD (Charge Coupled Device) and a CMOS (Complementary Metal-Oxide Semiconductor) having a high pixel, digital still cameras and digital video cameras (simply referred to as “digital cameras”, hereinafter) are rapidly spreading that employ an imaging device including an imaging optical system of high optical performance corresponding to the above-mentioned solid-state image sensors of a high pixel. Among these digital cameras of high optical performance, demands are increasing especially for digital cameras of compact type.
In digital cameras of compact type described above, from the perspective of easiness in carrying and accommodation, further thickness reduction is required. For the purpose of realizing such compact and thin digital cameras, in the conventional art, variable zoom lens systems have been proposed that have a three-unit construction of negative lead type, in order from the object side to the image side, comprising a first lens unit having negative optical power, a second lens unit having positive optical power and a third lens unit having positive optical power and that have a reduced overall optical length (overall length of lens system: the distance measured from the vertex of a lens surface on the most object side in the entire lens system to the image surface).
For example, Japanese Patent Publication No. 3513369 discloses a zoom lens which, in order from the object side to the image side, comprises three lens units of negative, positive and positive and in which: at a telephoto limit in comparison with a wide-angle limit, the individual lens units are moved such that the interval between first and second lens units and the interval between second and third lens units should decrease so that magnification change is achieved; the first lens unit is composed of two lenses of negative and positive; the second lens unit is composed of independent two lenses of positive and negative; the third lens unit is composed of one positive lens; and a particular relation is satisfied by the radius of curvature of the object side surface of the negative lens contained in the second lens unit and the focal length of the entire system at a wide-angle limit. In this zoom lens disclosed in Japanese Patent Publication No. 3513369, overall optical length is reduced, and still high optical performance is obtained over the entire variable magnification range.
Further, Japanese Laid-Open Patent Publication No. 2006-301154 discloses a zoom lens which, in order from the object side to the image side, comprises three lens units of negative, positive and positive and in which: the intervals between the individual lens units vary at the time of magnification change; particular relations are satisfied respectively by the taken-image height and the focal length of the entire system at a wide-angle limit, by the axial interval between the first and the second lens units and the focal length of the first lens unit, and by the axial interval between the first and the second lens units and the focal length of the second lens unit; and a variable magnification ratio that falls within a particular range is obtained. This zoom lens disclosed in Japanese Laid-Open Patent Publication No. 2006-301154 has a wide view angle at a wide-angle limit as well as a relatively high variable magnification ratio.
Moreover, Japanese Laid-Open Patent Publication No. 2006-065034 discloses a zoom lens which, in order from the object side to the image side, comprises three lens units of negative, positive and positive and in which: the intervals between the individual lens units vary at the time of magnification change; the first lens unit is composed of two lenses of negative and positive; the second lens unit is constructed from a 2a-th lens unit composed of two lenses of positive and negative and a 2b-th lens unit composed of at least one positive lens arranged on the image side relative to the 2a-th lens unit; the third lens unit is composed of at least one positive lens; and particular relations are satisfied by the imaging magnifications of the second lens unit at a wide-angle limit and a telephoto limit, the interval between the first and the second lens units at a wide-angle limit, and the interval between the second and the third lens units at a telephoto limit. This zoom lens disclosed in Japanese Laid-Open Patent Publication No. 2006-065034 achieves desired optical performance and still has a reduced number of component lenses and relative compactness.

    Patent Document 1: Japanese Patent Publication No. 3513369
    Patent Document 2: Japanese Laid-Open Patent Publication No. 2006-301154
    Patent Document 3: Japanese Laid-Open Patent Publication No. 2006-065034


DISCLOSURE OF THE INVENTION
Problems to be Solved by the Invention
The above-mentioned zoom lens disclosed in Japanese Patent Publication No. 3513369 has high optical performance, a view angle as wide as 65° to 75° at a wide-angle limit, and a reduced overall optical length. This permits further thickness reduction in digital cameras of compact type. Nevertheless, the zoom lens has as small a variable magnification ratio as approximately 3, and hence does not satisfy a requirement in digital cameras of compact type in recent years.
Further, the zoom lens disclosed in Japanese Laid-Open Patent Publication No. 2006-301154 has a sufficient view angle for wide-angle image taking and a higher variable magnification ratio than the zoom lens disclosed in Japanese Patent Publication No. 3513369. Nevertheless, in this lens configuration, the amount of movement of the second lens unit along the optical axis at the time of magnification change is large. Thus, the overall optical length increases, and hence further thickness reduction cannot be achieved in digital cameras of compact type.
Moreover, similarly to the zoom lens disclosed in Japanese Patent Publication No. 3513369, the zoom lens disclosed in Japanese Laid-Open Patent Publication No. 2006-065034 achieves desired optical performance and still has a sufficient view angle for wide-angle image taking and a reduced overall optical length. This permits further thickness reduction in digital cameras of compact type. Nevertheless, this zoom lens has as small a variable magnification ratio as approximately 3, and hence does not satisfy a requirement in digital cameras of compact type in recent years.
An object of the present invention is to provide: a zoom lens system that has not only a high resolution but also a reduced overall optical length and a variable magnification ratio as high as approximately 5 and that has a view angle of approximately 70° at a wide-angle limit and hence is satisfactorily adaptable for wide-angle image taking; an imaging device employing this zoom lens system; and a thin and remarkably compact camera employing this imaging device.
Solution to the Problems
(I) One of the above-mentioned objects is achieved by the following zoom lens system. That is, the present invention relates to
a zoom lens system having a plurality of lens units each composed of at least one lens element and,
in order from an object side to an image side, comprising:
a first lens unit having negative optical power and composed of two lens elements;
a second lens unit having positive optical power; and
a third lens unit having positive optical power, wherein
in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along an optical axis such that an interval between the first lens unit and the second lens unit should decrease and that an interval between the second lens unit and the third lens unit should increase, so that magnification change is achieved, wherein
the first lens unit is, in order from the object side to the image side, composed of a first lens element having negative optical power and a second lens element having positive optical power, and wherein
the following condition (26) is satisfied:

0.50<fL2/fT<1.00  (26)

(here, Z=fT/fW>4.0 and ωW>35)
where,
fL2 is a focal length of the second lens element,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
One of the above-mentioned objects is achieved by the following imaging device. That is, the present invention relates to
an imaging device capable of outputting an optical image of an object as an electric image signal, comprising:
a zoom lens system that forms the optical image of the object; and
an image sensor that converts the optical image formed by the zoom lens system into the electric image signal, wherein
the zoom lens system has a plurality of lens units each composed of at least one lens element and,
in order from an object side to an image side, comprises:
a first lens unit having negative optical power and composed of two lens elements;
a second lens unit having positive optical power; and
a third lens unit having positive optical power, wherein
in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along an optical axis such that an interval between the first lens unit and the second lens unit should decrease and that an interval between the second lens unit and the third lens unit should increase, so that magnification change is achieved, wherein
the first lens unit is, in order from the object side to the image side, composed of a first lens element having negative optical power and a second lens element having positive optical power, and wherein
the following condition (26) is satisfied:

0.50<fL2/fT<1.00  (26)

(here, Z=fT/fW>4.0 and ωW>35)
where,
fL2 is a focal length of the second lens element,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
One of the above-mentioned objects is achieved by the following camera. That is, the present invention relates to
a camera for converting an optical image of an object into an electric image signal and then performing at least one of displaying and storing of the converted image signal, comprising
an imaging device including a zoom lens system that forms the optical image of the object and an image sensor that converts the optical image formed by the zoom lens system into the electric image signal, wherein
the zoom lens system has a plurality of lens units each composed of at least one lens element and,
in order from an object side to an image side, comprises:
a first lens unit having negative optical power and composed of two lens elements;
a second lens unit having positive optical power; and
a third lens unit having positive optical power, wherein
in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along an optical axis such that an interval between the first lens unit and the second lens unit should decrease and that an interval between the second lens unit and the third lens unit should increase, so that magnification change is achieved, wherein
the first lens unit is, in order from the object side to the image side, composed of a first lens element having negative optical power and a second lens element having positive optical power, and wherein
the following condition (26) is satisfied:

0.50<fL2/fT<1.00  (26)

(here, Z=fT/fW>4.0 and ωW>35)
where,
fL2 is a focal length of the second lens element,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
(II) One of the above-mentioned objects is achieved by the following zoom lens system. That is, the present invention relates to
a zoom lens system having a plurality of lens units each composed of at least one lens element and,
in order from an object side to an image side, comprising:
a first lens unit having negative optical power and composed of two lens elements;
a second lens unit having positive optical power; and
a third lens unit having positive optical power, wherein
in zooming from a wide-angle limit to a telephoto limit during image taking, at least the first lens unit and the second lens unit move along an optical axis, wherein
on the image side relative to the second lens unit, an aperture diaphragm is arranged that moves along the optical axis integrally with the second lens unit during zooming, wherein
the second lens unit has a positive lens element on the most object side, and wherein
the following condition (27) is satisfied:

0.40<fL3/fG2<1.00  (27)

where,
fL3 is a focal length of the positive lens element arranged on the most object side of the second lens unit, and
fG2 is a focal length of the second lens unit.
One of the above-mentioned objects is achieved by the following imaging device. That is, the present invention relates to
an imaging device capable of outputting an optical image of an object as an electric image signal, comprising:
a zoom lens system that forms the optical image of the object; and
an image sensor that converts the optical image formed by the zoom lens system into the electric image signal, wherein
the zoom lens system has a plurality of lens units each composed of at least one lens element and,
in order from an object side to an image side, comprises:
a first lens unit having negative optical power and composed of two lens elements;
a second lens unit having positive optical power; and
a third lens unit having positive optical power, wherein
in zooming from a wide-angle limit to a telephoto limit during image taking, at least the first lens unit and the second lens unit move along an optical axis, wherein
on the image side relative to the second lens unit, an aperture diaphragm is arranged that moves along the optical axis integrally with the second lens unit during zooming, wherein
the second lens unit has a positive lens element on the most object side, and wherein
the following condition (27) is satisfied:

0.40<fL3/fG2<1.00  (27)

where,
fL3 is a focal length of the positive lens element arranged on the most object side of the second lens unit, and
fG2 is a focal length of the second lens unit.
One of the above-mentioned objects is achieved by the following camera. That is, the present invention relates to
a camera for converting an optical image of an object into an electric image signal and then performing at least one of displaying and storing of the converted image signal, comprising
an imaging device including a zoom lens system that forms the optical image of the object and an image sensor that converts the optical image formed by the zoom lens system into the electric image signal, wherein
the zoom lens system has a plurality of lens units each composed of at least one lens element and,
in order from an object side to an image side, comprises:
a first lens unit having negative optical power and composed of two lens elements;
a second lens unit having positive optical power; and
a third lens unit having positive optical power, wherein
in zooming from a wide-angle limit to a telephoto limit during image taking, at least the first lens unit and the second lens unit move along an optical axis, wherein
on the image side relative to the second lens unit, an aperture diaphragm is arranged that moves along the optical axis integrally with the second lens unit during zooming, wherein
the second lens unit has a positive lens element on the most object side, and wherein
the following condition (27) is satisfied:

0.40<fL3/fG2<1.00  (27)

where,
fL3 is a focal length of the positive lens element arranged on the most object side of the second lens unit, and
fG2 is a focal length of the second lens unit.
EFFECT OF THE INVENTION
According to the present invention, a zoom lens system is provided that has not only a high resolution but also a reduced overall optical length and a variable magnification ratio as high as approximately 5 and that has a view angle of approximately 70° at a wide-angle limit and hence is satisfactorily adaptable for wide-angle image taking. Further, the present invention provides: an imaging device employing this zoom lens system; and a thin and remarkably compact camera employing this imaging device.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-1 (Example I-1).
FIG. 2 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-1.
FIG. 3 is a lateral aberration diagram of a zoom lens system according to Example I-1 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 4 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-2 (Example I-2).
FIG. 5 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-2.
FIG. 6 is a lateral aberration diagram of a zoom lens system according to Example I-2 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 7 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-3 (Example I-3).
FIG. 8 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-3.
FIG. 9 is a lateral aberration diagram of a zoom lens system according to Example I-3 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 10 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-4 (Example I-4).
FIG. 11 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-4.
FIG. 12 is a lateral aberration diagram of a zoom lens system according to Example I-4 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 13 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-5 (Example I-5).
FIG. 14 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-5.
FIG. 15 is a lateral aberration diagram of a zoom lens system according to Example I-5 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 16 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-6 (Example I-6).
FIG. 17 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-6.
FIG. 18 is a lateral aberration diagram of a zoom lens system according to Example I-6 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 19 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-7 (Example I-7).
FIG. 20 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-7.
FIG. 21 is a lateral aberration diagram of a zoom lens system according to Example I-7 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 22 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-8 (Example I-8).
FIG. 23 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-8.
FIG. 24 is a lateral aberration diagram of a zoom lens system according to Example I-8 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 25 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-9 (Example I-9).
FIG. 26 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-9.
FIG. 27 is a lateral aberration diagram of a zoom lens system according to Example I-9 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 28 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-10 (Example I-10).
FIG. 29 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-10.
FIG. 30 is a lateral aberration diagram of a zoom lens system according to Example I-10 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 31 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-11 (Example I-11).
FIG. 32 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-11.
FIG. 33 is a lateral aberration diagram of a zoom lens system according to Example I-11 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 34 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-12 (Example I-12).
FIG. 35 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-12.
FIG. 36 is a lateral aberration diagram of a zoom lens system according to Example I-12 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 37 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-13 (Example I-13).
FIG. 38 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-13.
FIG. 39 is a lateral aberration diagram of a zoom lens system according to Example I-13 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 40 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-14 (Example I-14).
FIG. 41 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-14.
FIG. 42 is a lateral aberration diagram of a zoom lens system according to Example I-14 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 43 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-15 (Example I-15).
FIG. 44 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-15.
FIG. 45 is a lateral aberration diagram of a zoom lens system according to Example I-15 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 46 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-16 (Example I-16).
FIG. 47 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-16.
FIG. 48 is a lateral aberration diagram of a zoom lens system according to Example I-16 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 49 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-17 (Example I-17).
FIG. 50 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-17.
FIG. 51 is a lateral aberration diagram of a zoom lens system according to Example I-17 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 52 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-18 (Example I-18).
FIG. 53 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-18.
FIG. 54 is a lateral aberration diagram of a zoom lens system according to Example I-18 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 55 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-19 (Example I-19).
FIG. 56 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-19.
FIG. 57 is a lateral aberration diagram of a zoom lens system according to Example I-19 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 58 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-20 (Example I-20).
FIG. 59 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-20.
FIG. 60 is a lateral aberration diagram of a zoom lens system according to Example I-20 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 61 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-21 (Example I-21).
FIG. 62 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-21.
FIG. 63 is a lateral aberration diagram of a zoom lens system according to Example I-21 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 64 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-22 (Example I-22).
FIG. 65 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-22.
FIG. 66 is a lateral aberration diagram of a zoom lens system according to Example I-22 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 67 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-23 (Example I-23).
FIG. 68 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-23.
FIG. 69 is a lateral aberration diagram of a zoom lens system according to Example I-23 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 70 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment I-24 (Example I-24).
FIG. 71 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example I-24.
FIG. 72 is a lateral aberration diagram of a zoom lens system according to Example I-24 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 73 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment II-1 (Example II-1).
FIG. 74 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example II-1.
FIG. 75 is a lateral aberration diagram of a zoom lens system according to Example II-1 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 76 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment II-2 (Example II-2).
FIG. 77 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example II-2.
FIG. 78 is a lateral aberration diagram of a zoom lens system according to Example II-2 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 79 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment II-3 (Example II-3).
FIG. 80 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example II-3.
FIG. 81 is a lateral aberration diagram of a zoom lens system according to Example II-3 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 82 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment II-4 (Example II-4).
FIG. 83 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example II-4.
FIG. 84 is a lateral aberration diagram of a zoom lens system according to Example II-4 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 85 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment II-5 (Example II-5).
FIG. 86 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example II-5.
FIG. 87 is a lateral aberration diagram of a zoom lens system according to Example II-5 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 88 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment II-6 (Example II-6).
FIG. 89 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example II-6.
FIG. 90 is a lateral aberration diagram of a zoom lens system according to Example II-6 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 91 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment II-7 (Example II-7).
FIG. 92 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example II-7.
FIG. 93 is a lateral aberration diagram of a zoom lens system according to Example II-7 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 94 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment II-8 (Example II-8).
FIG. 95 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example II-8.
FIG. 96 is a lateral aberration diagram of a zoom lens system according to Example II-8 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 97 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment II-9 (Example II-9).
FIG. 98 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example II-9.
FIG. 99 is a lateral aberration diagram of a zoom lens system according to Example II-9 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 100 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment II-10 (Example II-10).
FIG. 101 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example II-10.
FIG. 102 is a lateral aberration diagram of a zoom lens system according to Example II-10 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 103 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment II-11 (Example II-11).
FIG. 104 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example II-11.
FIG. 105 is a lateral aberration diagram of a zoom lens system according to Example II-11 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 106 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment II-12 (Example II-12).
FIG. 107 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example II-12.
FIG. 108 is a lateral aberration diagram of a zoom lens system according to Example II-12 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 109 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment II-13 (Example II-13).
FIG. 110 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example II-13.
FIG. 111 is a lateral aberration diagram of a zoom lens system according to Example II-13 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 112 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment II-14 (Example II-14).
FIG. 113 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example II-14.
FIG. 114 is a lateral aberration diagram of a zoom lens system according to Example II-14 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 115 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment II-15 (Example II-15).
FIG. 116 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example II-15.
FIG. 117 is a lateral aberration diagram of a zoom lens system according to Example II-15 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 118 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment II-16 (Example II-16).
FIG. 119 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example II-16.
FIG. 120 is a lateral aberration diagram of a zoom lens system according to Example II-16 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 121 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment II-17 (Example II-17).
FIG. 122 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example II-17.
FIG. 123 is a lateral aberration diagram of a zoom lens system according to Example II-17 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 124 is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment II-18 (Example II-18).
FIG. 125 is a longitudinal aberration diagram of an infinity in-focus condition of a zoom lens system according to Example II-18.
FIG. 126 is a lateral aberration diagram of a zoom lens system according to Example II-18 at a telephoto limit in a basic state where image blur compensation is not performed and in a blur compensation state.
FIG. 127 is a schematic construction diagram of a digital still camera according to Embodiments I-25 and II-19.



DESCRIPTION OF THE REFERENCE CHARACTERS
G1 First lens unit
G2 Second lens unit
G3 Third lens unit
L1 First lens element
L2 Second lens element
L3 Third lens element
L4 Fourth lens element
L5 Fifth lens element
L6 Sixth lens element
L7 Seventh lens element, Plane parallel plate
L8 Plane parallel plate
L9 Plane parallel plate
A Aperture diaphragm
S Image surface
1 Zoom lens system
2 Image sensor
3 Liquid crystal display monitor
4 Body
5 Main barrel
6 Moving barrel
7 Cylindrical cam
BEST MODE FOR CARRYING OUT THE INVENTION
(Embodiments I-1 to I-24)
FIGS. 1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31, 34, 37, 40, 43, 46, 49, 52, 55, 58, 61, 64, 67 and 70 are lens arrangement diagrams of zoom lens systems according to Embodiments I-1 to I-24, respectively.
Each of FIGS. 1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31, 34, 37, 40, 43, 46, 49, 52, 55, 58, 61, 64, 67 and 70 shows a zoom lens system in an infinity in-focus condition. In each FIG., part (a) shows a lens configuration at a wide-angle limit (in the minimum focal length condition: focal length fW), part (b) shows a lens configuration at a middle position (in an intermediate focal length condition: focal length fM=√{square root over ( )}(fW*fT)), and part (c) shows a lens configuration at a telephoto limit (in the maximum focal length condition: focal length fT). Further, in each FIG., each bent arrow located between part (a) and part (b) indicates a line obtained by connecting the positions of each lens unit respectively at, in order from the upper, a wide-angle limit, a middle position and a telephoto limit. Thus, in the part between the wide-angle limit and the middle position and the part between the middle position and the telephoto limit, the positions are connected simply with a straight line, and hence this line does not indicate actual motion of each lens unit. Moreover, in each FIG., an arrow imparted to a lens unit indicates focusing from an infinity in-focus condition to a close-object in-focus condition. That is, the arrow indicates the moving direction at the time of focusing from an infinity in-focus condition to a close-object in-focus condition.
The zoom lens system according to each embodiment, in order from the object side to the image side, comprises a first lens unit G1 having negative optical power, a second lens unit G2 having positive optical power and a third lens unit G3 having positive optical power. Then, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units move along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase (this lens configuration is referred to as the basic configuration I of the embodiment, hereinafter). In the zoom lens system according to each embodiment, when these lens units are arranged in a desired optical power configuration, high optical performance is obtained and still size reduction is achieved in the entire lens system.
Further, in FIGS. 1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31, 34, 37, 40, 43, 46, 49, 52, 55, 58, 61, 64, 67 and 70, an asterisk * imparted to a particular surface indicates that the surface is aspheric. In each FIG., symbol (+) or (−) imparted to the symbol of each lens unit corresponds to the sign of the optical power of the lens unit. In each FIG., the straight line located on the most right-hand side indicates the position of the image surface S. On the object side relative to the image surface S (that is, between the image surface S and the most image side lens surface of the third lens unit G3), a plane parallel plate such as an optical low-pass filter and a face plate of an image sensor is provided.
Moreover, in FIGS. 1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31, 34, 37, 40, 43, 46, 49, 52, 55, 58, 61, 64, 67 and 70, an aperture diaphragm A is provided on the image side relative to the second lens unit G2 (that is, between the most image side lens surface of the second lens unit G2 and the most object side lens surface of the third lens unit G3). In zooming from a wide-angle limit to a telephoto limit during image taking, the aperture diaphragm A moves along the optical axis integrally with the second lens unit G2. As such, in the zoom lens system according to each embodiment, on the image side relative to the second lens unit G2, the aperture diaphragm A is arranged that moves along the optical axis integrally with the second lens unit G2 during zooming from a wide-angle limit to a telephoto limit in image taking. This permits length reduction in the air space between the first lens unit G1 and the second lens unit G2. As a result, in spite of being a three-unit construction of negative lead type, a reduced overall optical length and a variable magnification ratio as high as approximately 5 are achieved simultaneously.
As shown in FIG. 1, in the zoom lens system according to Embodiment I-1, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment I-1, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a bi-convex sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment I-1, the third lens unit G3 comprises solely a positive meniscus seventh lens element L7 with the convex surface facing the image side. The seventh lens element L7 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-1, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 4, in the zoom lens system according to Embodiment I-2, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has an aspheric image side surface, while the second lens element L2 has an aspheric object side surface.
In the zoom lens system of Embodiment I-2, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a positive meniscus sixth lens element L6 with the convex surface facing the object side. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the sixth lens element L6 has two aspheric surfaces.
Further, in the zoom lens system of Embodiment I-2, the third lens unit G3 comprises solely a bi-convex seventh lens element L7. The seventh lens element L7 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-2, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 7, in the zoom lens system according to Embodiment I-3, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment I-3, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a bi-convex sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment I-3, the third lens unit G3 comprises solely a positive meniscus seventh lens element L7 with the convex surface facing the image side. The seventh lens element L7 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-3, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 10, in the zoom lens system according to Embodiment I-4, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment I-4, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a bi-convex sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment I-4, the third lens unit G3 comprises solely a positive meniscus seventh lens element L7 with the convex surface facing the image side. The seventh lens element L7 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-4, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 13, in the zoom lens system according to Embodiment I-5, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment I-5, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a bi-convex sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment I-5, the third lens unit G3 comprises solely a positive meniscus seventh lens element L7 with the convex surface facing the image side. The seventh lens element L7 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-5, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 16, in the zoom lens system according to Embodiment I-6, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has an aspheric image side surface, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment I-6, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a bi-convex sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment I-6, the third lens unit G3 comprises solely a positive meniscus seventh lens element L7 with the convex surface facing the image side. The seventh lens element L7 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-6, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 19, in the zoom lens system according to Embodiment I-7, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment I-7, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a bi-convex sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment I-7, the third lens unit G3 comprises solely a positive meniscus seventh lens element L7 with the convex surface facing the image side. The seventh lens element L7 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-7, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 22, in the zoom lens system according to Embodiment I-8, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment I-8, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a bi-convex sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment I-8, the third lens unit G3 comprises solely a positive meniscus seventh lens element L7 with the convex surface facing the image side. The seventh lens element L7 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-8, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 25, in the zoom lens system according to Embodiment I-9, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces.
Further, in the zoom lens system according to Embodiment I-9, the second lens unit G2, in order from the object side to the image side, comprises: a bi-convex third lens element L3; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a bi-convex sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens element L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment I-9, the third lens unit G3 comprises solely a positive meniscus seventh lens element L7 with the convex surface facing the image side. The seventh lens element L7 has an aspheric image side surface.
In the zoom lens system according to Embodiment I-9, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 28, in the zoom lens system according to Embodiment I-10, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment I-10, the second lens unit G2, in order from the object side to the image side, comprises: a bi-convex third lens element L3; a bi-concave fourth lens element L4; and a bi-convex fifth lens element L5. Among these, the third lens element L3 and the fourth lens element L4 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 6 indicates the cement layer between the third lens element L3 and the fourth lens element L4. Further, the third lens element L3 has an aspheric object side surface.
Further, in the zoom lens system of Embodiment I-10, the third lens unit G3 comprises solely a bi-convex sixth lens element L6. The sixth lens element L6 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-10, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 31, in the zoom lens system according to Embodiment I-11, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment I-11, the second lens unit G2, in order from the object side to the image side, comprises: a bi-convex third lens element L3; a bi-concave fourth lens element L4; and a bi-convex fifth lens element L5. Among these, the third lens element L3 and the fourth lens element L4 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 6 indicates the cement layer between the third lens element L3 and the fourth lens element L4. Further, the third lens element L3 has an aspheric object side surface.
Further, in the zoom lens system of Embodiment I-11, the third lens unit G3 comprises solely a bi-convex sixth lens element L6. The sixth lens element L6 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-11, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 34, in the zoom lens system according to Embodiment I-12, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has an aspheric image side surface, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment I-12, the second lens unit G2, in order from the object side to the image side, comprises: a bi-convex third lens element L3; a bi-concave fourth lens element L4; and a bi-convex fifth lens element L5. Among these, the third lens element L3 and the fourth lens element L4 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 6 indicates the cement layer between the third lens element L3 and the fourth lens element L4. Further, the third lens element L3 has an aspheric object side surface.
Further, in the zoom lens system of Embodiment I-12, the third lens unit G3 comprises solely a bi-convex sixth lens element L6. The sixth lens element L6 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-12, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 37, in the zoom lens system according to Embodiment I-13, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment I-13, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a negative meniscus fourth lens element L4 with the convex surface facing the object side; and a bi-convex fifth lens element L5. Among these, the third lens element L3 and the fourth lens element L4 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 6 indicates the cement layer between the third lens element L3 and the fourth lens element L4. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment I-13, the third lens unit G3 comprises solely a positive meniscus sixth lens element L6 with the convex surface facing the image side. The sixth lens element L6 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-13, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 40, in the zoom lens system according to Embodiment I-14, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has an aspheric image side surface, while the second lens element L2 has an aspheric object side surface.
In the zoom lens system of Embodiment I-14, the second lens unit G2, in order from the object side to the image side, comprises: a bi-convex third lens element L3; a bi-convex fourth lens element L4; and a bi-concave fifth lens element L5. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Further, in the zoom lens system of Embodiment I-14, the third lens unit G3 comprises solely a positive meniscus sixth lens element L6 with the convex surface facing the image side. The sixth lens element L6 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-14, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 43, in the zoom lens system according to Embodiment I-15, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has an aspheric image side surface, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment I-15, the second lens unit G2, in order from the object side to the image side, comprises: a bi-convex third lens element L3; a bi-convex fourth lens element L4; and a bi-concave fifth lens element L5. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens element L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment I-15, the third lens unit G3 comprises solely a positive meniscus sixth lens element L6 with the convex surface facing the image side. The sixth lens element L6 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-15, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 46, in the zoom lens system according to Embodiment I-16, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has an aspheric image side surface, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment I-16, the second lens unit G2, in order from the object side to the image side, comprises: a bi-convex third lens element L3; a bi-convex fourth lens element L4; and a bi-concave fifth lens element L5. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens element L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment I-16, the third lens unit G3 comprises solely a positive meniscus sixth lens element L6 with the convex surface facing the image side. The sixth lens element L6 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-16, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 49, in the zoom lens system according to Embodiment I-17, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has an aspheric image side surface, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment I-17, the second lens unit G2, in order from the object side to the image side, comprises: a bi-convex third lens element L3; a bi-concave fourth lens element L4; and a bi-convex fifth lens element L5. Among these, the third lens element L3 and the fourth lens element L4 are cemented with each other. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment I-17, the third lens unit G3 comprises solely a positive meniscus sixth lens element L6 with the convex surface facing the image side. The sixth lens element L6 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-17, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 52, in the zoom lens system according to Embodiment I-18, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has an aspheric image side surface, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment I-18, the second lens unit G2, in order from the object side to the image side, comprises: a bi-convex third lens element L3; a bi-concave fourth lens element L4; and a bi-convex fifth lens element L5. Among these, the third lens element L3 and the fourth lens element L4 are cemented with each other. Further, the third lens element L3 has an aspheric object side surface.
Further, in the zoom lens system of Embodiment I-18, the third lens unit G3 comprises solely a bi-convex sixth lens element L6. The sixth lens element L6 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-18, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 55, in the zoom lens system according to Embodiment I-19, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has an aspheric image side surface, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment I-19, the second lens unit G2, in order from the object side to the image side, comprises: a bi-convex third lens element L3; a bi-concave fourth lens element L4; and a bi-convex fifth lens element L5. Among these, the third lens element L3 and the fourth lens element L4 are cemented with each other. Further, the third lens element L3 has an aspheric object side surface.
Further, in the zoom lens system of Embodiment I-19, the third lens unit G3 comprises solely a bi-convex sixth lens element L6. The sixth lens element L6 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-19, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 58, in the zoom lens system according to Embodiment I-20, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-20, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a negative meniscus fourth lens element L4 with the convex surface facing the object side; a negative meniscus fifth lens element L5 with the convex surface facing the object side; and a bi-convex sixth lens element L6. Among these, the third lens element L3 and the fourth lens element L4 are cemented with each other, while the fifth lens element L5 and the sixth lens element L6 are cemented with each other. Further, the third lens element L3 has an aspheric object side surface.
Further, in the zoom lens system of Embodiment I-20, the third lens unit G3 comprises solely a bi-convex seventh lens element L7.
In the zoom lens system according to Embodiment I-20, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 61, in the zoom lens system according to Embodiment I-21, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-21, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a negative meniscus fourth lens element L4 with the convex surface facing the object side; a negative meniscus fifth lens element L5 with the convex surface facing the object side; and a bi-convex sixth lens element L6. Among these, the third lens element L3 and the fourth lens element L4 are cemented with each other, while the fifth lens element L5 and the sixth lens element L6 are cemented with each other. Further, the third lens element L3 has an aspheric object side surface.
Further, in the zoom lens system of Embodiment I-21, the third lens unit G3 comprises solely a bi-convex seventh lens element L7.
In the zoom lens system according to Embodiment I-21, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 64, in the zoom lens system according to Embodiment I-22, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-22, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a negative meniscus fourth lens element L4 with the convex surface facing the object side; a negative meniscus fifth lens element L5 with the convex surface facing the object side; and a bi-convex sixth lens element L6. Among these, the third lens element L3 and the fourth lens element L4 are cemented with each other, while the fifth lens element L5 and the sixth lens element L6 are cemented with each other. Further, the third lens element L3 has an aspheric object side surface.
Further, in the zoom lens system of Embodiment I-22, the third lens unit G3 comprises solely a bi-convex seventh lens element L7.
In the zoom lens system according to Embodiment I-22, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 67, in the zoom lens system according to Embodiment I-23, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces.
In the zoom lens system according to Embodiment I-23, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a negative meniscus fourth lens element L4 with the convex surface facing the object side; a negative meniscus fifth lens element L5 with the convex surface facing the object side; and a bi-convex sixth lens element L6. Among these, the third lens element L3 and the fourth lens element L4 are cemented with each other, while the fifth lens element L5 and the sixth lens element L6 are cemented with each other. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment I-23, the third lens unit G3 comprises solely a positive meniscus seventh lens element L7 with the convex surface facing the image side.
In the zoom lens system according to Embodiment I-23, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 70, in the zoom lens system according to Embodiment I-24, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces.
Further, in the zoom lens system according to Embodiment I-24, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a negative meniscus fourth lens element L4 with the convex surface facing the object side; a negative meniscus fifth lens element L5 with the convex surface facing the object side; and a bi-convex sixth lens element L6. Among these, the third lens element L3 and the fourth lens element L4 are cemented with each other, while the fifth lens element L5 and the sixth lens element L6 are cemented with each other. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment I-24, the third lens unit G3 comprises solely a bi-convex seventh lens element L7.
In the zoom lens system according to Embodiment I-24, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
In particular, in the zoom lens systems according to Embodiments I-1 to I-24, the first lens unit G1, in order from the object side to the image side, comprises: a first lens element having negative optical power; and a second lens element having positive optical power, and the second lens element is a meniscus lens element with the convex surface facing the object side. By virtue of this, a reduced overall optical length can be realized in a state that various kinds of aberration, especially, distortion at a wide-angle limit, are compensated satisfactorily.
In the zoom lens system according to Embodiments I-1 to I-24, the first lens unit G1 includes at least one lens element having an aspheric surface, or alternatively includes at least two aspheric surfaces. By virtue of this, aberration is compensated more successfully.
In the zoom lens system according to Embodiments I-1 to I-24, the third lens unit G3 is composed of one lens element. Accordingly, the total number of lens elements is reduced, and so is the overall optical length in the lens system. Further, according to embodiments where the one lens element constituting the third lens unit G3 includes an aspheric surface, aberration is compensated more successfully.
In the zoom lens system according to Embodiments I-1 to I-24, the second lens unit G2 is constructed from three or four lens elements that include one or two sets of cemented lens elements. By virtue of this, the second lens unit G2 has a reduced thickness, and a reduced overall optical length is realized in the lens system.
Further, in the zoom lens system according to Embodiments I-1 to I-24, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1, the second lens unit G2 and the third lens unit G3 are moved individually along the optical axis so that magnification change is achieved. Here, among these lens units, for example, the second lens unit G2 is moved in a direction perpendicular to the optical axis, so that image blur caused by hand bluffing, vibration and the like can be compensated optically.
When the image blur is to be compensated optically, the second lens unit G2 is moved in a direction perpendicular to the optical axis as described above, so that image blur is compensated in a state that size increase in the entire zoom lens system is suppressed and a compact construction is realized and that excellent imaging characteristics such as small decentering coma aberration and small decentering astigmatism are satisfied.
(Embodiments II-1 to II-18)
FIGS. 73, 76, 79, 82, 85, 88, 91, 94, 97, 100, 103, 106, 109, 112, 115, 118, 121 and 124 are lens arrangement diagrams of zoom lens systems according to Embodiments II-1 to II-18, respectively.
Each of FIGS. 73, 76, 79, 82, 85, 88, 91, 94, 97, 100, 103, 106, 109, 112, 115, 118, 121 and 124 shows a zoom lens system in an infinity in-focus condition. In each FIG., part (a) shows a lens configuration at a wide-angle limit (in the minimum focal length condition: focal length fW), part (b) shows a lens configuration at a middle position (in an intermediate focal length condition: focal length fM=√{square root over ( )}(fW*fT)), and part (c) shows a lens configuration at a telephoto limit (in the maximum focal length condition: focal length fT). Further, in each FIG., each bent arrow located between part (a) and part (b) indicates a line obtained by connecting the positions of each lens unit respectively at, in order from the upper, a wide-angle limit, a middle position and a telephoto limit. Thus, in the part between the wide-angle limit and the middle position and the part between the middle position and the telephoto limit, the positions are connected simply with a straight line, and hence this line does not indicate actual motion of each lens unit. Moreover, in each FIG., an arrow imparted to a lens unit indicates focusing from an infinity in-focus condition to a close-object in-focus condition. That is, the arrow indicates the moving direction at the time of focusing from an infinity in-focus condition to a close-object in-focus condition.
The zoom lens system according to each embodiment, in order from the object side to the image side, comprises a first lens unit G1 having negative optical power, a second lens unit G2 having positive optical power and a third lens unit G3 having positive optical power. Then, in zooming from a wide-angle limit to a telephoto limit during image taking, at least the first lens unit G1 and the second lens unit G2 move along the optical axis (this lens configuration is referred to as the basic configuration II of the embodiment, hereinafter). In the zoom lens system according to each embodiment, when these lens units are arranged in a desired optical power configuration, high optical performance is obtained and still size reduction is achieved in the entire lens system.
Further, in FIGS. 73, 76, 79, 82, 85, 88, 91, 94, 97, 100, 103, 106, 109, 112, 115, 118, 121 and 124, an asterisk * imparted to a particular surface indicates that the surface is aspheric. In each FIG., symbol (+) or (−) imparted to the symbol of each lens unit corresponds to the sign of the optical power of the lens unit. In each FIG., the straight line located on the most right-hand side indicates the position of the image surface S. On the object side relative to the image surface S (that is, between the image surface S and the most image side lens surface of the third lens unit G3), a plane parallel plate such as an optical low-pass filter and a face plate of an image sensor is provided.
Moreover, in FIGS. 73, 76, 79, 82, 85, 88, 91, 94, 97, 100, 103, 106, 109, 112, 115, 118, 121 and 124, an aperture diaphragm A is provided on the image side relative to the second lens unit G2 (that is, between the most image side lens surface of the second lens unit G2 and the most object side lens surface of the third lens unit G3). In zooming from a wide-angle limit to a telephoto limit during image taking, the aperture diaphragm A moves along the optical axis integrally with the second lens unit G2. As such, in the zoom lens system according to each embodiment, on the image side relative to the second lens unit G2, the aperture diaphragm A is arranged that moves along the optical axis integrally with the second lens unit G2 during zooming from a wide-angle limit to a telephoto limit in image taking. This permits length reduction in the air space between the first lens unit G1 and the second lens unit G2. As a result, in spite of being a three-unit construction of negative lead type, a reduced overall optical length and a variable magnification ratio as high as approximately 5 are achieved simultaneously.
As shown in FIG. 73, in the zoom lens system according to Embodiment II-1, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment II-1, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a bi-convex sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment II-1, the third lens unit G3 comprises solely a positive meniscus seventh lens element L7 with the convex surface facing the image side. The seventh lens element L7 has two aspheric surfaces.
In the zoom lens system according to Embodiment II-1, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 76, in the zoom lens system according to Embodiment II-2, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has an aspheric image side surface, while the second lens element L2 has an aspheric object side surface.
In the zoom lens system of Embodiment II-2, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a positive meniscus sixth lens element L6 with the convex surface facing the object side. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the sixth lens element L6 has two aspheric surfaces.
Further, in the zoom lens system of Embodiment II-2, the third lens unit G3 comprises solely a bi-convex seventh lens element L7. The seventh lens element L7 has two aspheric surfaces.
In the zoom lens system according to Embodiment II-2, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 79, in the zoom lens system according to Embodiment II-3, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment II-3, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a bi-convex sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment II-3, the third lens unit G3 comprises solely a positive meniscus seventh lens element L7 with the convex surface facing the image side. The seventh lens element L7 has two aspheric surfaces.
In the zoom lens system according to Embodiment II-3, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 82, in the zoom lens system according to Embodiment II-4, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment II-4, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a bi-convex sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment II-4, the third lens unit G3 comprises solely a positive meniscus seventh lens element L7 with the convex surface facing the image side. The seventh lens element L7 has two aspheric surfaces.
In the zoom lens system according to Embodiment II-4, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 85, in the zoom lens system according to Embodiment II-5, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment II-5, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a bi-convex sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment II-5, the third lens unit G3 comprises solely a positive meniscus seventh lens element L7 with the convex surface facing the image side. The seventh lens element L7 has two aspheric surfaces.
In the zoom lens system according to Embodiment II-5, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 88, in the zoom lens system according to Embodiment II-6, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment II-6, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a bi-convex sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment II-6, the third lens unit G3 comprises solely a positive meniscus seventh lens element L7 with the convex surface facing the image side. The seventh lens element L7 has two aspheric surfaces.
In the zoom lens system according to Embodiment II-6, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 91, in the zoom lens system according to Embodiment II-7, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has an aspheric image side surface, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment II-7, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a bi-convex sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment II-7, the third lens unit G3 comprises solely a positive meniscus seventh lens element L7 with the convex surface facing the image side. The seventh lens element L7 has two aspheric surfaces.
In the zoom lens system according to Embodiment II-7, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 94, in the zoom lens system according to Embodiment II-8, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment II-8, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a bi-convex sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment II-8, the third lens unit G3 comprises solely a positive meniscus seventh lens element L7 with the convex surface facing the image side. The seventh lens element L7 has two aspheric surfaces.
In the zoom lens system according to Embodiment II-8, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 97, in the zoom lens system according to Embodiment II-9, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment II-9, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a bi-convex sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment II-9, the third lens unit G3 comprises solely a positive meniscus seventh lens element L7 with the convex surface facing the image side. The seventh lens element L7 has two aspheric surfaces.
In the zoom lens system according to Embodiment II-9, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 100, in the zoom lens system according to Embodiment II-10, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces.
Further, in the zoom lens system according to Embodiment II-10, the second lens unit G2, in order from the object side to the image side, comprises: a bi-convex third lens element L3; a bi-convex fourth lens element L4; a bi-concave fifth lens element L5; and a bi-convex sixth lens element L6. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens element L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment II-10, the third lens unit G3 comprises solely a positive meniscus seventh lens element L7 with the convex surface facing the image side. The seventh lens element L7 has an aspheric image side surface.
In the zoom lens system according to Embodiment II-10, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 103, in the zoom lens system according to Embodiment II-11, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment II-11, the second lens unit G2, in order from the object side to the image side, comprises: a bi-convex third lens element L3; a bi-concave fourth lens element L4; and a bi-convex fifth lens element L5. Among these, the third lens element L3 and the fourth lens element L4 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 6 indicates the cement layer between the third lens element L3 and the fourth lens element L4. Further, the third lens element L3 has an aspheric object side surface.
Further, in the zoom lens system of Embodiment II-11, the third lens unit G3 comprises solely a bi-convex sixth lens element L6. The sixth lens element L6 has two aspheric surfaces.
In the zoom lens system according to Embodiment II-11, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 106, in the zoom lens system according to Embodiment II-12, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment II-12, the second lens unit G2, in order from the object side to the image side, comprises: a bi-convex third lens element L3; a bi-concave fourth lens element L4; and a bi-convex fifth lens element L5. Among these, the third lens element L3 and the fourth lens element L4 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 6 indicates the cement layer between the third lens element L3 and the fourth lens element L4. Further, the third lens element L3 has an aspheric object side surface.
Further, in the zoom lens system of Embodiment II-12, the third lens unit G3 comprises solely a bi-convex sixth lens element L6. The sixth lens element L6 has two aspheric surfaces.
In the zoom lens system according to Embodiment II-12, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 109, in the zoom lens system according to Embodiment II-13, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has an aspheric image side surface, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment II-13, the second lens unit G2, in order from the object side to the image side, comprises: a bi-convex third lens element L3; a bi-concave fourth lens element L4; and a bi-convex fifth lens element L5. Among these, the third lens element L3 and the fourth lens element L4 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 6 indicates the cement layer between the third lens element L3 and the fourth lens element L4. Further, the third lens element L3 has an aspheric object side surface.
Further, in the zoom lens system of Embodiment II-13, the third lens unit G3 comprises solely a bi-convex sixth lens element L6. The sixth lens element L6 has two aspheric surfaces.
In the zoom lens system according to Embodiment II-13, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 112, in the zoom lens system according to Embodiment II-14, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has two aspheric surfaces, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment II-14, the second lens unit G2, in order from the object side to the image side, comprises: a positive meniscus third lens element L3 with the convex surface facing the object side; a negative meniscus fourth lens element L4 with the convex surface facing the object side; and a bi-convex fifth lens element L5. Among these, the third lens element L3 and the fourth lens element L4 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 6 indicates the cement layer between the third lens element L3 and the fourth lens element L4. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment II-14, the third lens unit G3 comprises solely a positive meniscus sixth lens element L6 with the convex surface facing the image side. The sixth lens element L6 has two aspheric surfaces.
In the zoom lens system according to Embodiment II-14, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 115, in the zoom lens system according to Embodiment II-15, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has an aspheric image side surface, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment II-15, the second lens unit G2, in order from the object side to the image side, comprises: a bi-convex third lens element L3; a bi-convex fourth lens element L4; and a bi-concave fifth lens element L5. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens element L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment II-15, the third lens unit G3 comprises solely a positive meniscus sixth lens element L6 with the convex surface facing the image side. The sixth lens element L6 has two aspheric surfaces.
In the zoom lens system according to Embodiment II-15, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 118, in the zoom lens system according to Embodiment II-16, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has an aspheric image side surface, while the second lens element L2 has an aspheric object side surface.
In the zoom lens system of Embodiment II-16, the second lens unit G2, in order from the object side to the image side, comprises: a bi-convex third lens element L3; a bi-convex fourth lens element L4; and a bi-concave fifth lens element L5. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens elements L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Further, in the zoom lens system of Embodiment II-16, the third lens unit G3 comprises solely a positive meniscus sixth lens element L6 with the convex surface facing the image side. The sixth lens element L6 has two aspheric surfaces.
In the zoom lens system according to Embodiment II-16, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 121, in the zoom lens system according to Embodiment II-17, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has an aspheric image side surface, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment II-17, the second lens unit G2, in order from the object side to the image side, comprises: a bi-convex third lens element L3; a bi-convex fourth lens element L4; and a bi-concave fifth lens element L5. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens element L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment II-17, the third lens unit G3 comprises solely a positive meniscus sixth lens element L6 with the convex surface facing the image side. The sixth lens element L6 has two aspheric surfaces.
In the zoom lens system according to Embodiment II-17, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
As shown in FIG. 124, in the zoom lens system according to Embodiment II-18, the first lens unit G1, in order from the object side to the image side, comprises: a negative meniscus first lens element L1 with the convex surface facing the object side; and a positive meniscus second lens element L2 with the convex surface facing the object side. The first lens element L1 has an aspheric image side surface, while the second lens element L2 has an aspheric object side surface.
Further, in the zoom lens system according to Embodiment II-18, the second lens unit G2, in order from the object side to the image side, comprises: a bi-convex third lens element L3; a bi-convex fourth lens element L4; and a bi-concave fifth lens element L5. Among these, the fourth lens element L4 and the fifth lens element L5 are cemented with each other. In the surface data in the corresponding numerical example described later, surface number 8 indicates the cement layer between the fourth lens element L4 and the fifth lens element L5. Further, the third lens element L3 has an aspheric object side surface.
Moreover, in the zoom lens system according to Embodiment II-18, the third lens unit G3 comprises solely a positive meniscus sixth lens element L6 with the convex surface facing the image side. The sixth lens element L6 has two aspheric surfaces.
In the zoom lens system according to Embodiment II-18, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1 moves to the object side with locus of a convex to the image side. Further, the second lens unit G2 moves to the object side together with the aperture diaphragm A, while the third lens unit G3 moves to the image side. That is, in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along the optical axis such that the interval between the first lens unit G1 and the second lens unit G2 should decrease and that the interval between the second lens unit G2 and the third lens unit G3 should increase.
In particular, in the zoom lens systems according to Embodiments II-1 to II-18, the first lens unit G1, in order from the object side to the image side, comprises: a lens element having negative optical power; and a meniscus lens element having positive optical power with the convex surface facing the object side. By virtue of this, a reduced overall optical length can be realized in a state that various kinds of aberration, especially, distortion at a wide-angle limit, are compensated satisfactorily.
In the zoom lens system according to Embodiments II-1 to II-18, the first lens unit G1 includes at least one lens element having an aspheric surface, or alternatively includes at least two aspheric surfaces. By virtue of this, aberration is compensated more successfully.
In the zoom lens system according to Embodiments II-1 to II-18, the third lens unit G3 is composed of one lens element. Accordingly, the total number of lens elements is reduced, and so is the overall optical length in the lens system. Further, according to embodiments where the one lens element constituting the third lens unit G3 includes an aspheric surface, aberration is compensated more successfully.
In the zoom lens system according to Embodiments II-1 to II-18, the second lens unit G2 is constructed from three or four lens elements that include one or two sets of cemented lens elements. By virtue of this, the second lens unit G2 has a reduced thickness, and a reduced overall optical length is realized in the lens system.
Further, in the zoom lens system according to Embodiments II-1 to II-18, in zooming from a wide-angle limit to a telephoto limit during image taking, the first lens unit G1, the second lens unit G2 and the third lens unit G3 are moved individually along the optical axis so that magnification change is achieved. Here, among these lens units, for example, the second lens unit G2 is moved in a direction perpendicular to the optical axis, so that image blur caused by hand bluffing, vibration and the like can be compensated optically.
When the image blur is to be compensated optically, the second lens unit G2 is moved in a direction perpendicular to the optical axis as described above, so that image blur is compensated in a state that size increase in the entire zoom lens system is suppressed and a compact construction is realized and that excellent imaging characteristics such as small decentering coma aberration and small decentering astigmatism are satisfied.
Conditions are described below that are preferable to be satisfied by a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 which has the above-mentioned basic configuration I and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18 which has the above-mentioned basic configuration II. Here, a plurality of preferable conditions are set forth for the zoom lens system according to each embodiment. A construction that satisfies all the plural conditions is most desirable for the zoom lens system. However, when an individual condition is satisfied, a zoom lens system having the corresponding effect can be obtained.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24, wherein the first lens unit is, in order from the object side to the image side, composed of a first lens element having negative optical power and a second lens element having positive optical power, the following condition (26) is satisfied. For example, in a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, in a case that the first lens unit, in order from the object side to the image side, comprises a first lens element having negative optical power and a second lens element having positive optical power, it is preferable that the following condition (26) is satisfied.

0.50<fL2/fT<1.00  (26)

(here, Z=fT/fW>4.0 and ωW>35)
where,
fL2 is a focal length of the second lens element,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
The condition (26) sets forth the focal length of the second lens element of the first lens unit. When the value exceeds the upper limit of the condition (26), the focal length of the second lens element becomes excessively large, and hence the negative optical power of the entire first lens unit becomes small. This can cause difficulty in compensating various kinds of aberration, especially distortion, in a state that the focal length is reduced at a wide-angle limit. Further, when the value exceeds the upper limit of the condition (26), magnification chromatic aberration can be generated remarkably. In contrast, when the value goes below the lower limit of the condition (26), the focal length of the second lens element becomes excessively small. This can cause difficulty in ensuring a variable magnification ratio as high as 4 or greater in a state that satisfactory optical performance is obtained. Further, compensation of distortion can become insufficient.
When the following condition (26)′ is satisfied, the above-mentioned effect is achieved more successfully.

fL2/fT<0.90  (26)′

(here, Z=fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (26) and (26)′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, wherein the second lens unit has a positive lens element on the most object side, the following condition (27) is satisfied. For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24, in a case that the second lens unit has a positive lens element on the most object side, it is preferable that the following condition (27) is satisfied.

0.40<fL3/fG2<1.00  (27)

where,
fL3 is a focal length of the positive lens element arranged on the most object side of the second lens unit, and
fG2 is a focal length of the second lens unit.
The condition (27) sets forth the positive lens element arranged on the most object side of the second lens unit. When the value exceeds the upper limit of the condition (27), difficulty can arise in compensating distortion at a wide-angle limit. In contrast, when the value goes below the lower limit of the condition (27), difficulty arises in compensating spherical aberration over the entire zoom range, and hence size reduction and optical performance cannot simultaneously be achieved. This causes a possibility of degradation in the basic imaging performance as an optical system.
When the following condition (27)′ is satisfied, the above-mentioned effect is achieved more successfully.

fL3/fG2<0.92  (27)′

For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (1) is satisfied.

0.10<D2/(Ir×Z2)<0.30  (1)

(here, Z=fT/fW>4.0 and ωW>35)
where,
D2 is an amount of movement of the second lens unit in a direction from a telephoto limit to a wide-angle limit (defined as positive for the motion from the image side to the object side),
Ir is a maximum image height (Ir=fT×tan(ωT)),
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit,
ωW is a half value (°) of a maximum view angle at a wide-angle limit, and
ωT is a half value (°) of a maximum view angle at a telephoto limit.
The condition (1) relates to the amount of movement of the second lens unit. When the value exceeds the upper limit of the condition (1), the amount of movement of the second lens unit necessary in association with zooming increases. This can cause difficulty in compensating aberration fluctuation during zooming. In contrast, when the value goes below the lower limit of the condition (1), difficulty can arise in simultaneously compensating distortion and curvature of field especially at a wide-angle limit.
Here, when at least one of the following conditions (1)′ and (1)′′ is satisfied, the above-mentioned effect is achieved more successfully.

0.15<D2/(Ir×Z2)  (1)′

D2/(Ir×Z2)<0.25  (1)′′

(here, Z=fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (1), (1)′ and (1)′′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, in which the second lens unit moves in a direction perpendicular to the optical axis, it is preferable that the entire system satisfies the following conditions (2) and (3).

YT>Y  (2)

0.05<(Y/YT)/(fT/f)<0.60  (3)

(here, Z=fT/fW>4.0 and ωW>35)
where,
f is a focal length of the entire system,
fT is a focal length of the entire system at a telephoto limit,
Y is an amount of movement in a direction perpendicular to the optical axis at the time of maximum blur compensation in the second lens unit with a focal length f of the entire system,
YT is an amount of movement in a direction perpendicular to the optical axis at the time of maximum blur compensation in the second lens unit with a focal length fT of the entire system at a telephoto limit,
f W is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
The conditions (2) and (3) relate to the amount of movement at the time of maximum blur compensation in the second lens unit that moves in a direction perpendicular to the optical axis. In the case of a zoom lens system, when the compensation angle is constant over the entire zoom range, a larger zoom ratio requires a larger amount of movement of the lens unit or the lens element that moves in a direction perpendicular to the optical axis. On the contrary, a smaller zoom ratio requires merely a smaller amount of movement of the lens unit or the lens element that moves in a direction perpendicular to the optical axis. When the condition (2) is not satisfied, alternatively when the value exceeds the upper limit of the condition (3), blur compensation becomes excessive. This causes a possibility of enhanced degradation in the optical performance. In contrast, when the value goes below the lower limit of the condition (3), a possibility of insufficient blur compensation arises.
Here, when at least one of the following conditions (3)′ and (3)′′ is satisfied, the above-mentioned effect is achieved more successfully.

0.08<(Y/YT)/(fT/f)  (3)′

(Y/YT)/(fT/f)<0.50  (3)′′

(here, Z =fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (3), (3)′ and (3)′′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (4) is satisfied.

0.10<(D2T−D2W)/(Ir×Z2)<0.30  (4)

(here, Z=fT/fW>4.0 and ωW>35)
where,
D2T is an axial interval from the most image side of the second lens unit to the most object side of the third lens unit at a telephoto limit,
D2W is an axial interval from the most image side of the second lens unit to the most object side of the third lens unit at a wide-angle limit,
Ir is a maximum image height (Ir=fT×tan(ωT)),
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit,
ωW is a half value (°) of the maximum view angle at a wide-angle limit, and
ωT is a half value (°) of a maximum view angle at a telephoto limit.
The condition (4) relates to the amount of movement of the second lens unit. When the value exceeds the upper limit of the condition (4), the amount of movement of the second lens unit necessary in association with zooming increases. This can cause difficulty in compensating aberration fluctuation during zooming. In contrast, when the value goes below the lower limit of the condition (4), difficulty can arise in simultaneously compensating distortion and curvature of field especially at a wide-angle limit.
Here, when at least one of the following conditions (4)′ and (4)′′ is satisfied, the above-mentioned effect is achieved more successfully.

0.15<(D2T−D2W)/(Ir×Z2)  (4)′

(D2T−D2W)/(Ir×Z2)<0.27  (4)′′

(here, Z=fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (4), (4)′ and (4)′′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (5) is satisfied.

−1.60<fG1/fG2<−0.90  (5)

where,
fG1 is a focal length of the first lens unit, and
fG2 is a focal length of the second lens unit.
The condition (5) sets forth the ratio of the focal lengths of the first lens unit and the second lens unit. When the value exceeds the upper limit of the condition (5), the focal length of the second lens unit becomes excessively small relatively. This can cause difficulty in compensating aberration generated in the second lens unit. In contrast, when the value goes below the lower limit of the condition (5), the focal length of the first lens unit becomes excessively small relatively. This causes difficulty in maintaining the variable magnification function of the second lens unit, and hence can cause difficulty in constructing a zoom lens system having a zoom ratio exceeding 4 in a state that satisfactory optical performance is obtained.
Here, when at least one of the following conditions (5)′ and (5)′′ is satisfied, the above-mentioned effect is achieved more successfully.

−1.50<fG1/fG2  (5)′

fG1/fG2<−1.00  (5)′′

For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (6) is satisfied.

−0.80<fG1/fG3<−0.20  (6)

where,
fG1 is a focal length of the first lens unit, and
fG3 is a focal length of the third lens unit.
The condition (6) sets forth the ratio of the focal lengths of the first lens unit and the third lens unit. When the value exceeds the upper limit of the condition (6), the focal length of the first lens unit becomes excessively large relatively. This can cause difficulty in achieving a compact zoom lens system. In contrast, when the value goes below the lower limit of the condition (6), the focal length of the third lens unit becomes excessively large relatively. This can cause difficulty in ensuring satisfactory illuminance on the image surface.
Here, when at least one of the following conditions (6)′ and (6)′′ is satisfied, the above-mentioned effect is achieved more successfully.

−0.70<fG1/fG3  (6)′

fG1/fG3<−0.50  (6)′′

For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (7) is satisfied.

0.20<fG2/fG3<0.80  (7)

where,
fG2 is a focal length of the second lens unit, and
fG3 is a focal length of the third lens unit.
The condition (7) sets forth the ratio of the focal lengths of the second lens unit and the third lens unit. When the value exceeds the upper limit of the condition (7), the focal length of the second lens unit becomes excessively large relatively. This can cause difficulty in compensating aberration fluctuation generated in the second lens unit in association with zooming. In contrast, when the value goes below the lower limit of the condition (7), the focal length of the third lens unit becomes excessively large relatively. This can cause difficulty in ensuring satisfactory illuminance on the image surface.
Here, when at least one of the following conditions (7)′ and (7)′′ is satisfied, the above-mentioned effect is achieved more successfully.

0.30<fG2/fG3  (7)′

fG2/fG3<0.50  (7)′′

For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (8) is satisfied.

−0.80<fG1/fT<−0.30  (8)

(here, fT/fW>4.0 and ωW>35)
where,
fG1 is a focal length of the first lens unit,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
The condition (8) substantially sets forth the focal length of the first lens unit. When the value exceeds the upper limit of the condition (8), the focal length of the first lens unit becomes excessively large, and hence the amount of movement of the first lens unit increases. This causes difficulty in achieving a compact zoom lens system. In contrast, when the value goes below the lower limit of the condition (8), the focal length of the first lens unit becomes excessively small, and hence difficulty arises in maintaining a sufficient air space for ensuring the movement of the second lens unit during zooming. This can cause difficulty in achieving a zoom lens system having a variable magnification ratio of 4 or greater.
Here, when at least one of the following conditions (8)′ and (8)′′ is satisfied, the above-mentioned effect is achieved more successfully.

−0.60<fG1/fT  (8)′

fG1/fT<−0.40  (8)′′

(here, fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (8), (8)′ and (8)′′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (9) is satisfied.

0.20<fG2/fT<0.80  (9)

(here, fT/fW>4.0 and ωW>35)
where,
fG2 is a focal length of the second lens unit,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
The condition (9) substantially sets forth the focal length of the second lens unit. When the value exceeds the upper limit of the condition (9), the focal length of the second lens unit becomes excessively large, and hence the amount of movement of the second lens unit during zooming increases. This can cause difficulty in achieving a compact zoom lens system having a variable magnification ratio of 4 or greater. In contrast, when the value goes below the lower limit of the condition (9), the focal length of the second lens unit becomes excessively small. This can cause difficulty in compensating aberration fluctuation generated in association with the movement of the second lens unit. Further, when the value goes below the lower limit of the condition (9), difficulty can arise also in compensating distortion.
Here, when at least one of the following conditions (9)′ and (9)′′ is satisfied, the above-mentioned effect is achieved more successfully.

0.30<fG2/fT  (9)′

fG2/fT<0.50  (9)′′

(here, fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (9), (9)′ and (9)′′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (10) is satisfied.

0.60<fG3/fT<1.50  (10)

(here, fT/fW>4.0 and ωW>35)
where,
fG3 is a focal length of the third lens unit,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
The condition (10) substantially sets forth the focal length of the third lens unit. When the value exceeds the upper limit of the condition (10), the focal length of the third lens unit becomes excessively large. This can cause difficulty in ensuring appropriate illuminance on the image surface. In contrast, when the value goes below the lower limit of the condition (10), the focal length of the third lens unit becomes excessively small. This can cause that aberration generated in the third lens unit becomes difficult to be compensated by the second lens unit.
Here, when at least one of the following conditions (10)′ and (10)′′ is satisfied, the above-mentioned effect is achieved more successfully.

0.70<fG3/fT  (10)′

fG3/fT<1.30  (10)′′

(here, fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (10), (10)′ and (10)′′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (11) is satisfied.

0.35<(D1W+D2W)/(D1T+D2T)<1.20  (11)

(here, fT/fW>4.0 and ωW>35)
where,
D1W is an axial interval from the most image side of the first lens unit to the most object side of the second lens unit at a wide-angle limit,
D2W is an axial interval from the most image side of the second lens unit to the most object side of the third lens unit at a wide-angle limit,
D1T is an axial interval from the most image side of the first lens unit to the most object side of the second lens unit at a telephoto limit,
D2T is an axial interval from the most image side of the second lens unit to the most object side of the third lens unit at a telephoto limit,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
The condition (11) relates to the amount of movement of the first lens unit and the second lens unit during zooming. When the value exceeds the upper limit of the condition (11), compensation becomes insufficient for distortion at a wide-angle limit, and hence difficulty can arise in achieving satisfactory optical performance. In contrast, when the value goes below the lower limit of the condition (11), the amount of movement of the individual lens units necessary in association with zooming increases. This can cause difficulty in compensating aberration fluctuation during zooming.
Here, when at least one of the following conditions (11)′ and (11)′′ is satisfied, the above-mentioned effect is achieved more successfully.

0.45<(D1W+D2W)/(D1T+D2T)  (11)′

(D1W+D2W)/(D1T+D2T)<0.80  (11)′′

(here, fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (11), (11)′ and (11)′′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (12) is satisfied.

2.00<(D2T−D2W)/fW<6.00  (12)

(here, fT/fW>4.0 and ωW>35)
where,
D2T is an axial interval from the most image side of the second lens unit to the most object side of the third lens unit at a telephoto limit,
D2W is an axial interval from the most image side of the second lens unit to the most object side of the third lens unit at a wide-angle limit,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
The condition (12) relates to the amount of movement of the second lens unit. When the value exceeds the upper limit of the condition (12), the amount of movement of the second lens unit necessary in association with zooming increases. This can cause difficulty in compensating aberration fluctuation during zooming. In contrast, when the value goes below the lower limit of the condition (12), a tendency becomes dominant that the focal length of the second lens unit becomes small. This can cause difficulty in compensating distortion especially at a wide-angle limit.
Here, when at least one of the following conditions (12)′ and (12)′′ is satisfied, the above-mentioned effect is achieved more successfully.

3.00<(D2T−D2W)/fW  (12)′

(D2T−D2W)/fW<5.50  (12)′′

(here, fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (12), (12)′ and (12)′′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (13) is satisfied.

0.65<(D2T−D2W)/fT<1.10  (13)

(here, fT/fW>4.0 and ωW>35)
where,
D2T is an axial interval from the most image side of the second lens unit to the most object side of the third lens unit at a telephoto limit,
D2W is an axial interval from the most image side of the second lens unit to the most object side of the third lens unit at a wide-angle limit,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
The condition (13) relates to the amount of movement of the second lens unit. When the value exceeds the upper limit of the condition (13), the amount of movement of the second lens unit necessary in association with zooming increases. This can cause difficulty in compensating aberration fluctuation during zooming. In contrast, when the value goes below the lower limit of the condition (13), a tendency becomes dominant that the focal length of the second lens unit becomes small. This can cause difficulty in simultaneously compensating distortion and curvature of field especially at a wide-angle limit.
Here, when at least one of the following conditions (13)′ and (13)′′ is satisfied, the above-mentioned effect is achieved more successfully.

0.75<(D2T−D2W)/fT  (13)′

(D2T−D2W)/fT<0.95  (13)′′

(here, fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (13), (13)′ and (13)′′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (14) is satisfied.

0.00<D1T/Ir<0.10  (14)

(here, fT/fW>4.0 and ωW>35)
where,
D1T is an axial interval from the most image side of the first lens unit to the most object side of the second lens unit at a telephoto limit,
Ir is a maximum image height (Ir=fT×tan(ωT)),
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit,
ωW is a half value (°) of the maximum view angle at a wide-angle limit, and
ωT is a half value (°) of a maximum view angle at a telephoto limit.
The condition (14) relates to the air space between the first lens unit and the second lens unit. When the value exceeds the upper limit of the condition (14), the air space between the first lens unit and the second lens unit becomes excessively large. This causes difficulty in obtaining satisfactory magnification in the zoom lens system, and can cause difficulty in compensating distortion especially at a wide-angle limit. In contrast, when the value goes below the lower limit of the condition (14), the air space between the first lens unit and the second lens unit becomes excessively small. This similarly can cause difficulty in compensating distortion at a wide-angle limit.
Further, it is more preferable that the condition (14) is satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (15) is satisfied.

0.10<(fW/Ir)×(fW/fT)<0.40  (15)

(here, Z=fT/fW>4.0 and ωW>35)
where,
Ir is a maximum image height (Ir=fT×tan(ωT)),
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
The condition (15) relates to the variable magnification ratio of the zoom lens system. When the value falls outside the range of the condition (15), difficulty can arise in ensuring a zoom ratio of 4 or the like in a state that a satisfactory view angle at a wide-angle limit is obtained.
Here, when at least one of the following conditions (15)′ and (15)′′ is satisfied, the above-mentioned effect is achieved more successfully.

0.20<(fW/Ir)×(fW/fT)  (15)′

(fW/Ir)×(fW/fT)<0.35  (15)′′

(here, fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (15), (15)′ and (15)′′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (16) is satisfied.

2.50<tan(ωW)×Z<6.00  (16)

(here, Z=fT/fW>4.0 and ωW>35)
where,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
The condition (16) relates to the variable magnification ratio of the zoom lens system. When the value falls outside the range of the condition (16), difficulty can arise in ensuring a zoom ratio of 4 or the like in a state that a satisfactory view angle at a wide-angle limit is obtained.
Here, when at least one of the following conditions (16)′ and (16)′′ is satisfied, the above-mentioned effect is achieved more successfully.

3.00<tan(ωW)×Z  (16)′

tan(ωW)×Z<5.50  (16)′′

(here, fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (16), (16)′ and (16)′′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (17) is satisfied.

2.00<|fW×fG1|/Ir2<6.00  (17)

(here, Z=fT/fW>4.0 and ωW>35)
where,
Ir is a maximum image height (Ir=fT×tan(ωT)),
fG1 is a focal length of the first lens unit,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit,
ωW is a half value (°) of the maximum view angle at a wide-angle limit, and
ωT is a half value (°) of a maximum view angle at a telephoto limit.
The condition (17) substantially sets forth the focal length of the first lens unit. When the value exceeds the upper limit of the condition (17), the focal length of the first lens unit becomes excessively large, and hence the amount of movement of the first lens unit during zooming increases. This can cause difficulty in achieving a compact zoom lens system having a variable magnification ratio of 4 or greater. In contrast, when the value goes below the lower limit of the condition (17), the focal length of the first lens unit becomes excessively small. This can cause difficulty in compensating distortion in a state that a wide view angle is obtained at a wide-angle limit.
Here, when at least one of the following conditions (17)′ and (17)′′ is satisfied, the above-mentioned effect is achieved more successfully.

2.50<|fW×fG1|/Ir2  (17)′

|fW×fG1|/Ir2<5.00  (17)′′

(here, fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (17), (17)′ and (17)′′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (18) is satisfied.

2.00<(fW·fG2)/Ir2<6.00  (18)

(here, Z=fT/fW>4.0 and ωW>35)
where,
Ir is a maximum image height (Ir=fT×tan(ωT)),
fG2 is a focal length of the second lens unit,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit,
ωW is a half value (°) of the maximum view angle at a wide-angle limit, and
ωT is a half value (°) of a maximum view angle at a telephoto limit.
The condition (18) substantially sets forth the focal length of the second lens unit. When the value exceeds the upper limit of the condition (18), the focal length of the second lens unit becomes excessively large, and hence the amount of movement of the second lens unit during zooming increases. This can cause difficulty in achieving a compact zoom lens system having a variable magnification ratio of 4 or greater. In contrast, when the value goes below the lower limit of the condition (18), the focal length of the second lens unit becomes excessively small. This can cause difficulty in compensating aberration fluctuation generated in association with the movement of the second lens unit. Further, when the value goes below the lower limit of the condition (18), difficulty can arise also in compensating distortion.
Here, when at least one of the following conditions (18)′ and (18)′′ is satisfied, the above-mentioned effect is achieved more successfully.

2.50<(fW·fG2)/Ir2  (18)′

(fW·fG2)/Ir2<5.00  (18)′′

(here, fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (18), (18)′ and (18)′′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (19) is satisfied.

(DG1+DG2+DG3)/fT<0.70  (19)

(here, fT/fW>4.0 and ωW>35)
where,
DG1 is an axial interval from the most object side to the most image side of the first lens unit,
DG2 is an axial interval from the most object side to the most image side of the second lens unit,
DG3 is an axial interval from the most object side to the most image side of the third lens unit,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
The condition (19) relates to the overall length at the time of accommodation. When a so-called retraction construction that is free from protrusions at the time of accommodation is to be realized, the total of the axial intervals between the individual lens units need be sufficiently small. When the value exceeds the upper limit of the condition (19), the overall length at the time of retraction becomes excessively large, and hence this situation is unpreferable.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (20) is satisfied.

3.5<(FW×FT)/Z<5.0  (20)

(here, Z=fT/fW>4.0 and ωW>35)
where,
FW is a minimum F-number at a wide-angle limit,
FT is a minimum F-number at a telephoto limit,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
The condition (20) relates to the F-number of the zoom lens system. When the value falls outside the range of the condition (20), difficulty can arise in achieving a bright zoom lens system having a small F-number in a state that satisfactory optical performance is obtained.
When the following condition (20)′ is satisfied, the above-mentioned effect is achieved more successfully.

(FW×FT)/Z<4.7  (20)′

(here, Z=fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (20) and (20)′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (21) is satisfied.

1.5<LT/(Ir×Z)<2.6  (21)

(here, Z=fT/fW>4.0 and ωW>35)
where,
Ir is a maximum image height (Ir=fT×tan(ωT)),
LT is an overall length at a telephoto limit (a distance from the most object side of the first lens unit to the image surface),
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit,
ωW is a half value (°) of the maximum view angle at a wide-angle limit, and
ωT is a half value (°) of a maximum view angle at a telephoto limit.
The condition (21) sets forth the overall length especially at a telephoto limit. When the value exceeds the upper limit of the condition (21), a tendency of increase in the overall length of the zoom lens system becomes dominant. This can cause difficulty in achieving a compact zoom lens system. In contrast, when the value goes below the lower limit of the condition (21), a tendency of decrease in the overall length of the zoom lens system becomes dominant, and hence the focal length of each lens unit becomes excessively small. This can cause difficulty in compensating various kinds of aberration.
Here, it is more preferable that the condition (21) is satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (22) is satisfied.

4.0<(DG2+(DG2A))/(DG2A)<20.0  (22)

where,
DG2 is an axial interval from the most object side to the most image side of the second lens unit, and
DG2A is an axial interval from the most image side of the second lens unit to the aperture diaphragm.
The condition (22) sets forth an appropriate interval between the second lens unit and the aperture diaphragm. When the value exceeds the upper limit of the condition (22), a tendency becomes dominant that the diaphragm position becomes distant from the second lens unit. Thus, the effective diameter of the first lens unit becomes excessively large, and difficulty can arise in compensating distortion and coma aberration especially at a wide-angle limit. In contrast, when the value goes below the lower limit of the condition (22), a tendency becomes dominant that the diaphragm position becomes close to the second lens unit. This can cause difficulty in compensation of spherical aberration to be performed by the second lens unit.
When the following condition (22)′ is satisfied, the above-mentioned effect is achieved more successfully.

8.0<(DG2+(DG2A))/(DG2A)  (22)′

For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, in a case that the first lens unit, in order from the object side to the image side, comprises a first lens element having negative optical power and a second lens element having positive optical power, it is preferable that the following condition (23) is satisfied.

−2.00<fL2/fG1<−1.00  (23)

where,
fL2 is a focal length of the second lens element, and
fG1 is a focal length of the first lens unit.
The condition (23) sets forth the focal length of the second lens element of the first lens unit. When the value exceeds the upper limit of the condition (23), the focal length of the second lens element becomes excessively large. This can cause difficulty in compensating coma aberration especially at a telephoto limit. In contrast, when the value goes below the lower limit of the condition (23), the focal length of the second lens element becomes excessively small. This can cause difficulty in compensating distortion at a wide-angle limit.
When the following condition (23)′ is satisfied, the above-mentioned effect is achieved more successfully.

−1.60<fL2/fG1  (23)′

For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, in a case that the first lens unit, in order from the object side to the image side, comprises a first lens element having negative optical power and a second lens element having positive optical power, it is preferable that the following condition (24) is satisfied.

0.20<R2F/fT<0.50  (24)

(here, Z=fT/fW>4.0 and ωW>35)
where,
R2F is a radius of curvature of the object side surface of the second lens element,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
The condition (24) sets forth the object side surface of the second lens element of the first lens unit. When the value falls outside the range of the condition (24), difficulty can arise in compensating distortion at a wide-angle limit.
When the following condition (24)′ is satisfied, the above-mentioned effect is achieved more successfully.

R2F/fT<0.45  (24)′

(here, Z=fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (24) and (24)′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, in a case that the first lens unit, in order from the object side to the image side, comprises a first lens element having negative optical power and a second lens element having positive optical power, it is preferable that the following condition (25) is satisfied.

0.30<R2R/fT<0.90  (25)

(here, Z=fT/fW>4.0 and ωW>35)
where,
R2R is a radius of curvature of the image side surface of the second lens element,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
The condition (25) sets forth the image side surface of the second lens element of the first lens unit. When the value falls outside the range of the condition (25), difficulty can arise in compensating distortion at a wide-angle limit.
Here, when the following condition (25)′ is satisfied, the above-mentioned effect is achieved more successfully.

R2R/fT<0.85  (25)′

(here, Z=fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (25) and (25)′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-20 to I-24, in a case that the second lens unit, in order from the object side to the image side, comprises a first cemented lens element constructed by cementing two lens elements with each other and a second cemented lens element constructed by cementing two lens elements with each other, it is preferable that the following condition (28) is satisfied.

2.00<fG2a/fG2b<3.00  (28)

where,
fG2a is a focal length of the first cemented lens element, and
fG2b is a focal length of the second cemented lens element.
The condition (28) sets forth appropriate focal lengths of cemented lens elements in a case that the second lens unit is composed of two sets of the cemented lens elements. When the value exceeds the upper limit of the condition (28), decentering error sensitivity of the second lens unit becomes excessively high. Thus, performance degradation can be caused by an assembling error. In particular, degradation in image surface property can be caused by relative decentering. In contrast, when the value goes below the lower limit of the condition (28), difficulty can arise in compensating spherical aberration generated in the second lens unit.
When the following condition (28)′ is satisfied, the above-mentioned effect is achieved more successfully.

2.25<fG2a/fG2b  (28)′

For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, in which the second lens unit moves in a direction perpendicular to the optical axis, it is preferable that the following condition (29) is satisfied.

2.00<(1−m2T)×m3T<5.00  (29)

(here, Z=fT/fW>4.0 and ωW>35)
where,
m2T is a lateral magnification of the second lens unit at a telephoto limit in an infinity in-focus condition,
m3T is a lateral magnification of the third lens unit at a telephoto limit in an infinity in-focus condition,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
The condition (29) is a condition for obtaining satisfactory imaging characteristics in a case that image blur compensation is performed by moving the second lens unit in a direction perpendicular to the optical axis. When the value exceeds the upper limit of the condition (29), the amount of movement of the second lens unit required for decentering the image by a predetermined amount becomes excessively small. Thus, difficulty arises in causing the second lens unit to perform parallel movement with precision. Accordingly, pixel deviation during image taking cannot sufficiently be reduced. This can cause difficulty in achieving satisfactory imaging characteristics in an image blur compensation state. In contrast, when the value goes below the lower limit of the condition (29), the amount of decentering of the second lens unit required for decentering the image by a predetermined amount becomes excessively large. Thus, a large aberration change is generated in association with the parallel movement of the second lens unit. This causes a possibility of degradation in the imaging characteristics in the image periphery part.
When the following condition (29)′ is satisfied, the above-mentioned effect is achieved more successfully.

2.50<(1−m2T)×m3T  (29)′

(here, Z=fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (29) and (29)′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (30) is satisfied.

3.50<m2T/m2W<5.50  (30)

(here, Z=fT/fW>4.0 and ωW>35)
where,
m2T is a lateral magnification of the second lens unit at a telephoto limit in an infinity in-focus condition,
m2W is a lateral magnification of the second lens unit at a wide-angle limit in an infinity in-focus condition,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
The condition (30) sets forth magnification change in the second lens unit, and substantially optimizes a variable magnification load to the second lens unit during zooming. When the value falls outside the range of the condition (30), the variable magnification load to the second lens unit becomes inappropriate. This can cause difficulty in constructing a compact zoom lens system having satisfactory optical performance.
When the following condition (30)′ is satisfied, the above-mentioned effect is achieved more successfully.

4.00<m2T/m2W  (30)′

(here, Z=fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (30) and (30)′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, it is preferable that the following condition (31) is satisfied.

−6.00<(1−m2T/m2W)×(m3T/m3W)<−3.00  (31)

(here, Z=fT/fW>4.0 and ωW>35)
where,
m2T is a lateral magnification of the second lens unit at a telephoto limit in an infinity in-focus condition,
m2W is a lateral magnification of the second lens unit at a wide-angle limit in an infinity in-focus condition,
m3T is a lateral magnification of the third lens unit at a telephoto limit in an infinity in-focus condition,
m3W is a lateral magnification of the third lens unit at a wide-angle limit in an infinity in-focus condition,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
The condition (31) sets forth magnification change in the second lens unit and the third lens unit, and substantially optimizes a variable magnification load to the second lens unit and the third lens unit during zooming. When the value falls outside the range of the condition (31), distribution of the variable magnification load between the second lens unit and the third lens unit becomes inappropriate. This can cause difficulty in constructing a compact zoom lens system having satisfactory optical performance.
When the following condition (31)′ is satisfied, the above-mentioned effect is achieved more successfully.

−4.00<(1−m2T/m2W)×(m3T/m3W)  (31)′

(here, Z=fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (31) and (31)′ are satisfied with a condition ωW>40.
For example, in a zoom lens system like the zoom lens system according to Embodiments I-1 to I-24 and a zoom lens system like the zoom lens system according to Embodiments II-1 to II-18, in which the second lens unit moves in a direction perpendicular to the optical axis, it is preferable that the following condition (32) is satisfied.

1.00<(1−m2W)×m3W<1.50  (32)

(here, Z=fT/fW>4.0 and ωW>35)
where,
m2W is a lateral magnification of the second lens unit at a wide-angle limit in an infinity in-focus condition,
m3W is a lateral magnification of the third lens unit at a wide-angle limit in an infinity in-focus condition,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.
The condition (32) is a condition for obtaining satisfactory imaging characteristics in a case that image blur compensation is performed by moving the second lens unit in a direction perpendicular to the optical axis. When the value exceeds the upper limit of the condition (32), the amount of movement of the second lens unit required for decentering the image by a predetermined amount becomes excessively small. Thus, difficulty can arise in causing the second lens unit to perform parallel movement with precision. Accordingly, pixel deviation during image taking cannot sufficiently be reduced. This can cause difficulty in achieving satisfactory imaging characteristics in an image blur compensation state. In contrast, when the value goes below the lower limit of the condition (32), the amount of decentering of the second lens unit required for decentering the image by a predetermined amount becomes excessively large. Thus, a large aberration change is generated in association with the parallel movement of the second lens unit. This causes a possibility of degradation in the imaging characteristics in the image periphery part.
When the following condition (32)′ is satisfied, the above-mentioned effect is achieved more successfully.

1.15<(1−m2T)×m3T  (32)′

(here, Z=fT/fW>4.0 and ωW>35)
Further, it is more preferable that the conditions (32) and (32)′ are satisfied with a condition ωW>40.
The lens units constituting the zoom lens system of Embodiments I-1 to I-24 and the zoom lens system of Embodiments II-1 to II-18 are composed exclusively of refractive type lens elements that deflect the incident light by refraction (that is, lens elements of a type in which deflection is achieved at the interface between media each having a distinct refractive index). However, the present invention is not limited to the zoom lens system of this construction. For example, the lens units may employ diffractive type lens elements that deflect the incident light by diffraction; refractive-diffractive hybrid type lens elements that deflect the incident light by a combination of diffraction and refraction; or gradient index type lens elements that deflect the incident light by distribution of refractive index in the medium.
Moreover, in each embodiment, a configuration has been described that on the object side relative to the image surface S (that is, between the image surface S and the most image side lens surface of the third lens unit G3), a plane parallel plate such as an optical low-pass filter and a face plate of an image sensor is provided. This low-pass filter may be: a birefringent type low-pass filter made of, for example, a crystal whose predetermined crystal orientation is adjusted; or a phase type low-pass filter that achieves required characteristics of optical cut-off frequency by diffraction.
(Embodiments I-25 and II-19)
FIG. 127 is a schematic construction diagram of a digital still camera according to Embodiments I-25 and II-18. In FIG. 127, the digital still camera comprises: an imaging device having a zoom lens system 1 and an image sensor 2 that is a CCD; a liquid crystal display monitor 3; and a body 4. The employed zoom lens system 1 is a zoom lens system according to Embodiments I-1 and II-1. In FIG. 127, the zoom lens system 1 comprises a first lens unit G1, a second lens unit G2, an aperture diaphragm A and a third lens unit G3. In the body 4, the zoom lens system 1 is arranged on the front side, while the image sensor 2 is arranged on the rear side of the zoom lens system 1. On the rear side of the body 4, the liquid crystal display monitor 3 is arranged, while an optical image of a photographic object generated by the zoom lens system 1 is formed on an image surface S.
The lens barrel comprises a main barrel 5, a moving barrel 6 and a cylindrical cam 7. When the cylindrical cam 7 is rotated, the first lens unit G1, the second lens unit G2, the aperture diaphragm A and the third lens unit G3 move to predetermined positions relative to the image sensor 2, so that magnification change can be achieved ranging from a wide-angle limit to a telephoto limit. The third lens unit G3 is movable in an optical axis direction by a motor for focus adjustment.
As such, when the zoom lens system according to Embodiments I-1 and II-1 is employed in a digital still camera, a small digital still camera is obtained that has a high resolution and high capability of compensating the curvature of field and that has a short overall optical length at the time of non-use. Here, in the digital still camera shown in FIG. 127, any one of the zoom lens systems according to Embodiments I-2 to I-24 and II-2 to II-18 may be employed in place of the zoom lens system according to Embodiments I-1 and II-1. Further, the optical system of the digital still camera shown in FIG. 127 is applicable also to a digital video camera for moving images. In this case, moving images with high resolution can be acquired in addition to still images.
Here, the digital still camera according to the present Embodiments I-25 and II-19 has been described for a case that the employed zoom lens system 1 is a zoom lens system according to Embodiments I-1 to I-24 and II-1 to II-18. However, in these zoom lens systems, the entire zooming range need not be used. That is, in accordance with a desired zooming range, a range where satisfactory optical performance is obtained may exclusively be used. Then, the zoom lens system may be used as one having a lower magnification than the zoom lens system described in Embodiments I-1 to I-24 and II-1 to I-18.
Further, Embodiments I-25 and II-19 have been described for a case that the zoom lens system is applied to a lens barrel of so-called retraction construction. However, the present invention is not limited to this. For example, to a lens barrel of so-called bending configuration may be applied the zoom lens system where a prism having an internal reflective surface or a front surface reflective mirror is arranged at an arbitrary position within the first lens unit G1 or the like. Further, in Embodiments I-25 and II-19, the zoom lens system may be applied to a so-called sliding lens barrel where a part, such as the entire second lens unit G2, of the lens units that constitute the zoom lens system is retracted from the optical axis at the time of retraction.
Further, an imaging device comprising a zoom lens system according to Embodiments I-1 to I-24 and II-1 to II-18 described above and an image sensor such as a CCD or a CMOS may be applied to a mobile telephone, a PDA (Personal Digital Assistance), a surveillance camera in a surveillance system, a Web camera, a vehicle-mounted camera or the like.
Numerical examples are described below in which the zoom lens systems according to Embodiments I-1 to I-24 and II-1 to II-18 are implemented. In the numerical examples, the units of the length in the tables are all “mm”, while the units of the view angle are all “°”. Moreover, in the numerical examples, r is the radius of curvature, d is the axial distance, nd is the refractive index to the d-line, and vd is the Abbe number to the d-line. In the numerical examples, the surfaces marked with * are aspheric surfaces, and the aspheric surface configuration is defined by the following expression.




  z
  =
  
    
      
        
          h
          2
        
        /
        r
      
      
        1
        +
        
          
            1
            -
            
              
                (
                
                  1
                  +
                  κ
                
                )
              
              ⁢
              
                
                  (
                  
                    h
                    /
                    r
                  
                  )
                
                2
              
            
          
        
      
    
    +
    
      A
      ⁢
      
        
      
      ⁢
      4
      ⁢
      
        h
        4
      
    
    +
    
      A
      ⁢
      
        
      
      ⁢
      6
      ⁢
      
        h
        6
      
    
    +
    
      A
      ⁢
      
        
      
      ⁢
      8
      ⁢
      
        h
        8
      
    
    +
    
      A
      ⁢
      
        
      
      ⁢
      10
      ⁢
      
        h
        10
      
    
    +
    
      A
      ⁢
      
        
      
      ⁢
      12
      ⁢
      
        h
        12
      
    
    +
    
      A
      ⁢
      
        
      
      ⁢
      14
      ⁢
      
        h
        14
      
    
  




Here, κ is the conic constant, A4, A6, A8, A10, A12 and A14 are a fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order and fourteenth-order aspherical coefficients, respectively.

FIGS. 2, 5, 8, 11, 14, 17, 20, 23, 26, 29, 32, 35, 38, 41, 44, 47, 50, 53, 56, 59, 62, 65, 68 and 71 are longitudinal aberration diagrams of the zoom lens systems according to Embodiments I-1 to I-24, respectively.
FIGS. 74, 77, 80, 83, 86, 89, 92, 95, 98, 101, 104, 107, 110, 113, 116, 119, 122 and 125 are longitudinal aberration diagrams of the zoom lens systems according to Embodiments II-1 to II-18, respectively.
In each longitudinal aberration diagram, part (a) shows the aberration at a wide-angle limit, part (b) shows the aberration at a middle position, and part (c) shows the aberration at a telephoto limit. Each longitudinal aberration diagram, in order from the left-hand side, shows the spherical aberration (SA (mm)), the astigmatism (AST (mm)) and the distortion (DIS (%)). In each spherical aberration diagram, the vertical axis indicates the F-number (in each FIG., indicated as “F”), and the solid line, the short dash line and the long dash line indicate the characteristics to the d-line, the F-line and the C-line, respectively. In each astigmatism diagram, the vertical axis indicates the image height (in each FIG., indicated as “H”), and the solid line and the dash line indicate the characteristics to the sagittal plane (in each FIG., indicated as “s”) and the meridional plane (in each FIG., indicated as “m”), respectively. In each distortion diagram, the vertical axis indicates the image height (in each FIG., indicated as “H”).
FIGS. 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33, 36, 39, 42, 45, 48, 51, 54, 57, 60, 63, 66, 69 and 72 are lateral aberration diagrams of the zoom lens systems at a telephoto limit according to Embodiments I-1 to I-24, respectively.
FIGS. 75, 78, 81, 84, 87, 90, 93, 96, 99, 102, 105, 108, 111, 114, 117, 120, 123 and 126 are lateral aberration diagrams of the zoom lens systems at a telephoto limit according to Embodiments II-1 to II-18, respectively.
In each lateral aberration diagram, the aberration diagrams in the upper three parts correspond to a basic state where image blur compensation is not performed at a telephoto limit, while the aberration diagrams in the lower three parts correspond to an image blur compensation state where the entire second lens unit G2 is moved by a predetermined amount in a direction perpendicular to the optical axis at a telephoto limit. Among the lateral aberration diagrams of a basic state, the upper part shows the lateral aberration at an image point of 75% of the maximum image height, the middle part shows the lateral aberration at the axial image point, and the lower part shows the lateral aberration at an image point of −75% of the maximum image height. Among the lateral aberration diagrams of an image blur compensation state, the upper part shows the lateral aberration at an image point of 75% of the maximum image height, the middle part shows the lateral aberration at the axial image point, and the lower part shows the lateral aberration at an image point of −75% of the maximum image height. In each lateral aberration diagram, the horizontal axis indicates the distance from the principal ray on the pupil surface, and the solid line, the short dash line and the long dash line indicate the characteristics to the d-line, the F-line and the C-line, respectively. In each lateral aberration diagram, the meridional plane is adopted as the plane containing the optical axis of the first lens unit G1 and the optical axis of the second lens unit G2.
In the zoom lens system according to each example, the amount (YT) of movement of the second lens unit G2 in a direction perpendicular to the optical axis in an image blur compensation state at a telephoto limit is as follows.















Amount of movement



Example
YT (mm)









I-1
0.0820



I-2
0.0848



I-3
0.0838



I-4
0.0838



I-5
0.1025



I-6
0.0935



I-7
0.0847



I-8
0.0860



I-9
0.1038



I-10
0.0829



I-11
0.0854



I-12
0.0933



I-13
0.0841



I-14
0.1044



I-15
0.0972



I-16
0.0966



I-17
0.0974



I-18
0.0940



I-19
0.0989



I-20
0.0650



I-21
0.0707



I-22
0.0762



I-23
0.0678



I-24
0.0771



II-1
0.0820



II-2
0.0848



II-3
0.0838



II-4
0.0838



II-5
0.0838



II-6
0.1025



II-7
0.0935



II-8
0.0847



II-9
0.0860



II-10
0.1038



II-11
0.0829



II-12
0.0854



II-13
0.0933



II-14
0.0841



II-15
0.1016



II-16
0.1044



II-17
0.0972



II-18
0.0966










Here, when the shooting distance is infinity, at a telephoto limit, the amount of image decentering in a case that the zoom lens system inclines by 0.6° is equal to the amount of image decentering in a case that the entire second lens unit G2 moves in parallel by each of the above-mentioned values in a direction perpendicular to the optical axis.
As seen from the lateral aberration diagrams, satisfactory symmetry is obtained in the lateral aberration at the axial image point. Further, when the lateral aberration at the +75% image point and the lateral aberration at the −75% image point are compared with each other in a basic state, all have a small degree of curvature and almost the same inclination in the aberration curve. Thus, decentering coma aberration and decentering astigmatism are small. This indicates that sufficient imaging performance is obtained even in an image blur compensation state. Further, when the image blur compensation angle of a zoom lens system is the same, the amount of parallel movement required for image blur compensation decreases with decreasing focal length of the entire zoom lens system. Thus, at arbitrary zoom positions, sufficient image blur compensation can be performed for image blur compensation angles up to 0.6° without degrading the imaging characteristics.
NUMERICAL EXAMPLE I-1
The zoom lens system of Numerical Example I-1 corresponds to Embodiment I-1 shown in FIG. 1. Table I-1 shows the surface data of the zoom lens system of Numerical Example I-1. Table I-2 shows the aspherical data. Table I-3 shows various data.







TABLE I-1 







(Surface data)











Surface number
r
d
nd
vd





Object surface
∞





 1*
188.92300
1.06000
1.85976
40.6


 2*
5.44500
1.73200


 3*
9.22600
1.98000
1.99537
20.7


 4
17.36000
Variable


 5*
4.94900
1.55900
1.80434
40.8


 6
117.92500
0.15300


 7
13.15200
1.05000
1.72916
54.7


 8
−21.47500
0.01000
1.56732
42.8


 9
−21.47500
0.40000
1.76182
26.6


10
3.74800
0.58300


11
22.33900
1.01500
1.69680
55.5


12
−19.41000
0.40000


13(Diaphragm)
∞
Variable


14*
−116.08400
1.40700
1.68863
52.8


15*
−12.09600
Variable


16
∞
0.28000
1.51680
64.2


17
∞
0.50000


18
∞
0.50000
1.51680
64.2


19
∞
(BF)


Image surface
∞
















TABLE I-2 





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = −1.00660E−06, A6 = 1.42786E−06,



A8 = −2.21841E−08, A10 = 4.62309E−11, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.50376E+00, A4 = 9.16971E−04, A6 = 9.94477E−06,



A8 = −3.69570E−06, A10 = 2.88772E−07, A12 = −9.37503E−09,



A14 = 1.08167E−10



Surface No. 3



K = 0.00000E+00, A4 = 1.33735E−04, A6 = 8.26828E−06,



A8 = −2.36263E−06, A10 = 1.72041E−07, A12 = −5.39358E−09,



A14 = 6.14991E−11



Surface No. 5



K = 0.00000E+00, A4 = −7.21745E−04, A6 = −2.78703E−06,



A8 = −1.01123E−05, A10 = 2.41573E−06, A12 = −3.18270E−07,



A14 = 1.76444E−08



Surface No. 14



K = 0.00000E+00, A4 = 3.84582E−04, A6 = −4.88167E−05,



A8 = 2.35198E−06, A10 = 4.74331E−08, A12 = −3.53285E−09,



A14 = 0.00000E+00



Surface No. 15



K = 0.00000E+00, A4 = 5.69667E−04, A6 = −3.94000E−05,



A8 = 1.79407E−06, A10 = 3.36301E−08, A12 = −2.29056E−09,



A14 = 0.00000E+00

















TABLE I-3 





(Various data)







Zooming ratio 5.02077













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.2071
10.2045
21.1228



F-number
2.90782
5.02380
6.11771



View angle
46.1595
20.5403
10.1174



Image height
3.8000
3.8000
3.8000



Overall length
33.0753
29.8672
37.3253



of lens system



BF
0.42136
0.37974
0.40715



d4
14.3760
4.3000
0.2000



d13
1.7728
9.7004
21.4167



d15
3.8761
2.8581
2.6724











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−11.10099


2
5
9.35617


3
14
19.50093









NUMERICAL EXAMPLE I-2
The zoom lens system of Numerical Example I-2 corresponds to Embodiment I-2 shown in FIG. 4. Table I-4 shows the surface data of the zoom lens system of Numerical Example I-2. Table I-5 shows the aspherical data. Table I-6 shows various data.







TABLE I-4 







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1
91.71600
1.06000
1.85976
40.6



 2*
5.02500
1.73200



 3*
8.10500
1.98000
1.99537
20.7



 4
15.41300
Variable



 5
4.67900
1.55000
1.80434
40.8



 6
20.06000
0.15000



 7
17.38100
1.05000
1.72916
54.7



 8
−7.78900
0.01000
1.56732
42.8



 9
−7.78900
0.40000
1.76182
26.6



10
5.54400
0.58300



11*
9.60700
1.03000
1.69680
55.5



12*
24.77100
0.40000



13(Diaphragm)
∞
Variable



14*
143.86300
1.40700
1.68863
52.8



15*
−14.99700
Variable



16
∞
0.28000
1.51680
64.2



17
∞
0.50000



18
∞
0.50000
1.51680
64.2



19
∞
(BF)



Image surface
∞

















TABLE I-5 





(Aspherical data)

















Surface No. 2



K = −1.72393E+00, A4 = 8.21522E−04, A6 = 2.55266E−05,



A8 = −3.88679E−06, A10 = 2.77924E−07, A12 = −9.47533E−09,



A14 = 1.16437E−10



Surface No. 3



K = 0.00000E+00, A4 = −2.24219E−04, A6 = 2.10672E−05,



A8 = −2.55993E−06, A10 = 1.68943E−07, A12 = −5.44312E−09,



A14 = 6.31627E−11



Surface No. 11



K = 0.00000E+00, A4 = −1.79281E−03, A6 = −2.82240E−04,



A8 = 1.33862E−05, A10 = 7.24137E−06, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 12



K = 0.00000E+00, A4 = 8.20695E−04, A6 = −3.73734E−05,



A8 = −4.11489E−07, A10 = 1.63224E−05, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 14



K = 0.00000E+00, A4 = −1.43793E−03, A6 = 6.22989E−05,



A8 = −3.57284E−06, A10 = 4.27742E−08, A12 = 1.29183E−09,



A14 = 0.00000E+00



Surface No. 15



K = 0.00000E+00, A4 = −1.03151E−03, A6 = −6.84282E−06,



A8 = 2.21877E−06, A10 = −1.02480E−07, A12 = 1.11563E−09,



A14 = 0.00000E+00

















TABLE I-6 





(Various data)







Zooming ratio 4.78728













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.5625
10.3339
21.8419



F-number
2.91681
4.41216
6.27025



View angle
43.7744
20.6796
9.7181



Image height
3.8000
3.8000
3.8000



Overall length
32.9851
26.5722
37.4677



of lens system



BF
0.42089
0.40791
0.39091



d4
13.9363
2.2741
0.2000



d13
2.4243
4.3279
21.6993



d15
3.5716
6.9303
2.5455











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−11.49994


2
5
9.44980


3
14
19.79358









NUMERICAL EXAMPLE I-3
The zoom lens system of Numerical Example I-3 corresponds to Embodiment I-3 shown in FIG. 7. Table I-7 shows the surface data of the zoom lens system of Numerical Example I-3. Table I-8 shows the aspherical data. Table I-9 shows various data.







TABLE I-7







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1*
140.23000
1.06000
1.89816
34.5



 2*
5.45300
1.73200



 3*
9.42700
1.98000
2.13854
17.8



 4
17.36000
Variable



 5*
4.99100
1.55000
1.80434
40.8



 6
117.92500
0.15000



 7
12.94200
1.05000
1.72916
54.7



 8
−13.72800
0.01000
1.56732
42.8



 9
−13.72800
0.40000
1.76182
26.6



10
3.74800
0.58300



11
20.43300
1.03000
1.69680
55.5



12
−21.48900
0.40000



13(Diaphragm)
∞
Variable



14*
−116.08400
1.40700
1.68863
52.8



15*
−12.26900
Variable



16
∞
0.28000
1.51680
64.2



17
∞
0.50000



18
∞
0.50000
1.51680
64.2



19
∞
(BF)



Image surface
∞

















TABLE I-8





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = −5.16032E−06, A6 = 1.36006E−06,



A8 = −2.35032E−08, A10 = 9.64467E−12, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.54603E+00, A4 = 8.66310E−04, A6 = 1.05013E−05,



A8 = −3.56556E−06, A10 = 2.87567E−07, A12 = −9.59572E−09,



A14 = 1.13274E−10



Surface No. 3



K = 0.00000E+00, A4 = 5.82564E−05, A6 = 1.23467E−05,



A8 = 2.44842E−06, A10 = 1.70937E−07, A12 = −5.28376E−09,



A14 = 6.04276E−11



Surface No. 5



K = 0.00000E+00, A4 = −6.59982E−04, A6 = −1.07316E−05,



A8 = −7.67478E−06, A10 = 2.20031E−06, A12 = −3.14693E−07,



A14 = 1.71160E−08



Surface No. 14



K = 0.00000E+00, A4 = 3.98783E−04, A6 = −4.87903E−05,



A8 = 2.32347E−06, A10 = 4.49831E−08, A12 = −3.64603E−09,



A14 = 0.00000E+00



Surface No. 15



K = 0.00000E+00, A4 = 6.66651E−04, A6 = −6.35825E−05,



A8 = 3.80613E−06, A10 = −2.17291E−08, A12 = −2.43698E−09,



A14 = 0.00000E+00

















TABLE I-9





(Various data)







Zooming ratio 4.75067













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.5762
10.2956
21.7403



F-number
2.90973
4.76492
6.12812



View angle
43.6578
20.3579
9.8270



Image height
3.8000
3.8000
3.8000



Overall length
32.9778
29.9914
37.7234



of lens system



BF
0.40883
0.36012
0.36629



d4
13.7226
4.3000
0.2000



d13
2.4223
9.4455
21.9297



d15
3.7921
3.2538
2.5954











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−11.37494


2
5
9.50394


3
14
19.81261









NUMERICAL EXAMPLE I-4
The zoom lens system of Numerical Example I-4 corresponds to Embodiment I-4 shown in FIG. 10. Table I-10 shows the surface data of the zoom lens system of Numerical Example I-4. Table I-11 shows the aspherical data. Table I-12 shows various data.







TABLE I-10







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1*
277.61100
1.06000
1.80470
41.0



 2*
5.18600
1.73200



 3*
9.15400
1.98000
1.99537
20.7



 4
17.36000
Variable



 5*
5.09400
1.55000
1.87290
40.8



 6
117.92500
0.15000



 7
16.28000
1.05000
1.72916
54.7



 8
−13.60500
0.01000
1.56732
42.8



 9
−13.60500
0.40000
1.76182
26.6



10
3.74800
0.58300



11
28.27400
1.03000
1.69680
55.5



12
−16.70500
0.40000



13(Diaphragm)
∞
Variable



14*
−116.08400
1.40700
1.68863
52.8



15*
−12.24500
Variable



16
∞
0.28000
1.51680
64.2



17
∞
0.50000



18
∞
0.50000
1.51680
64.2



19
∞
(BF)



Image surface
∞

















TABLE I-11





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = −5.16032E−06, A6 = 1.36006E−06,



A8 = −2.35032E−08, A10 = 9.64467E−12,



A12 = 0.00000E+00, A14 = 0.00000E+00



Surface No. 2



K = −1.21146E+00, A4 = 9.42719E−04, A6 = 8.22480E−06,



A8 = −3.73153E−06, A10 = 2.89294E−07,



A12 = −9.56885E−09, A14 = 1.15064E−10



Surface No. 3



K = 0.00000E+00, A4 = 1.96871E−04, A6 = 9.09412E−06,



A8 = −2.42115E−06, A10 = 1.68578E−07,



A12 = −5.27161E−09, A14 = 6.24497E−11



Surface No. 5



K = 0.00000E+00, A4 = −5.89690E−04, A6 = −2.66456E−05,



A8 = −4.67652E−06, A10 = 2.49299E−06,



A12 = −4.37504E−07, A14 = 2.60253E−08



Surface No. 14



K = 0.00000E+00, A4 = 3.98783E−04, A6 = −4.87903E−05,



A8 = 2.32347E−06, A10 = 4.49831E−08,



A12 = −3.64603E−09, A14 = 0.00000E+00



Surface No. 15



K = 0.00000E+00, A4 = 4.95733E−04, A6 = −5.52926E−05,



A8 = 4.07254E−06, A10 = −8.39574E−08,



A12 = −3.60474E−10, A14 = 0.00000E+00

















TABLE I-12





(Various data)







Zooming ratio 4.73379













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.5814
10.3126
21.6875



F-number
2.90996
4.76998
6.12631



View angle
43.6298
20.5699
9.9939



Image height
3.8000
3.8000
3.8000



Overall length
32.9849
30.0104
37.7589



of lens system



BF
0.41591
0.37912
0.40176



d4
13.7226
4.3000
0.2000



d13
2.4562
9.4832
21.8879



d15
3.7582
3.2161
2.6372











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−11.36300


2
5
9.50654


3
14
19.76931









NUMERICAL EXAMPLE I-5
The zoom lens system of Numerical Example I-5 corresponds to Embodiment I-5 shown in FIG. 13. Table I-13 shows the surface data of the zoom lens system of Numerical Example I-5. Table I-14 shows the aspherical data. Table I-15 shows various data.







TABLE I-13







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1*
177.47800
1.03900
1.85976
40.6



 2*
6.63600
2.05700



 3*
11.13100
2.32400
1.99537
20.7



 4
21.12900
Variable



 5*
6.03400
1.85100
1.80434
40.8



 6
143.52700
0.20100



 7
15.89500
1.28000
1.72916
54.7



 8
−20.09100
0.01200
1.56732
42.8



 9
−20.09100
0.47900
1.76182
26.6



10
4.56200
0.74600



11
24.99300
1.11300
1.69680
55.5



12
−26.97000
0.48700



13(Diaphragm)
∞
Variable



14*
−141.28500
1.53800
1.68863
52.8



15*
−14.74800
Variable



16
∞
0.34100
1.51680
64.2



17
∞
0.60900



18
∞
0.60900
1.51680
64.2



19
∞
(BF)



Image surface
∞

















TABLE I-14





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = −2.86219E−06, A6 = 5.09247E−07,



A8 = −5.94077E−09, A10 = 1.64570E−12, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.53666E+00, A4 = 5.02282E−04, A6 = 4.46163E−06,



A8 = −9.10715E−07, A10 = 4.91821E−08, A12 = −1.09034E−09,



A14 = 8.46522E−12



Surface No. 3



K = 0.00000E+00, A4 = 5.74073E−05, A6 = 3.98544E−06,



A8 = −6.02600E−07, A10 = 2.93515E−08, A12 = −6.16876E−10,



A14 = 4.72214E−12



Surface No. 5



K = 0.00000E+00, A4 = −3.87012E−04, A6 = 1.94856E−06,



A8 = −3.17953E−06, A10 = 4.47726E−07, A12 = −3.24123E−08,



A14 = 9.30481E−10



Surface No. 14



K = 0.00000E+00, A4 = 2.21186E−04, A6 = −1.82685E−05,



A8 = 5.87291E−07, A10 = 7.67561E−09, A12 = −4.19983E−10,



A14 = 0.00000E+00



Surface No. 15



K = 0.00000E+00, A4 = 3.95412E−04, A6 = −2.36935E−05,



A8 = 8.28888E−07, A10 = 3.84189E−09, A12 = −4.16995E−10,



A14 = 0.00000E+00

















TABLE I-15





(Various data)







Zooming ratio 4.78219













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
5.5419
12.5134
26.5024



F-number
2.88513
4.73316
6.09875



View angle
43.7864
20.3478
9.7989



Image height
4.6250
4.6250
4.6250



Overall length
39.4596
35.8400
45.2842



of lens system



BF
0.50832
0.46420
0.50531



d4
16.7018
5.2335
0.2434



d13
2.9482
11.5357
26.7513



d15
4.6153
3.9206
3.0982











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−13.88579


2
5
11.53034


3
14
23.79460









NUMERICAL EXAMPLE I-6
The zoom lens system of Numerical Example I-6 corresponds to Embodiment I-6 shown in FIG. 16. Table I-16 shows the surface data of the zoom lens system of Numerical Example I-6. Table I-17 shows the aspherical data. Table I-18 shows various data.







TABLE I-16







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1
126.42600
1.06000
1.86000
40.6



 2*
5.72700
1.53700



 3*
8.95800
1.77600
1.99537
20.7



 4
17.36000
Variable



 5*
5.19400
1.56100
1.80434
40.8



 6
377.10900
0.30000



 7
17.42100
1.06600
1.72916
54.7



 8
−13.83000
0.01000
1.56732
42.8



 9
−13.83000
0.40000
1.76182
26.6



10
4.00000
0.58300



11
19.73300
1.07700
1.69680
55.5



12
−23.72700
0.40000



13(Diaphragm)
∞
Variable



14*
−1047.51300
1.40700
1.74993
45.4



15*
−14.88700
Variable



16
∞
0.28000
1.51680
64.2



17
∞
0.50000



18
∞
0.50000
1.51680
64.2



19
∞
(BF)



Image surface
∞

















TABLE I-17





(Aspherical data)

















Surface No. 2



K = −1.57344E+00, A4 = 7.46340E−04, A6 = 1.88232E−06,



A8 = −3.37126E−06, A10 = 2.89498E−07, A12 = −9.69126E−09,



A14 = 1.14218E−10



Surface No. 3



K = 0.00000E+00, A4 = 6.08925E−05, A6 = 2.83846E−06,



A8 = −2.14698E−06, A10 = 1.72132E−07, A12 = −5.49899E−09,



A14 = 6.19799E−11



Surface No. 5



K = 0.00000E+00, A4 = −5.98636E−04, A6 = −2.84764E−06,



A8 = −8.39427E−06, A10 = 2.21918E−06, A12 = −2.87429E−07,



A14 = 1.45836E−08



Surface No. 14



K = 0.00000E+00, A4 = −1.30794E−04, A6 = −9.53762E−06,



A8 = −1.31083E−06, A10 = 1.80961E−07, A12 = −4.51916E−09,



A14 = 0.00000E+00



Surface No. 15



K = 0.00000E+00, A4 = 1.09118E−04, A6 = −3.68938E−05,



A8 = 2.09767E−06, A10 = −3.35203E−08, A12 = 5.68690E−10,



A14 = 0.00000E+00

















TABLE I-18





(Various data)







Zooming ratio 4.61126













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
5.1178
11.0963
23.5995



F-number
2.90501
4.68134
6.13237



View angle
39.2002
18.9429
9.0829



Image height
3.8000
3.8000
3.8000



Overall length
33.5786
30.7415
38.3943



of lens system



BF
0.41039
0.37079
0.37158



d4
14.1000
4.7084
0.2000



d13
2.4138
9.8111
22.8264



d15
4.1974
3.3942
2.5393











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−12.85293


2
5
10.12689


3
14
20.12562









NUMERICAL EXAMPLE I-7
The zoom lens system of Numerical Example I-7 corresponds to Embodiment I-7 shown in FIG. 19. Table I-19 shows the surface data of the zoom lens system of Numerical Example I-7. Table I-20 shows the aspherical data. Table I-21 shows various data.







TABLE I-19







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1*
133.91200
1.06000
1.85976
40.6



 2*
5.42900
1.73200



 3*
9.15600
1.98000
1.99537
20.7



 4
17.36000
Variable



 5*
4.97400
1.55000
1.80434
40.8



 6
117.92500
0.15000



 7
13.33900
1.05000
1.72916
54.7



 8
−20.65000
0.01000
1.56732
42.8



 9
−20.65000
0.40000
1.76182
26.6



10
3.74800
0.58300



11
17.95000
1.03000
1.69680
55.5



12
−25.80200
0.40000



13(Diaphragm)
∞
Variable



14*
−116.08400
1.40700
1.68863
52.8



15*
−12.28300
Variable



16
∞
0.28000
1.51680
64.2



17
∞
0.50000



18
∞
0.50000
1.51680
64.2



19
∞
(BF)



Image surface
∞

















TABLE I-20





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = −5.52740E−06, A6 = 1.34755E−06,



A8 = −2.37945E−08, A10 = 6.53313E−12, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.51232E+00, A4 = 9.13792E−04, A6 = 1.00193E−05,



A8 = −3.69775E−06, A10 = 2.88686E−07, A12 = −9.37576E−09,



A14 = 1.08259E−10



Surface No. 3



K = 0.00000E+00, A4 = 1.27176E−04, A6 = 7.89593E−06,



A8 = −2.36128E−06, A10 = 1.72237E−07, A12 = −5.38467E−09,



A14 = 6.18081E−11



Surface No. 5



K = 0.00000E+00, A4 = −7.06960E−04, A6 = −3.25988E−07,



A8 = −9.87767E−06, A10 = 2.42687E−06, A12 = −3.19796E−07,



A14 = 1.70210E−08



Surface No. 14



K = 0.00000E+00, A4 = 3.70421E−04, A6 = −5.43849E−05,



A8 = 1.64888E−06, A10 = 1.80901E−09, A12 = −5.31193E−09,



A14 = 0.00000E+00



Surface No. 15



K = 0.00000E+00, A4 = 5.24695E−04, A6 = −4.63237E−05,



A8 = 1.20665E−06, A10 = 4.10694E−09, A12 = −4.23522E−09,



A14 = 0.00000E+00

















TABLE I-21





(Various data)







Zooming ratio 5.35662













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.5928
10.2950
24.6021



F-number
2.90896
4.74737
6.91879



View angle
43.5348
20.5052
8.8865



Image height
3.8000
3.8000
3.8000



Overall length
32.9479
30.0189
38.9815



of lens system



BF
0.40477
0.36130
0.37320



d4
13.7226
4.3000
0.2000



d13
2.2520
9.2104
24.8417



d15
3.9365
3.5152
0.9346











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−11.42384


2
5
9.55095


3
14
19.83788









NUMERICAL EXAMPLE I-8
The zoom lens system of Numerical Example I-8 corresponds to Embodiment I-8 shown in FIG. 22. Table I-22 shows the surface data of the zoom lens system of Numerical Example I-8. Table I-23 shows the aspherical data. Table I-24 shows various data.







TABLE I-22







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1*
102.49100
1.06000
1.85976
40.6



 2*
5.38400
1.73200



 3*
9.16300
1.98000
1.99537
20.7



 4
17.36000
Variable



 5*
4.98100
1.55000
1.80434
40.8



 6
117.92500
0.15000



 7
13.41700
1.05000
1.72916
54.7



 8
−22.36400
0.01000
1.56732
42.8



 9
−22.36400
0.40000
1.76182
26.6



10
3.74800
0.58300



11
17.49900
1.03000
1.69680
55.5



12
−27.91500
0.40000



13(Diaphragm)
∞
Variable



14*
−116.08400
1.40700
1.68863
52.8



15*
−12.30700
Variable



16
∞
0.28000
1.51680
64.2



17
∞
0.50000



18
∞
0.50000
1.51680
64.2



19
∞
(BF)



Image surface
∞

















TABLE I-23





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = −9.58085E−06, A6 = 1.28804E−06,



A8 = −2.45481E−08, A10 = −7.28916E−12, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.52889E+00, A4 = 9.08403E−04, A6 = 1.00563E−05,



A8 = −3.70044E−06, A10 = 2.88590E−07, A12 = −9.37676E−09,



A14 = 1.08272E−10



Surface No. 3



K = 0.00000E+00, A4 = 1.17643E−04, A6 = 7.85565E−06,



A8 = −2.35722E−06, A10 = 1.72387E−07, A12 = −5.38158E−09,



A14 = 6.18075E−11



Surface No. 5



K = 0.00000E+00, A4 = −6.97064E−04, A6 = 1.09037E−06,



A8 = −9.75291E−06, A10 = 2.43347E−06, A12 = −3.20810E−07,



A14 = 1.65049E−08



Surface No. 14



K = 0.00000E+00, A4 = 3.07888E−04, A6 = −5.28977E−05,



A8 = 1.68576E−06, A10 = 1.34836E−09, A12 = 1.29575E−10,



A14 = 0.00000E+00



Surface No. 15



K = 0.00000E+00, A4 = 5.47465E−04, A6 = −5.13331E−05,



A8 = 1.07290E−06, A10 = 4.69963E−08, A12 = −1.02369E−09,



A14 = 0.00000E+00

















TABLE I-24





(Various data)







Zooming ratio 5.52871













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.6725
10.3808
25.8329



F-number
2.94730
4.77127
7.24009



View angle
42.6119
20.1748
8.3929



Image height
3.8000
3.8000
3.8000



Overall length
33.0804
30.2033
40.0342



of lens system



BF
0.40551
0.36552
0.38499



d4
13.7226
4.3000
0.2000



d13
2.3123
9.1093
26.0977



d15
4.0080
3.7965
0.7195











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−11.50512


2
5
9.64428


3
14
19.88122









NUMERICAL EXAMPLE I-9
The zoom lens system of Numerical Example I-9 corresponds to Embodiment I-9 shown in FIG. 25. Table I-25 shows the surface data of the zoom lens system of Numerical Example I-9. Table I-26 shows the aspherical data. Table I-27 shows various data.







TABLE I-25







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1*
76.42751
1.00000
1.80470
41.0



 2*
6.64817
1.48000



 3
7.75447
1.60000
1.92286
20.9



 4
10.50123
Variable



 5*
5.53570
1.50000
1.80434
40.8



 6
−674.52140
0.30000



 7
10.79499
1.10000
1.72916
54.7



 8
−15.59648
0.01000
1.56732
42.8



 9
−15.59648
0.40000
1.76182
26.6



10
4.00000
0.64000



11
40.99489
1.10000
1.80146
40.2



12
−40.99489
0.30000



13(Diaphragm)
∞
Variable



14
−53.29376
1.33000
1.68863
52.8



15*
−12.58029
Variable



16
∞
0.28000
1.51680
64.2



17
∞
0.50000



18
∞
0.50000
1.51680
64.2



19
∞
(BF)



Image surface
∞

















TABLE I-26





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = 5.76012E−05, A6 = 8.73773E−07,



A8 = 0.00000E+00, A10 = 0.00000E+00, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.43352E+00, A4 = 6.73429E−04, A6 = −1.70436E−07,



A8 = 1.25757E−07, A10 = 3.13106E−08, A12 = −1.68591E−09,



A14 = 3.01568E−11



Surface No. 5



K = 0.00000E+00, A4 = −4.98245E−04, A6 = 4.02131E−06,



A8 = −1.18557E−05, A10 = 2.68271E−06, A12 = −2.79815E−07,



A14 = 1.08519E−08



Surface No. 15



K = 0.00000E+00, A4 = −3.33092E−05, A6 = 2.24255E−05,



A8 = −2.42474E−06, A10 = 1.37066E−07, A12 = −2.99454E−09,



A14 = 0.00000E+00

















TABLE I-27





(Various data)







Zooming ratio 4.72712













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
6.0022
13.0594
28.3731



F-number
3.44370
5.55842
6.33102



View angle
34.9812
16.3974
7.6997



Image height
3.8000
3.8000
3.8000



Overall length
33.8543
31.0006
39.9649



of lens system



BF
0.46119
0.40554
0.37123



d4
14.2069
4.6883
0.2000



d13
2.9360
10.1917
24.3632



d15
4.2102
3.6751
2.9905











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−13.93476


2
5
10.14370


3
14
23.59911









NUMERICAL EXAMPLE I-10
The zoom lens system of Numerical Example I-10 corresponds to Embodiment I-10 shown in FIG. 28. Table I-28 shows the surface data of the zoom lens system of Numerical Example I-10. Table I-29 shows the aspherical data. Table I-30 shows various data.







TABLE I-28







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1*
59.05000
1.06000
1.85280
39.0



 2*
5.46200
1.50400



 3*
8.60600
1.75000
1.99537
20.7



 4
14.38100
Variable



 5*
4.36700
2.50000
1.80359
40.8



 6
−67.53500
0.00000



 7
−67.53500
0.40000
1.80518
25.5



 8
3.80100
0.47700



 9
12.23200
1.14400
1.77250
49.6



10
−16.77300
0.30000



11(Diaphragm)
∞
Variable



12*
145.66100
1.33400
1.60602
57.4



13*
−11.92000
Variable



14
∞
0.78000
1.51680
64.2



15
∞
(BF)



Image surface
∞

















TABLE I-29





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = 3.04043E−06, A6 = 8.38044E−08,



A8 = 3.68394E−10, A10 = 1.11988E−11, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.14246E+00, A4 = 9.52084E−04, A6 = 1.16305E−05,



A8 = −3.37781E−06, A10 = 2.84249E−07, A12 = −9.68993E−09,



A14 = 1.17859E−10



Surface No. 3



K = 0.00000E+00, A4 = 2.77587E−04, A6 = 7.49692E−06,



A8 = −2.20563E−06, A10 = 1.70898E−07, A12 = −5.50993E−09,



A14 = 6.41238E−11



Surface No. 5



K = −2.43504E−01, A4 = −3.61300E−04, A6 = 1.01452E−05,



A8 = −3.95475E−06, A10 = 2.05823E−07, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 12



K = 0.00000E+00, A4 = −3.11808E−04, A6 = 1.60552E−05,



A8 = −9.71795E−07, A10 = 2.22891E−07, A12 = −2.85194E−09,



A14 = 0.00000E+00



Surface No. 13



K = 0.00000E+00, A4 = 3.67285E−05, A6 = −1.48330E−05,



A8 = 2.12933E−06, A10 = 5.52463E−08, A12 = 2.05349E−09,



A14 = 0.00000E+00

















TABLE I-30





(Various data)







Zooming ratio 4.70964













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.2182
10.9848
19.8661



F-number
2.91810
4.94788
6.15928



View angle
45.5442
19.1934
10.7826



Image height
3.8000
3.8000
3.8000



Overall length
32.2531
29.2032
33.9277



of lens system



BF
0.89844
0.85770
0.89904



d4
14.1856
3.9014
0.2000



d11
2.1610
11.4996
19.9321



d13
3.7591
1.6955
1.6476











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−11.81909


2
5
9.29435


3
12
18.23972









NUMERICAL EXAMPLE I-11
The zoom lens system of Numerical Example I-11 corresponds to Embodiment I-11 shown in FIG. 31. Table I-31 shows the surface data of the zoom lens system of Numerical Example I-11. Table I-32 shows the aspherical data. Table I-33 shows various data.







TABLE I-31







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1*
48.20000
1.06000
1.85280
39.0



 2*
5.40600
1.50400



 3*
8.59700
1.75000
1.99537
20.7



 4
14.38100
Variable



 5*
4.37800
2.50000
1.80359
40.8



 6
−74.88600
0.00000



 7
−74.88600
0.40000
1.80518
25.5



 8
3.79800
0.47700



 9
12.73200
1.14400
1.77250
49.6



10
−16.77300
0.30000



11(Diaphragm)
∞
Variable



12*
147.88000
1.33400
1.60602
57.4



13*
−13.66400
Variable



14
∞
0.78000
1.51680
64.2



15
∞
(BF)



Image surface
∞

















TABLE I-32





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = 3.27932E−07, A6 = −4.95347E−08,



A8 = 0.00000E+00, A10 = 0.00000E+00, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.15549E+00, A4 = 9.45387E−04, A6 = 1.00448E−05,



A8 = −3.40038E−06, A10 = 2.83776E−07, A12 = −9.69584E−09,



A14 = 1.17520E−10



Surface No. 3



K = 0.00000E+00, A4 = 2.60379E−04, A6 = 6.67780E−06,



A8 = −2.20806E−06, A10 = 1.70845E−07, A12 = −5.50808E−09,



A14 = 6.38203E−11



Surface No. 5



K = −2.33677E−01, A4 = −3.37270E−04, A6 = 5.87427E−06,



A8 = −3.18469E−06, A10 = 2.15900E−07, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 12



K = 0.00000E+00, A4 = −3.84815E−04, A6 = 1.89763E−05,



A8 = −9.66009E−07, A10 = 2.07197E−07, A12 = −2.90921E−09,



A14 = 0.00000E+00



Surface No. 13



K = 0.00000E+00, A4 = −8.25767E−05, A6 = −1.37702E−05,



A8 = 1.82480E−06, A10 = 5.49510E−08, A12 = 2.05096E−09,



A14 = 0.00000E+00

















TABLE I-33





(Various data)







Zooming ratio 4.66639













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.5138
11.0107
21.0630



F-number
2.92234
4.74573
6.11588



View angle
42.9660
19.1684
10.1843



Image height
3.8000
3.8000
3.8000



Overall length
32.9135
29.6175
34.9167



of lens system



BF
0.89634
0.86350
0.87175



d4
14.3758
4.2462
0.2000



d11
2.4307
11.1258
20.7413



d13
3.9617
2.1330
1.8547











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−12.09887


2
5
9.49321


3
12
20.70451









NUMERICAL EXAMPLE I-12
The zoom lens system of Numerical Example I-12 corresponds to Embodiment I-12 shown in FIG. 34. Table I-34 shows the surface data of the zoom lens system of Numerical Example I-12 Table I-15 shows the aspherical data Table I-16 shows various data







TABLE I-34







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1
43.56000
1.06000
1.85280
39.0



 2*
5.54700
1.50400



 3*
8.64600
1.75000
1.99537
20.7



 4
14.38100
Variable



 5*
4.39600
2.50000
1.80359
40.8



 6
−115.81400
0.00000



 7
−115.81400
0.40000
1.80518
25.5



 8
3.79300
0.47700



 9
14.69100
1.14400
1.77250
49.6



10
−16.77300
0.30000



11(Diaphragm)
∞
Variable



12*
79.01900
1.33400
1.60602
57.4



13*
−14.68200
Variable



14
∞
0.78000
1.51680
64.2



15
∞
(BF)



Image surface
∞

















TABLE I-35





(Aspherical data)

















Surface No. 2



K = −1.11955E+00, A4 = 9.72575E−04, A6 = 5.28421E−06,



A8 = −3.33441E−06, A10 = 2.83170E−07, A12 = −9.76538E−09,



A14 = 1.18913E−10



Surface No. 3



K = 0.00000E+00, A4 = 2.96666E−04, A6 = 4.70617E−06,



A8 = −2.23721E−06, A10 = 1.71468E−07, A12 = −5.48027E−09,



A14 = 6.24905E−11



Surface No. 5



K = −2.21945E−01, A4 = −3.12123E−04, A6 = 4.68008E−06,



A8 = −3.33833E−06, A10 = 2.42304E−07, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 12



K = 0.00000E+00, A4 = −5.07858E−04, A6 = 1.16247E−05,



A8 = −1.11086E−06, A10 = 1.55636E−07, A12 = −9.60910E−10,



A14 = 0.00000E+00



Surface No. 13



K = 0.00000E+00, A4 = −4.92557E−04, A6 = −2.33283E−06,



A8 = 7.70699E−07, A10 = 4.54566E−08, A12 = 2.00412E−09,



A14 = 0.00000E+00

















TABLE I-36





(Various data)







Zooming ratio 4.65926













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.9826
11.0055
23.2154



F-number
2.96523
4.88875
6.11703



View angle
38.2008
18.4701
8.9029



Image height
3.6000
3.6000
3.6000



Overall length
33.4459
31.3516
38.0142



of lens system



BF
0.90869
0.86454
0.89389



d4
14.2459
5.5449
0.2000



d11
2.6393
11.7655
23.1698



d13
4.4030
1.9277
2.5015











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−12.88044


2
5
10.10697


3
12
20.54116









NUMERICAL EXAMPLE I-13
The zoom lens system of Numerical Example I-13 corresponds to Embodiment I-13 shown in FIG. 37. Table I-37 shows the surface data of the zoom lens system of Numerical Example I-13. Table I-38 shows the aspherical data. Table I-39 shows various data.







TABLE I-37







(Surface data)











Surface number
r
d
nd
vd














Object surface
∞





 1*
65.26800
1.06000
1.85280
39.0


 2*
5.43100
1.50400


 3*
8.75800
1.75000
1.99537
20.7


 4
14.38100
Variable


 5*
4.34800
2.50000
1.80359
40.8


 6
154.36000
0.00000


 7
154.36000
0.40000
1.80518
25.5


 8
3.78600
0.47700


 9
12.80100
1.14400
1.77250
49.6


10
−16.77300
0.30000


11 (Diaphragm)
∞
Variable


12*
−21.93400
1.33400
1.60602
57.4


13*
−8.75000
Variable


14
∞
0.78000
1.51680
64.2


15
∞
(BF)


Image surface
∞
















TABLE I-38





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = 1.92866E−06, A6 = −2.59806E−07,



A8 = 0.00000E+00, A10 = 0.00000E+00, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.12457E+00, A4 = 9.65240E−04, A6 = 7.72275E−06,



A8 = −3.45452E−06, A10 = 2.84301E−07, A12 = −9.70703E−09,



A14 = 1.17484E−10



Surface No. 3



K = 0.00000E+00, A4 = 2.90216E−04, A6 = 7.30560E−06,



A8 = −2.22065E−06, A10 = 1.70191E−07, A12 = −5.52242E−09,



A14 = 6.43532E−11



Surface No. 5



K = −2.32994E−01, A4 = −3.37630E−04, A6 = 2.79870E−06,



A8 = −3.71831E−06, A10 = 3.04308E−07, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 12



K = 0.00000E+00, A4 = −3.98270E−04, A6 = 1.52053E−05,



A8 = −8.64592E−07, A10 = 2.48416E−07, A12 = −4.83203E−09,



A14 = 0.00000E+00



Surface No. 13



K = 0.00000E+00, A4 = 1.48124E−04, A6 = −1.28334E−05,



A8 = 2.23453E−06, A10 = 2.99201E−08, A12 = 1.47871E−09,



A14 = 0.00000E+00

















TABLE I-39





(Various data)







Zooming ratio 5.64043













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.5204
11.0121
25.4968



F-number
2.92132
5.03801
7.49395



View angle
41.3621
18.1278
7.9812



Image height
3.6000
3.6000
3.6000



Overall length
33.3391
30.6877
39.6399



of lens system



BF
0.90466
0.88115
0.85890



d4
14.3758
4.8086
0.2000



d11
2.2899
11.5361
25.6839



d13
4.5197
2.2129
1.6481











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−11.17647


2
5
9.42887


3
12
23.13762









NUMERICAL EXAMPLE I-14
The zoom lens system of Numerical Example I-14 corresponds to Embodiment I-14 shown in FIG. 40. Table I-40 shows the surface data of the zoom lens system of Numerical Example I-14. Table I-41 shows the aspherical data. Table I-42 shows various data.







TABLE I-40







(Surface data)











Surface number
r
d
nd
vd














Object surface
∞





 1
105.88040
1.06000
1.85280
39.0


 2*
6.23376
1.50400


 3*
8.46665
1.75000
1.99537
20.7


 4
14.38100
Variable


 5*
6.15230
1.88160
1.68863
52.8


 6
−32.24219
0.10000


 7
8.16407
1.41330
1.83481
42.7


 8
−7.68828
0.01000
1.56732
42.8


 9
−7.68828
0.40000
1.71736
29.5


10
3.50287
0.98500


11 (Diaphragm)
∞
Variable


12*
−35.85802
1.33400
1.68863
52.8


13*
−10.16980
Variable


14
∞
0.28000
1.51680
64.2


15
∞
0.50000


16
∞
0.50000
1.51680
64.2


17
∞
(BF)


Image surface
∞
















TABLE I-41





(Aspherical data)

















Surface No. 2



K = −1.45141E+00, A4 = 7.96134E−04, A6 = 4.37615E−06,



A8 = −3.49951E−06, A10 = 2.82588E−07, A12 = −9.66903E−09,



A14 = 1.19040E−10



Surface No. 3



K = 0.00000E+00, A4 = 1.49295E−04, A6 = 1.49208E−06,



A8 = −2.19105E−06, A10 = 1.69875E−07, A12 = −5.56163E−09,



A14 = 6.49477E−11



Surface No. 5



K = 0.00000E+00, A4 = −8.65393E−04, A6 = −1.02618E−05,



A8 = −2.85667E−07, A10 = −1.61372E−07, A12 = 3.29730E−08,



A14 = −1.69534E−09



Surface No. 12



K = 0.00000E+00, A4 = 6.56179E−04, A6 = −9.84731E−08,



A8 = −1.07336E−06, A10 = 1.54031E−07, A12 = −4.49727E−09,



A14 = 0.00000E+00



Surface No. 13



K = 0.00000E+00, A4 = 8.30977E−04, A6 = −9.79112E−06,



A8 = 1.21591E−06, A10 = 1.19379E−08, A12 = −1.54444E−09,



A14 = 0.00000E+00

















TABLE I-42





(Various data)







Zooming ratio 4.63150













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
5.7864
11.4767
26.7998



F-number
3.02921
4.55167
6.53395



View angle
35.3303
18.1967
8.0769



Image height
3.8000
3.8000
3.8000



Overall length
33.1983
29.8606
38.1607



of lens system



BF
0.40164
0.34662
0.39982



d4
14.1463
5.2646
0.2000



d11
2.6360
8.5161
23.1569



d13
4.2965
4.0154
2.6861











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−14.29099


2
5
10.14036


3
12
20.18727









NUMERICAL EXAMPLE I-15
The zoom lens system of Numerical Example I-15 corresponds to Embodiment I-15 shown in FIG. 43. Table I-43 shows the surface data of the zoom lens system of Numerical Example I-15. Table I-44 shows the aspherical data. Table I-45 shows various data.







TABLE I-43







(Surface data)











Surface number
r
d
nd
vd














Object surface
∞





 1
67.11508
1.06000
1.85280
39.0


 2*
5.93643
1.50400


 3*
8.67244
1.75000
1.99537
20.7


 4
14.38100
Variable


 5*
6.04644
1.50070
1.68863
52.8


 6
−31.45638
0.10000


 7
8.02778
1.52600
1.83481
42.7


 8
−7.47219
0.01000
1.56732
42.8


 9
−7.47219
0.40000
1.71736
29.5


10
3.50287
0.98500


11 (Diaphragm)
∞
Variable


12*
−107.31420
1.33400
1.68863
52.8


13*
−12.02005
Variable


14
∞
0.28000
1.51680
64.2


15
∞
0.50000


16
∞
0.50000
1.51680
64.2


17
∞
(BF)


Image surface
∞
















TABLE I-44





(Aspherical data)

















Surface No. 2



K = −1.40725E+00, A4 = 8.24033E−04, A6 = 7.65767E−06,



A8 = −3.31358E−06, A10 = 2.82628E−07, A12 = −9.81656E−09,



A14 = 1.18891E−10



Surface No. 3



K = 0.00000E+00, A4 = 1.68357E−04, A6 = 3.35244E−06,



A8 = −2.18545E−06, A10 = 1.71187E−07, A12 = −5.50659E−09,



A14 = 6.20096E−11



Surface No. 5



K = 0.00000E+00, A4 = −9.09029E−04, A6 = −1.11663E−05,



A8 = −3.76602E−07, A10 = −1.69774E−07, A12 = 3.26901E−08,



A14 = −1.59319E−09



Surface No. 12



K = 0.00000E+00, A4 = 4.98372E−05, A6 = 2.36765E−05,



A8 = −1.16504E−06, A10 = 1.33583E−07, A12 = −4.07360E−09,



A14 = 0.00000E+00



Surface No. 13



K = 0.00000E+00, A4 = 5.23496E−04, A6 = −1.18940E−05,



A8 = 1.57366E−06, A10 = 3.05910E−08, A12 = −2.51680E−09,



A14 = 0.00000E+00

















TABLE I-45





(Various data)







Zooming ratio 4.97350













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.9440
10.9999
24.5887



F-number
2.86849
4.47181
6.02934



View angle
40.5984
18.7047
8.5997



Image height
3.8000
3.8000
3.8000



Overall length
33.3276
28.0492
36.0296



of lens system



BF
0.42910
0.35221
0.38698



d4
15.4234
4.4723
0.2000



d11
2.6360
7.7519
21.3068



d13
3.3894
4.0230
2.6861











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−13.26565


2
5
9.49125


3
12
19.54515









NUMERICAL EXAMPLE I-16
The zoom lens system of Numerical Example I-16 corresponds to Embodiment I-16 shown in FIG. 46. Table I-46 shows the surface data of the zoom lens system of Numerical Example I-16. Table I-47 shows the aspherical data. Table I-48 shows various data.







TABLE I-46







(Surface data)











Surface number
r
d
nd
vd














Object surface
∞





 1
66.99756
1.06000
1.85280
39.0


 2*
5.92693
1.50400


 3*
8.66891
1.75000
1.99537
20.7


 4
14.38100
Variable


 5*
6.04238
1.47300
1.68863
52.8


 6
−31.84957
0.10000


 7
7.97831
1.52260
1.83481
42.7


 8
−7.42943
0.01000
1.56732
42.8


 9
−7.42943
0.40000
1.71736
29.5


10
3.50287
0.98500


11 (Diaphragm)
∞
Variable


12*
−124.53680
1.33400
1.68863
52.8


13*
−11.63546
Variable


14
∞
0.28000
1.51680
64.2


15
∞
0.50000


16
∞
0.50000
1.51680
64.2


17
∞
(BF)


Image surface
∞
















TABLE I-47





(Aspherical data)

















Surface No. 2



K = −1.40989E+00, A4 = 8.22545E−04, A6 = 7.45234E−06,



A8 = −3.31504E−06, A10 = 2.82561E−07, A12 = −9.82067E−09,



A14 = 1.18701E−10



Surface No. 3



K = 0.00000E+00, A4 = 1.68883E−04, A6 = 3.36000E−06,



A8 = −2.18923E−06, A10 = 1.71073E−07, A12 = −5.50897E−09,



A14 = 6.19721E−11



Surface No. 5



K = 0.00000E+00, A4 = −9.17209E−04, A6 = −1.14922E−05,



A8 = −3.86295E−07, A10 = −1.69119E−07, A12 = 3.29873E−08,



A14 = −1.52387E−09



Surface No. 12



K = 0.00000E+00, A4 = 3.44434E−05, A6 = 2.52919E−05,



A8 = −1.15251E−06, A10 = 1.31557E−07, A12 = −3.96388E−09,



A14 = 0.00000E+00



Surface No. 13



K = 0.00000E+00, A4 = 5.44445E−04, A6 = −1.16407E−05,



A8 = 1.60284E−06, A10 = 3.33080E−08, A12 = −2.54996E−09,



A14 = 0.00000E+00

















TABLE I-48





(Various data)







Zooming ratio 4.94889













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.8230
9.8989
23.8686



F-number
2.92673
4.29935
6.02423



View angle
41.2896
20.6747
8.8279



Image height
3.8000
3.8000
3.8000



Overall length
33.3145
27.6252
35.5444



of lens system



BF
0.42965
0.35867
0.38805



d4
15.5588
5.1363
0.2000



d11
2.6360
6.7258
20.8516



d13
3.2715
3.9858
2.6861











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−13.24063


2
5
9.45447


3
12
18.54849









NUMERICAL EXAMPLE I-17
The zoom lens system of Numerical Example I-17 corresponds to Embodiment I-17 shown in FIG. 49. Table I-49 shows the surface data of the zoom lens system of Numerical Example I-17. Table I-50 shows the aspherical data. Table I-51 shows various data.







TABLE I-49







(Surface data)











Surface number
r
d
nd
vd














Object surface
∞





 1
42.52694
1.06000
1.85280
39.0


 2*
5.68093
1.50400


 3*
8.67288
1.75000
1.99537
20.7


 4
14.38100
Variable


 5*
4.36525
2.50000
1.80359
40.8


 6
−71.54269
0.40000
1.80518
25.5


 7
3.82048
0.47690


 8
17.07332
1.14410
1.77250
49.6


 9
−16.77307
0.30000


10 (Diaphragm)
∞
Variable


11*
−80.54801
1.33400
1.68863
52.8


12*
−11.93863
Variable


13
∞
0.28000
1.51680
64.2


14
∞
0.50000


15
∞
0.50000
1.51680
64.2


16
∞
(BF)


Image surface
∞
















TABLE I-50





(Aspherical data)

















Surface No. 2



K = −1.34333E+00, A4 = 8.43676E−04, A6 = 3.59200E−06,



A8 = −3.29172E−06, A10 = 2.85355E−07, A12 = −9.76033E−09,



A14 = 1.18324E−10



Surface No. 3



K = 0.00000E+00, A4 = 1.80977E−04, A6 = 4.80208E−06,



A8 = −2.19007E−06, A10 = 1.70661E−07, A12 = −5.49780E−09,



A14 = 6.36027E−11



Surface No. 5



K = −2.27637E−01, A4 = −3.76705E−04, A6 = 2.78981E−05,



A8 = −8.69457E−06, A10 = 6.43727E−07, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 11



K = 0.00000E+00, A4 = −1.52329E−04, A6 = −2.60128E−06,



A8 = −7.83396E−07, A10 = 1.95923E−07, A12 = −3.84055E−09,



A14 = 0.00000E+00



Surface No. 12



K = 0.00000E+00, A4 = 3.23671E−05, A6 = −1.87291E−05,



A8 = 1.47652E−06, A10 = 3.09913E−08, A12 = 7.47159E−10,



A14 = 0.00000E+00

















TABLE I-51





(Various data)







Zooming ratio 4.53687













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
5.2926
11.4781
24.0120



F-number
3.04251
4.88869
6.20669



View angle
36.5361
18.3530
9.0055



Image height
3.8000
3.8000
3.8000



Overall length
33.5962
31.4434
38.5006



of lens system



BF
0.42600
0.35251
0.38880



d4
14.0464
5.0701
0.2000



d10
2.6360
11.1355
23.4767



d12
4.7387
3.1363
2.6861











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−13.49971


2
5
10.36991


3
11
20.19342









NUMERICAL EXAMPLE I-18
The zoom lens system of Numerical Example I-18 corresponds to Embodiment I-18 shown in FIG. 52. Table I-52 shows the surface data of the zoom lens system of Numerical Example I-18. Table I-53 shows the aspherical data. Table I-54 shows various data.







TABLE I-52







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1
42.70102
1.06000
1.85280
39.0



 2*
5.57066
1.50400



 3*
8.68434
1.75000
1.99537
20.7



 4
14.38100
Variable



 5*
4.39069
2.50000
1.80359
40.8



 6
−70.26053
0.40000
1.80518
25.5



 7
3.79211
0.47690



 8
14.95528
1.14410
1.77250
49.6



 9
−16.77307
0.30000



10(Diaphragm)
∞
Variable



11*
75.54035
1.33400
1.68863
52.8



12*
−16.87201
Variable



13
∞
0.28000
1.51680
64.2



14
∞
0.50000



15
∞
0.50000
1.51680
64.2



16
∞
(BF)



Image surface
∞

















TABLE I-53





(Aspherical data)

















Surface No. 2



K = −1.10895E+00, A4 = 9.80110E−04, A6 = 5.37935E−06,



A8 = −3.31816E−06, A10 = 2.82550E−07, A12 = −9.79287E−09,



A14 = 1.19194E−10



Surface No. 3



K = 0.00000E+00, A4 = 3.16620E−04, A6 = 4.52889E−06,



A8 = −2.24766E−06, A10 = 1.71664E−07, A12 = −5.47562E−09,



A14 = 6.19684E−11



Surface No. 5



K = −2.23619E−01, A4 = −3.15552E−04, A6 = 4.51483E−06,



A8 = −3.56603E−06, A10 = 2.70787E−07, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 11



K = 0.00000E+00, A4 = −5.09159E−04, A6 = 3.02877E−06,



A8 = −1.27336E−06, A10 = 1.46792E−07, A12 = −1.63257E−09,



A14 = 0.00000E+00



Surface No. 12



K = 0.00000E+00, A4 = −5.90562E−04, A6 = −3.70497E−06,



A8 = 3.88633E−07, A10 = 2.62396E−08, A12 = 1.43856E−09,



A14 = 0.00000E+00

















TABLE I-54





(Various data)







Zooming ratio 4.64119













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.9861
11.0001
23.1414



F-number
2.95520
4.87262
6.08135



View angle
39.9116
19.5373
9.4812



Image height
3.8000
3.8000
3.8000



Overall length
33.4464
31.4551
38.2247



of lens system



BF
0.41065
0.34276
0.37653



d4
14.2276
5.5541
0.2000



d10
2.6360
11.7632
23.2131



d12
4.4231
2.0461
2.6861











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−12.94754


2
5
10.15020


3
11
20.14624









NUMERICAL EXAMPLE I-19
The zoom lens system of Numerical Example I-19 corresponds to Embodiment I-19 shown in FIG. 55. Table I-55 shows the surface data of the zoom lens system of Numerical Example I-19. Table I-56 shows the aspherical data. Table I-57 shows various data.







TABLE I-55







(Surface data)











Surface number
r
d
nd
vd





Object surface
∞





 1
35.42244
1.06000
1.85280
39.0


 2*
5.32451
1.50400


 3*
8.65227
1.75000
1.99537
20.7


 4
14.38100
Variable


 5*
4.27762
2.50000
1.80359
40.8


 6
−494.42940
0.40000
1.80518
25.5


 7
3.70655
0.47690


 8
17.62745
1.14410
1.77250
49.6


 9
−16.77307
0.30000


10(Diaphragm)
∞
Variable


11*
46.41221
1.33400
1.68863
52.8


12*
−19.53072
Variable


13
∞
0.28000
1.51680
64.2


14
∞
0.50000


15
∞
0.50000
1.51680
64.2


16
∞
(BF)


Image surface
∞
















TABLE I-56





(Aspherical data)

















Surface No. 2



K = −1.02588E+00, A4 = 1.00837E−03, A6 = −1.35772E−05,



A8 = −2.98948E−06, A10 = 2.92183E−07, A12 = −9.57272E−09,



A14 = 1.06236E−10



Surface No. 3



K = 0.00000E+00, A4 = 3.49391E−04, A6 = −3.31939E−06,



A8 = −2.26288E−06, A10 = 1.85846E−07, A12 = −5.62099E−09,



A14 = 5.85455E−11



Surface No. 5



K = −2.28466E−01 , A4 = −3.11847E−04, A6 = −9.62733E−06,



A8 = −9.01185E−08, A10 = 1.56445E−08, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 11



K = 0.00000E+00, A4 = −8.40972E−04, A6 = 8.55587E−05,



A8 = −5.50326E−06, A10 = 9.49363E−08, A12 = 1.92040E−09,



A14 = 0.00000E+00



Surface No. 12



K = 0.00000E+00, A4 = −8.48616E−04, A6 = 5.97906E−05,



A8 = −1.72782E−06, A10 = −1.09232E−07, A12 = 5.79395E−09,



A14 = 0.00000E+00

















TABLE I-57





(Various data)







Zooming ratio 5.67343













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
5.2010
12.0508
29.5073



F-number
3.08108
5.36923
7.77372



View angle
37.3653
17.8273
7.4457



Image height
3.8000
3.8000
3.8000



Overall length
33.5190
33.3381
46.5304



of lens system



BF
0.41574
0.34122
0.36643



d4
13.9022
5.5477
0.2000



d10
2.6360
13.4442
31.5289



d12
4.8160
2.2560
2.6861











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−12.61134


2
5
10.47662


3
11
20.12769









NUMERICAL EXAMPLE I-20
The zoom lens system of Numerical Example I-20 corresponds to Embodiment I-20 shown in FIG. 58. Table I-58 shows the surface data of the zoom lens system of Numerical Example I-20. Table I-59 shows the aspherical data. Table I-60 shows various data.







TABLE I-58







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1*
121.77400
1.35000
1.88300
40.8



 2*
4.59300
1.66900



 3
7.05800
1.60000
1.92287
18.9



 4
11.92800
Variable



 5*
4.18500
2.00000
1.77250
49.6



 6
10.87900
0.50000
1.64769
33.8



 7
3.66100
0.48000



 8
8.24900
0.50000
1.76183
26.5



 9
3.97900
2.00000
1.60311
60.6



10
−10.51800
0.30000



11(Diaphragm)
∞
Variable



12
45.65100
1.60000
1.60311
60.6



13
−23.91400
Variable



14
∞
1.40000
1.51633
64.1



15
∞
(BF)



Image surface
∞

















TABLE I-59





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = 3.18638E−04, A6 = −4.73036E−06,



A8 = 3.76995E−08, A10 = 0.00000E+00



Surface No. 2



K = −1.47866E+00, A4 = 1.64875E−03, A6 = 1.02150E−05,



A8 = −4.99629E−07, A10 = 2.42134E−08



Surface No. 5



K = −4.49065E−01, A4 = −9.97316E−05, A6 = 1.40893E−06,



A8 = 0.00000E+00, A10 = 0.00000E+00

















TABLE I-60





(Various data)







Zooming ratio 4.80185













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
3.8997
10.4303
18.7259



F-number
2.80200
5.33669
6.11778



View angle
46.5205
19.4974
10.9872



Image height
3.6000
3.6000
3.6000



Overall length
30.7959
30.3826
37.2037



of lens system



BF
1.02501
1.00139
1.01023



d4
11.4400
2.9456
0.1500



d11
1.2672
11.9186
21.1596



d13
3.6647
1.1180
1.4849











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−8.66678


2
5
8.54395


3
12
26.24759









NUMERICAL EXAMPLE I-21
The zoom lens system of Numerical Example I-21 corresponds to Embodiment I-21 shown in FIG. 61. Table I-61 shows the surface data of the zoom lens system of Numerical Example I-21. Table I-62 shows the aspherical data. Table I-63 shows various data.







TABLE I-61







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1*
54.56700
1.35000
1.88300
40.8



 2*
4.76000
1.94200



 3
7.01500
1.60000
1.92287
18.9



 4
10.72700
Variable



 5*
4.23600
2.00000
1.77250
49.6



 6
9.39300
0.50000
1.64769
33.8



 7
3.64800
0.48000



 8
8.26300
0.50000
1.76183
26.5



 9
4.00600
2.00000
1.60311
60.6



10
−11.64200
0.30000



11(Diaphragm)
∞
Variable



12
34.68300
1.60000
1.60311
60.6



13
−27.64900
Variable



14
∞
1.40000
1.51633
64.1



15
∞
(BF)



Image surface
∞

















TABLE I-62





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = 3.61641E−04, A6 = −5.02438E−06,



A8 = 2.59231E−08, A10 = 0.00000E+00



Surface No. 2



K = −1.53173E+00, A4 = 1.65738E−03, A6 = 2.09911E−05,



A8 = −1.66275E−07, A10 = −3.69650E−09



Surface No. 5



K = −4.39707E−01, A4 = −2.39404E−05, A6 = 2.26135E−06,



A8 = 0.00000E+00, A10 = 0.00000E+00

















TABLE I-63





(Various data)







Zooming ratio 4.78672













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.2681
10.4357
20.4301



F-number
2.86927
5.02409
6.20159



View angle
43.4719
19.4769
10.0548



Image height
3.6000
3.6000
3.6000



Overall length
31.5753
31.0990
39.8252



of lens system



BF
1.02817
1.00170
1.03473



d4
11.4400
2.8570
0.1500



d11
1.2161
9.8230
23.2974



d13
4.2190
3.7453
1.6711











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−9.34613


2
5
9.08938


3
12
25.75745









NUMERICAL EXAMPLE I-22
The zoom lens system of Numerical Example I-22 corresponds to Embodiment I-22 shown in FIG. 64. Table I-64 shows the surface data of the zoom lens system of Numerical Example I-22. Table I-65 shows the aspherical data. Table I-66 shows various data.







TABLE I-64 







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1*
34.18200
1.35000
1.88300
40.8



 2*
4.69900
1.88700



 3
7.07000
1.60000
1.92287
18.9



 4
10.87800
Variable



 5*
4.25100
2.00000
1.77250
49.6



 6
8.92800
0.50000
1.64769
33.8



 7
3.69800
0.48000



 8
8.66500
0.50000
1.76183
26.5



 9
4.04000
2.00000
1.60311
60.6



10
−12.32600
0.30000



11(Diaphragm)
∞
Variable



12
26.45400
1.60000
1.60311
60.6



13
−48.99600
Variable



14
∞
1.40000
1.51633
64.1



15
∞
(BF)



Image surface
∞

















TABLE I-65 





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = 3.62205E−04, A6 = −5.63958E−06,



A8 = 3.53569E−08, A10 = 0.00000E+00



Surface No. 2



K = −1.52605E+00, A4 = 1.70369E−03, A6 = 2.17529E−05,



A8 = −5.40577E−07, A10 = 8.14121E−09



Surface No. 5



K = −4.35512E−01, A4 = −8.44450E−07, A6 = 3.99899E−06,



A8 = 0.00000E+00, A10 = 0.00000E+00

















TABLE I-66





(Various data)







Zooming ratio 4.76804













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.7145
10.4216
22.4791



F-number
2.82795
4.62162
6.42143



View angle
39.1095
19.4169
9.1025



Image height
3.6000
3.6000
3.6000



Overall length
31.8271
31.1332
41.1670



of lens system



BF
1.03932
1.00578
0.97275



d4
11.4400
3.4367
0.1500



d11
0.8955
8.6718
24.7468



d13
4.8353
4.4019
1.6804











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−10.05331


2
5
9.42654


3
12
28.71276









NUMERICAL EXAMPLE I-23
The zoom lens system of Numerical Example I-23 corresponds to Embodiment I-23 shown in FIG. 67. Table I-67 shows the surface data of the zoom lens system of Numerical Example I-23. Table I-68 shows the aspherical data. Table I-69 shows various data.







TABLE I-67







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1*
132.95400
1.35000
1.88300
40.8



 2*
4.68700
1.46800



 3
6.81900
1.60000
1.92287
18.9



 4
11.04200
Variable



 5*
4.17000
2.00000
1.77632
52.6



 6
10.88700
0.50000
1.64619
31.8



 7
3.66300
0.48000



 8
8.27600
0.50000
1.76287
27.7



 9
4.01800
2.00000
1.60281
56.0



10
−11.07600
0.30000



11 (Diaphragm)
∞
Variable



12
−90.89600
1.60000
1.60311
60.6



13
−17.48600
Variable



14
∞
1.40000
1.51633
64.1



15
∞
(BF)



Image surface
∞

















TABLE I-68





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = 2.44936E−04, A6 = −4.54400E−06,



A8 = 5.72566E−08, A10 = 0.00000E+00



Surface No. 2



K = −1.48880E+00, A4 = 1.58237E−03, A6 = 2.31084E−06,



A8 = −5.39884E−07, A10 = 4.21354E−08



Surface No. 5



K = −4.35869E−01, A4 = −7.86886E−05, A6 = −3.25838E−06,



A8 = 0.00000E+00, A10 = 0.00000E+00

















TABLE I-69





(Various data)







Zooming ratio 5.57548













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.3036
10.4658
23.9944



F-number
2.92255
5.16214
7.21745



View angle
43.8656
19.5147
8.6343



Image height
3.6000
3.6000
3.6000



Overall length
31.2161
30.7032
41.9501



of lens system



BF
1.05074
1.06124
1.01753



d4
11.4400
3.5088
0.1500



d11
0.9832
10.2556
26.1962



d13
4.5442
2.6796
1.3884











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−8.59764


2
5
8.56522


3
12
35.60713









NUMERICAL EXAMPLE I-24
The zoom lens system of Numerical Example I-24 corresponds to Embodiment I-24 shown in FIG. 70. Table I-70 shows the surface data of the zoom lens system of Numerical Example I-24. Table I-71 shows the aspherical data. Table I-72 shows various data.







TABLE I-70







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1*
38.98800
1.35000
1.88300
40.8



 2*
4.84400
1.42500



 3
6.47600
1.60000
1.92287
18.9



 4
9.52600
Variable



 5*
4.20800
2.00000
1.78129
58.0



 6
9.08000
0.50000
1.64147
23.9



 7
3.67300
0.48000



 8
8.42900
0.50000
1.75881
27.4



 9
4.04600
2.00000
1.60469
40.7



10
−12.41000
0.30000



11 (Diaphragm)
∞
Variable



12
110.98100
1.60000
1.60311
60.6



13
−22.55600
Variable



14
∞
1.40000
1.51633
64.1



15
∞
(BF)



Image surface
∞

















TABLE I-71





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = 3.22213E−04, A6 = −5.80780E−06,



A8 = 5.15896E−08, A10 = 0.00000E+00



Surface No. 2



K = −1.51520E+00, A4 = 1.64681E−03, A6 = 1.57014E−05,



A8 = −4.00394E−07, A10 = 1.75249E−08



Surface No. 5



K = −4.40198E−01, A4 = 1.03406E−06, A6 = −1.84751E−06,



A8 = 0.00000E+00, A10 = 0.00000E+00

















TABLE I-72





(Various data)







Zooming ratio 5.10625













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.8387
10.4090
24.7076



F-number
2.88073
4.54052
6.64735



View angle
38.8209
19.4873
8.3429



Image height
3.6000
3.6000
3.6000



Overall length
31.2899
29.5852
41.1813



of lens system



BF
1.06325
1.06953
0.97479



d4
11.4400
3.4674
0.1500



d11
0.9838
6.4142
25.1290



d13
4.6478
5.4791
1.7725











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−9.96310


2
5
8.98371


3
12
31.22300









The following Table I-73 shows the corresponding values to the individual conditions in the zoom lens systems of Numerical Examples. Here, in Table I-73, YW is defined as
an amount of movement in a direction perpendicular to the optical axis at the time of maximum blur compensation in the second lens unit with a focal length fW of the entire system at a wide-angle limit, and
indicates a value obtained in a state that the zoom lens system is at a wide-angle limit. That is, a corresponding value (YW/YT)/(fT/fW) at the time of Y=YW (f=fW) in the condition formula (3) was obtained.







TABLE I-73





(Values corresponding to conditions)

















Example















Condition
I-1
I-2
I-3
I-4
I-5
I-6
I-7
I-8



















(26)
fL2/fT
0.84
0.69
0.74
0.80
0.80
0.71
0.71
0.67


(1)
D2/(Ir × Z2)
0.19
0.21
0.21
0.22
0.21
0.23
0.18
0.18


(2)
YW
0.0397
0.0419
0.0419
0.0419
0.0511
0.0479
0.0423
0.0430



YT
0.0820
0.0848
0.0838
0.0838
0.1025
0.0935
0.0847
0.0860


(3)
(YW/YT)/(fW/fT)
0.096
0.103
0.105
0.106
0.104
0.111
0.093
0.090


(4)
(D2T − D2W)/(Ir × Z2)
0.21
0.22
0.23
0.23
0.23
0.25
0.21
0.20


(5)
fG1/fG2
−1.19
−1.22
−1.20
−1.20
−1.20
−1.27
−1.20
−1.19


(6)
fG1/fG3
−0.57
−0.58
−0.57
−0.57
−0.58
−0.64
−0.58
−0.58


(7)
fG2/fG3
0.48
0.48
0.48
0.48
0.48
0.50
0.48
0.49


(8)
fG1/fT
−0.53
−0.53
−0.52
−0.52
−0.52
−0.54
−0.46
−0.45


(9)
fG2/fT
0.44
0.43
0.44
0.44
0.44
0.43
0.39
0.37


(10)
fG3/fT
0.92
0.91
0.91
0.91
0.90
0.85
0.81
0.77


(11)
(D1W + D2W)/(D1T + D2T)
0.75
0.75
0.73
0.73
0.73
0.72
0.64
0.61


(12)
(D2T − D2W)/fW
4.67
4.22
4.26
4.24
4.30
3.99
4.92
5.09


(13)
(D2T − D2W)/fT
0.93
0.88
0.90
0.90
0.90
0.86
0.92
0.92


(14)
D1T/Ir
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05


(15)
(fW/Ir) × (fW/fT)
0.22
0.25
0.25
0.25
0.25
0.29
0.23
0.22


(16)
tan(ωW) × Z
5.23
4.59
4.53
4.51
4.58
3.76
5.09
5.09


(17)
|fW × fG1|/Ir2
3.23
3.63
3.60
3.61
3.60
4.56
3.63
3.72


(18)
(fW · fG2)/Ir2
2.73
2.99
3.01
3.02
2.99
3.59
3.04
3.12


(19)
(DG1 + DG2 + DG3)/fT
0.52
0.50
0.50
0.50
0.48
0.46
0.45
0.42


(20)
(FW × FT)/Z
3.54
3.82
3.75
3.77
3.68
3.86
3.76
3.86


(21)
LT/(Ir × Z)
1.95
2.06
2.09
2.10
2.04
2.19
1.91
1.90


(22)
(DG2 + (DG2A))/(DG2A)
12.92
12.93
12.93
12.93
12.67
13.49
12.93
12.93


(23)
fL2/fG1
−1.59
−1.32
−1.41
−1.53
−1.53
−1.31
−1.52
−1.51


(24)
R2F/fT
0.44
0.37
0.43
0.42
0.42
0.38
0.37
0.35


(25)
R2R/fT
0.82
0.71
0.80
0.80
0.80
0.74
0.71
0.67


(27)
fL3/fG2
0.68
0.77
0.68
0.64
0.68
0.65
0.67
0.67


(28)
fG2a/fG2b
—
—
—
—
—
—
—
—


(29)
(1 − m2T) × m3T
2.70
2.70
2.72
2.71
2.71
2.64
3.04
3.14


(30)
m2T/m2W
4.63
4.47
4.38
4.39
4.40
4.13
4.43
4.50


(31)
(1 − m2T/m2W) × (m3T/m3W)
−3.94
−3.72
−3.67
−3.66
−3.70
−3.49
−4.15
4.30


(32)
(1 − m2W) × m3W
1.11
1.14
1.14
1.15
1.14
1.12
1.14
1.14



fT/fW
5.02
4.79
4.75
4.73
4.78
4.61
5.36
5.53



ωW
46.160
43.774
43.658
43.630
43.786
39.200
43.535
42.612












Example















Condition
I-9
I-10
I-11
I-12
I-13
I-14
I-15
I-16



















(26)
fL2/fT
0.88
0.94
0.89
0.81
0.76
0.67
0.77
0.80


(1)
D2/(Ir × Z2)
0.24
0.19
0.20
0.23
0.17
0.23
0.19
0.19


(2)
YW
0.0524
0.0413
0.0426
0.0476
0.0404
0.0533
0.0458
0.0453



YT
0.1038
0.0829
0.0854
0.0933
0.0841
0.1044
0.0972
0.0966


(3)
(YW/YT)/(fW/fT)
0.107
0.106
0.107
0.109
0.085
0.110
0.095
0.095


(4)
(D2T − D2W)/(Ir × Z2)
0.25
0.21
0.22
0.25
0.19
0.25
0.20
0.20


(5)
fG1/fG2
−1.37
−1.27
−1.27
−1.27
−1.19
−1.41
−1.40
−1.40


(6)
fG1/fG3
−0.59
−0.65
−0.58
−0.63
−0.48
−0.71
−0.68
−0.71


(7)
fG2/fG3
0.43
0.51
0.46
0.49
0.41
0.50
0.49
0.51


(8)
fG1/fT
−0.49
−0.59
−0.57
−0.55
−0.44
−0.53
−0.54
−0.55


(9)
fG2/fT
0.36
0.47
0.45
0.44
0.37
0.38
0.39
0.40


(10)
fG3/fT
0.83
0.92
0.98
0.88
0.91
0.75
0.79
0.78


(11)
(D1W + D2W)/(D1T + D2T)
0.70
0.81
0.80
0.72
0.64
0.72
0.84
0.86


(12)
(D2T − D2W)/fW
3.57
4.21
4.06
4.12
5.18
3.55
3.78
3.78


(13)
(D2T − D2W)/fT
0.76
0.89
0.87
0.88
0.92
0.77
0.76
0.76


(14)
D1T/Ir
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05


(15)
(fW/Ir) × (fW/fT)
0.33
0.24
0.25
0.28
0.21
0.33
0.26
0.26


(16)
tan(ωW) × Z
3.36
4.54
4.10
3.67
4.97
3.29
4.29
4.38


(17)
|fW × fG1|/Ir2
5.79
3.45
3.78
4.44
3.50
5.73
4.54
4.42


(18)
(fW · fG2)/Ir2
4.22
2.72
2.97
3.49
2.95
4.06
3.25
3.16


(19)
(DG1 + DG2 + DG3)/fT
0.37
0.51
0.48
0.44
0.40
0.35
0.37
0.38


(20)
(FW × FT)/Z
4.61
3.82
3.83
3.89
3.88
4.27
3.48
3.56


(21)
LT/(Ir × Z)
2.22
1.89
1.97
2.15
1.85
2.17
1.91
1.89


(22)
(DG2 + (DG2A))/(DG2A)
17.83
16.07
16.07
16.07
16.07
4.86
4.59
4.56


(23)
fL2/fG1
−1.80
−1.58
−1.54
−1.47
−1.74
−1.26
−1.44
−1.44


(24)
R2F/fT
0.27
0.43
0.41
0.37
0.34
0.32
0.35
0.36


(25)
R2R/fT
0.37
0.72
0.68
0.62
0.56
0.54
0.58
0.60


(27)
fL3/fG2
0.67
0.56
0.55
0.53
0.59
0.75
0.79
0.79


(28)
fG2a/fG2b
—
—
—
—
—
—
—
—


(29)
(1 − m2T) × m3T
2.86
2.51
2.58
2.61
3.17
2.69
2.65
2.59


(30)
m2T/m2W
4.41
4.05
4.09
4.12
4.84
4.18
4.74
4.74


(31)
(1 − m2T/m2W) × (m3T/m3W)
−3.66
−3.55
−3.53
−3.53
−4.48
−3.52
−3.92
−3.90


(32)
(1 − m2W) × m3W
1.20
1.07
1.11
1.10
1.17
1.14
1.13
1.11



fT/fW
4.73
4.71
4.67
4.66
5.64
4.63
4.97
4.95



ωW
35.441
43.934
41.314
38.201
41.362
35.418
40.763
41.506












Example















Condition
I-17
I-18
I-19
I-20
I-21
I-22
I-23
I-24



















(26)
fL2/fT
0.79
0.83
0.64
0.86
0.89
0.81
0.68
0.71


(1)
D2/(Ir × Z2)
0.24
0.23
0.22
0.21
0.24
0.25
0.20
0.23


(2)
YW
0.0507
0.0480
0.0500
0.0334
0.0373
0.0408
0.0341
0.0400



YT
0.0974
0.0940
0.0989
0.0650
0.0707
0.0762
0.0678
0.0771


(3)
(YW/YT)/(fW/fT)
0.115
0.110
0.089
0.107
0.110
0.112
0.090
0.102


(4)
(D2T − D2W)/(Ir × Z2)
0.27
0.25
0.24
0.24
0.27
0.29
0.23
0.26


(5)
fG1/fG2
−1.30
−1.28
−1.20
−1.01
−1.03
−1.07
−1.00
−1.11


(6)
fG1/fG3
−0.67
−0.64
−0.63
−0.33
−0.36
−0.35
−0.24
−0.32


(7)
fG2/fG3
0.51
0.50
0.52
0.33
0.35
0.33
0.24
0.29


(8)
fG1/fT
−0.56
−0.56
−0.43
−0.46
−0.46
−0.45
−0.36
−0.40


(9)
fG2/fT
0.43
0.44
0.36
0.46
0.44
0.42
0.36
0.36


(10)
fG3/fT
0.84
0.87
0.68
1.40
1.26
1.28
1.48
1.26


(11)
(D1W + D2W)/(D1T + D2T)
0.70
0.72
0.52
0.60
0.54
0.50
0.47
0.49


(12)
(D2T − D2W)/fW
3.94
4.13
5.56
5.10
5.17
5.06
5.86
4.99


(13)
(D2T − D2W)/fT
0.87
0.89
0.98
1.06
1.08
1.06
1.05
0.98


(14)
D1T/Ir
0.05
0.05
0.05
0.04
0.04
0.04
0.04
0.04


(15)
(fW/Ir) × (fW/fT)
0.31
0.28
0.24
0.23
0.25
0.27
0.21
0.26


(16)
tan(ωW) × Z
3.38
3.89
4.35
5.06
4.54
3.88
5.36
4.11


(17)
|fW × fG1|/Ir2
4.95
4.47
4.54
2.61
3.08
3.66
2.86
3.72


(18)
(fW · fG2)/Ir2
3.80
3.50
3.77
2.57
2.99
3.43
2.84
3.35


(19)
(DG1 + DG2 + DG3)/fT
0.42
0.44
0.34
0.62
0.59
0.53
0.48
0.46


(20)
(FW × FT)/Z
4.16
3.87
4.22
3.57
3.72
3.81
3.78
3.75


(21)
LT/(Ir × Z)
2.23
2.17
2.16
2.15
2.31
2.40
2.09
2.24


(22)
(DG2 + (DG2A))/(DG2A)
16.07
16.07
16.07
19.27
19.27
19.27
19.27
19.27


(23)
fL2/fG1
−1.41
−1.48
−1.50
−1.87
−1.95
−1.81
−1.90
−1.76


(24)
R2F/fT
0.36
0.38
0.29
0.38
0.34
0.31
0.28
0.26


(25)
R2R/fT
0.60
0.62
0.49
0.64
0.53
0.48
0.46
0.39


(27)
fL3/fG2
0.50
0.51
0.50
0.94
0.94
0.94
0.90
0.95


(28)
fG2a/fG2b
—
—
—
2.35
2.51
2.33
2.20
2.19


(29)
(1 − m2T) × m3T
2.58
2.58
3.13
3.02
3.03
3.09
3.70
3.36


(30)
m2T/m2W
3.95
4.12
4.89
4.33
4.23
4.14
5.03
4.55


(31)
(1 − m2T/m2W) × (m3T/m3W)
−3.39
−3.52
−4.51
−3.69
−3.65
−3.62
−4.47
−3.98


(32)
(1 − m2W) × m3W
1.09
1.09
1.09
1.22
1.20
1.21
1.32
1.27



fT/fW
4.54
4.64
5.67
4.80
4.79
4.77
5.58
5.11



ωW
36.651
39.994
37.452
46.521
43.472
39.109
43.866
38.821









NUMERICAL EXAMPLE II-1
The zoom lens system of Numerical Example II-1 corresponds to Embodiment II-1 shown in FIG. 73. Table II-1 shows the surface data of the zoom lens system of Numerical Example II-1. Table II-2 shows the aspherical data. Table II-3 shows various data.







TABLE II-1







(Surface data)











Surface number
r
d
nd
vd





Object surface
∞





 1*
188.92300
1.06000
1.85976
40.6


 2*
5.44500
1.73200


 3*
9.22600
1.98000
1.99537
20.7


 4
17.36000
Variable


 5*
4.94900
1.55900
1.80434
40.8


 6
117.92500
0.15300


 7
13.15200
1.05000
1.72916
54.7


 8
−21.47500
0.01000
1.56732
42.8


 9
−21.47500
0.40000
1.76182
26.6


10
3.74800
0.58300


11
22.33900
1.01500
1.69680
55.5


12
−19.41000
0.40000


13 (Diaphragm)
∞
Variable


14*
−116.08400
1.40700
1.68863
52.8


15*
−12.09600
Variable


16
∞
0.28000
1.51680
64.2


17
∞
0.50000


18
∞
0.50000
1.51680
64.2


19
∞
(BF)


Image surface
∞
















TABLE II-2





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = −1.00660E−06, A6 = 1.42786E−06,



A8 = −2.21841E−08, A10 = 4.62309E−11, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.50376E+00, A4 = 9.16971E−04, A6 = 9.94477E−06,



A8 = −3.69570E−06, A10 = 2.88772E−07, A12 = −9.37503E−09,



A14 = 1.08167E−10



Surface No. 3



K = 0.00000E+00, A4 = 1.33735E−04, A6 = 8.26828E−06,



A8 = −2.36263E−06, A10 = 1.72041E−07, A12 = −5.39358E−09,



A14 = 6.14991E−11



Surface No. 5



K = 0.00000E+00, A4 = −7.21745E−04, A6 = −2.78703E−06,



A8 = −1.01123E−05, A10 = 2.41573E−06, A12 = −3.18270E−07,



A14 = 1.76444E−08



Surface No. 14



K = 0.00000E+00, A4 = 3.84582E−04, A6 = −4.88167E−05,



A8 = 2.35198E−06, A10 = 4.74331E−08, A12 = −3.53285E−09,



A14 = 0.00000E+00



Surface No. 15



K = 0.00000E+00, A4 = 5.69667E−04, A6 = −3.94000E−05,



A8 = 1.79407E−06, A10 = 3.36301E−08, A12 = −2.29056E−09,



A14 = 0.00000E+00

















TABLE II-3





(Various data)







Zooming ratio 5.02077













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.2071
10.2045
21.1228



F-number
2.90782
5.02380
6.11771



View angle
46.1595
20.5403
10.1174



Image height
3.8000
3.8000
3.8000



Overall length
33.0753
29.8672
37.3253



of lens system



BF
0.42136
0.37974
0.40715



d4
14.3760
4.3000
0.2000



d13
1.7728
9.7004
21.4167



d15
3.8761
2.8581
2.6724











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−11.10099


2
5
9.35617


3
14
19.50093









NUMERICAL EXAMPLE II-2
The zoom lens system of Numerical Example II-2 corresponds to Embodiment II-2 shown in FIG. 76. Table II-4 shows the surface data of the zoom lens system of Numerical Example II-2. Table II-5 shows the aspherical data. Table II-6 shows various data.







TABLE II-4







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1
91.71600
1.06000
1.85976
40.6



 2*
5.02500
1.73200



 3*
8.10500
1.98000
1.99537
20.7



 4
15.41300
Variable



 5
4.67900
1.55000
1.80434
40.8



 6
20.06000
0.15000



 7
17.38100
1.05000
1.72916
54.7



 8
−7.78900
0.01000
1.56732
42.8



 9
−7.78900
0.40000
1.76182
26.6



10
5.54400
0.58300



11*
9.60700
1.03000
1.69680
55.5



12*
24.77100
0.40000



13 (Diaphragm)
∞
Variable



14*
143.86300
1.40700
1.68863
52.8



15*
−14.99700
Variable



16
∞
0.28000
1.51680
64.2



17
∞
0.50000



18
∞
0.50000
1.51680
64.2



19
∞
(BF)



Image surface
∞

















TABLE II-5





(Aspherical data)

















Surface No. 2



K = −1.72393E+00, A4 = 8.21522E−04, A6 = 2.55266E−05,



A8 = −3.88679E−06, A10 = 2.77924E−07, A12 = −9.47533E−09,



A14 = 1.16437E−10



Surface No. 3



K = 0.00000E+00, A4 = −2.24219E−04, A6 = 2.10672E−05,



A8 = −2.55993E−06, A10 = 1.68943E−07, A12 = −5.44312E−09,



A14 = 6.31627E−11



Surface No. 11



K = 0.00000E+00, A4 = −1.79281E−03, A6 = −2.82240E−04,



A8 = 1.33862E−05, A10 = 7.24137E−06, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 12



K = 0.00000E+00, A4 = 8.20695E−04, A6 = −3.73734E−05,



A8 = −4.11489E−07, A10 = 1.63224E−05, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 14



K = 0.00000E+00, A4 = −1.43793E−03, A6 = 6.22989E−05,



A8 = −3.57284E−06, A10 = 4.27742E−08, A12 = 1.29183E−09,



A14 = 0.00000E+00



Surface No. 15



K = 0.00000E+00, A4 = −1.03151E−03, A6 = −6.84282E−06,



A8 = 2.21877E−06, A10 = −1.02480E−07, A12 = 1.11563E−09,



A14 = 0.00000E+00

















TABLE II-6





(Various data)







Zooming ratio 4.78728













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.5625
10.3339
21.8419



F-number
2.91681
4.41216
6.27025



View angle
43.7744
20.6796
9.7181



Image height
3.8000
3.8000
3.8000



Overall length
32.9851
26.5722
37.4677



of lens system



BF
0.42089
0.40791
0.39091



d4
13.9363
2.2741
0.2000



d13
2.4243
4.3279
21.6993



d15
3.5716
6.9303
2.5455











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−11.49994


2
5
9.44980


3
14
19.79358









NUMERICAL EXAMPLE II-3
The zoom lens system of Numerical Example II-3 corresponds to Embodiment II-3 shown in FIG. 79. Table II-7 shows the surface data of the zoom lens system of Numerical Example II-3. Table II-8 shows the aspherical data. Table II-9 shows various data.







TABLE II-7







(Surface data)











Surface number
r
d
nd
vd





Object surface
∞





 1*
140.23000
1.06000
1.89816
34.5


 2*
5.45300
1.73200


 3*
9.42700
1.98000
2.13854
17.8


 4
17.36000
Variable


 5*
4.99100
1.55000
1.80434
40.8


 6
117.92500
0.15000


 7
12.94200
1.05000
1.72916
54.7


 8
−13.72800
0.01000
1.56732
42.8


 9
−13.72800
0.40000
1.76182
26.6


10
3.74800
0.58300


11
20.43300
1.03000
1.69680
55.5


12
−21.48900
0.40000


13 (Diaphragm)
∞
Variable


14*
−116.08400
1.40700
1.68863
52.8


15*
−12.26900
Variable


16
∞
0.28000
1.51680
64.2


17
∞
0.50000


18
∞
0.50000
1.51680
64.2


19
∞
(BF)


Image surface
∞
















TABLE II-8





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = −5.16032E−06, A6 = 1.36006E−06,



A8 = −2.35032E−08, A10 = 9.64467E−12, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.54603E+00, A4 = 8.66310E−04, A6 = 1.05013E−05,



A8 = −3.56556E−06, A10 = 2.87567E−07, A12 = −9.59572E−09,



A14 = 1.13274E−10



Surface No. 3



K = 0.00000E+00, A4 = 5.82564E−05, A6 = 1.23467E−05,



A8 = −2.44842E−06, A10 = 1.70937E−07, A12 = −5.28376E−09,



A14 = 6.04276E−11



Surface No. 5



K = 0.00000E+00, A4 = −6.59982E−04, A6 = −1.07316E−05,



A8 = −7.67478E−06, A10 = 2.20031E−06, A12 = −3.14693E−07,



A14 = 1.71160E−08



Surface No. 14



K = 0.00000E+00, A4 = 3.98783E−04, A6 = −4.87903E−05,



A8 = 2.32347E−06, A10 = 4.49831E−08, A12 = −3.64603E−09,



A14 = 0.00000E+00



Surface No. 15



K = 0.00000E+00, A4 = 6.66651E−04, A6 = −6.35825E−05,



A8 = 3.80613E−06, A10 = −2.17291E−08, A12 = −2.43698E−09,



A14 = 0.00000E+00

















TABLE II-9





(Various data)







Zooming ratio 4.75067













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.5762
10.2956
21.7403



F-number
2.90973
4.76492
6.12812



View angle
43.6578
20.3579
9.8270



Image height
3.8000
3.8000
3.8000



Overall length
32.9778
29.9914
37.7234



of lens system



BF
0.40883
0.36012
0.36629



d4
13.7226
4.3000
0.2000



d13
2.4223
9.4455
21.9297



d15
3.7921
3.2538
2.5954











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−11.37494


2
5
9.50394


3
14
19.81261









NUMERICAL EXAMPLE II-4
The zoom lens system of Numerical Example II-4 corresponds to Embodiment II-4 shown in FIG. 82. Table II-10 shows the surface data of the zoom lens system of Numerical Example II-4. Table II-11 shows the aspherical data. Table II-12 shows various data.







TABLE II-10







(Surface data)











Surface number
r
d
nd
vd





Object surface
∞





 1*
277.61100
1.06000
1.80470
41.0


 2*
5.18600
1.73200


 3*
9.15000
1.98000
1.99537
20.7


 4
17.36000
Variable


 5*
5.00400
1.55000
1.80434
40.8


 6
117.92500
0.15000


 7
12.83700
1.05000
1.72916
54.7


 8
−16.64100
0.01000
1.56732
42.8


 9
−16.64100
0.40000
1.76182
26.6


10
3.74800
0.58300


11
19.27500
1.03000
1.69680
55.5


12
−23.38700
0.40000


13 (Diaphragm)
∞
Variable


14*
−116.08400
1.40700
1.68863
52.8


15*
−12.26800
Variable


16
∞
0.28000
1.51680
64.2


17
∞
0.50000


18
∞
0.50000
1.51680
64.2


19
∞
(BF)


Image surface
∞
















TABLE II-11





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = −5.16032E−06, A6 = 1.36006E−06,



A8 = −2.35032E−08, A10 = 9.64467E−12, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.36045E+00, A4 = 9.62829E−04, A6 = 9.75296E−06,



A8 = −3.60697E−06, A10 = 2.88964E−07, A12 = −9.50399E−09,



A14 = 1.08374E−10



Surface No. 3



K = 0.00000E+00, A4 = 1.46718E−04, A6 = 9.99932E−06,



A8 = −2.39751E−06, A10 = 1.71641E−07, A12 = −5.32077E−09,



A14 = 5.98708E−11



Surface No. 5



K = 0.00000E+00, A4 = −6.52447E−04, A6 = −7.02093E−06,



A8 = −1.00791E−05, A10 = 2.75597E−06, A12 = −3.51282E−07,



A14 = 1.65967E−08



Surface No. 14



K = 0.00000E+00, A4 = 3.98783E−04, A6 = −4.87903E−05,



A8 = 2.32347E−06, A10 = 4.49831E−08, A12 = −3.64603E−09,



A14 = 0.00000E+00



Surface No. 15



K = 0.00000E+00, A4 = 6.34167E−04, A6 = −6.11751E−05,



A8 = 3.80911E−06, A10 = −3.34184E−08, A12 = −2.00676E−09,



A14 = 0.00000E+00

















TABLE II-12





(Various data)







Zooming ratio 4.74438













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.5794
10.3078
21.7266



F-number
2.91050
4.77133
6.13310



View angle
43.5230
20.3763
9.8525



Image height
3.8000
3.8000
3.8000



Overall length
32.9845
30.0066
37.7343



of lens system



BF
0.41553
0.37528
0.37716



d4
13.7226
4.3000
0.2000



d13
2.4384
9.4758
21.9238



d15
3.7760
3.2235
2.6013











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−11.37119


2
5
9.50694


3
14
19.81081









NUMERICAL EXAMPLE II-5
The zoom lens system of Numerical Example II-5 corresponds to Embodiment II-5 shown in FIG. 85. Table II-13 shows the surface data of the zoom lens system of Numerical Example II-5. Table II-14 shows the aspherical data. Table II-15 shows various data.







TABLE II-13







(Surface data)











Surface number
r
d
nd
vd





Object surface
∞





 1*
277.61100
1.06000
1.80470
41.0


 2*
5.18600
1.73200


 3*
9.15400
1.98000
1.99537
20.7


 4
17.36000
Variable


 5*
5.09400
1.55000
1.87290
40.8


 6
117.92500
0.15000


 7
16.28000
1.05000
1.72916
54.7


 8
−13.60500
0.01000
1.56732
42.8


 9
−13.60500
0.40000
1.76182
26.6


10
3.74800
0.58300


11
28.27400
1.03000
1.69680
55.5


12
−16.70500
0.40000


13 (Diaphragm)
∞
Variable


14*
−116.08400
1.40700
1.68863
52.8


15*
−12.24500
Variable


16
∞
0.28000
1.51680
64.2


17
∞
0.50000


18
∞
0.50000
1.51680
64.2


19
∞
(BF)


Image surface
∞
















TABLE II-14





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = −5.16032E−06, A6 = 1.36006E−06,



A8 = −2.35032E−08, A10 = 9.64467E−12,



A12 = 0.00000E+00, A14 = 0.00000E+00



Surface No. 2



K = −1.21146E+00, A4 = 9.42719E−04, A6 = 8.22480E−06,



A8 = −3.73153E−06, A10 = 2.89294E−07,



A12 = −9.56885E−09, A14 = 1.15064E−10



Surface No. 3



K = 0.00000E+00, A4 = 1.96871E−04, A6 = 9.09412E−06,



A8 = −2.42115E−06, A10 = 1.68578E−07,



A12 = −5.27161E−09, A14 = 6.24497E−11



Surface No. 5



K = 0.00000E+00, A4 = −5.89690E−04, A6 = −2.66456E−05,



A8 = −4.67652E−06, A10 = 2.49299E−06,



A12 = −4.37504E−07, A14 = 2.60253E−08



Surface No. 14



K = 0.00000E+00, A4 = 3.98783E−04, A6 = −4.87903E−05,



A8 = 2.32347E−06, A10 = 4.49831E−08,



A12 = −3.64603E−09, A14 = 0.00000E+00



Surface No. 15



K = 0.00000E+00, A4 = 4.95733E−04, A6 = −5.52926E−05,



A8 = 4.07254E−06, A10 = −8.39574E−08,



A12 = −3.60474E−10, A14 = 0.00000E+00

















TABLE II-15





(Various data)







Zooming ratio 4.73379













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.5814
10.3126
21.6875



F-number
2.90996
4.76998
6.12631



View angle
43.6298
20.5699
9.9939



Image height
3.8000
3.8000
3.8000



Overall length
32.9849
30.0104
37.7589



of lens system



BF
0.41591
0.37912
0.40176



d4
13.7226
4.3000
0.2000



d13
2.4562
9.4832
21.8879



d15
3.7582
3.2161
2.6372











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−11.36300


2
5
9.50654


3
14
19.76931









NUMERICAL EXAMPLE II-6
The zoom lens system of Numerical Example II-6 corresponds to Embodiment II-6 shown in FIG. 88. Table II-16 shows the surface data of the zoom lens system of Numerical Example II-6. Table II-17 shows the aspherical data. Table II-18 shows various data.







TABLE II-16







(Surface data)











Surface number
r
d
nd
vd





Object surface
∞





 1*
177.47800
1.03900
1.85976
40.6


 2*
6.63600
2.05700


 3*
11.13100
2.32400
1.99537
20.7


 4
21.12900
Variable


 5*
6.03400
1.85100
1.80434
40.8


 6
143.52700
0.20100


 7
15.89500
1.28000
1.72916
54.7


 8
−20.09100
0.01200
1.56732
42.8


 9
−20.09100
0.47900
1.76182
26.6


10
4.56200
0.74600


11
24.99300
1.11300
1.69680
55.5


12
−26.97000
0.48700


13 (Diaphragm)
∞
Variable


14*
−141.28500
1.53800
1.68863
52.8


15*
−14.74800
Variable


16
∞
0.34100
1.51680
64.2


17
∞
0.60900


18
∞
0.60900
1.51680
64.2


19
∞
(BF)


Image surface
∞
















TABLE II-17





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = −2.86219E−06, A6 = 5.09247E−07,



A8 = −5.94077E−09, A10 = 1.64570E−12, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.53666E+00, A4 = 5.02282E−04, A6 = 4.46163E−06,



A8 = −9.10715E−07, A10 = 4.91821E−08, A12 = −1.09034E−09,



A14 = 8.46522E−12



Surface No. 3



K = 0.00000E+00, A4 = 5.74073E−05, A6 = 3.98544E−06,



A8 = −6.02600E−07, A10 = 2.93515E−08, A12 = −6.16876E−10,



A14 = 4.72214E−12



Surface No. 5



K = 0.00000E+00, A4 = −3.87012E−04, A6 = 1.94856E−06,



A8 = −3.17953E−06, A10 = 4.47726E−07, A12 = −3.24123E−08,



A14 = 9.30481E−10



Surface No. 14



K = 0.00000E+00, A4 = 2.21186E−04, A6 = −1.82685E−05,



A8 = 5.87291E−07, A10 = 7.67561E−09, A12 = −4.19983E−10,



A14 = 0.00000E+00



Surface No. 15



K = 0.00000E+00, A4 = 3.95412E−04, A6 = −2.36935E−05,



A8 = 8.28888E−07, A10 = 3.84189E−09, A12 = −4.16995E−10,



A14 = 0.00000E+00

















TABLE II-18





(Various data)







Zooming ratio 4.78219













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
5.5419
12.5134
26.5024



F-number
2.88513
4.73316
6.09875



View angle
43.7864
20.3478
9.7989



Image height
4.6250
4.6250
4.6250



Overall length
39.4596
35.8400
45.2842



of lens system



BF
0.50832
0.46420
0.50531



d4
16.7018
5.2335
0.2434



d13
2.9482
11.5357
26.7513



d15
4.6153
3.9206
3.0982











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−13.88579


2
5
11.53034


3
14
23.79460









NUMERICAL EXAMPLE II-7
The zoom lens system of Numerical Example II-7 corresponds to Embodiment II-7 shown in FIG. 91. Table II-19 shows the surface data of the zoom lens system of Numerical Example II-7. Table II-20 shows the aspherical data. Table II-21 shows various data.







TABLE II-19







(Surface data)











Surface number
r
d
nd
vd





Object surface
∞





 1
126.42600
1.06000
1.86000
40.6


 2*
5.72700
1.53700


 3*
8.95800
1.77600
1.99537
20.7


 4
17.36000
Variable


 5*
5.19400
1.56100
1.80434
40.8


 6
377.10900
0.30000


 7
17.42100
1.06600
1.72916
54.7


 8
−13.83000
0.01000
1.56732
42.8


 9
−13.83000
0.40000
1.76182
26.6


10
4.00000
0.58300


11
19.73300
1.07700
1.69680
55.5


12
−23.72700
0.40000


13 (Diaphragm)
∞
Variable


14*
−1047.51300
1.40700
1.74993
45.4


15*
−14.88700
Variable


16
∞
0.28000
1.51680
64.2


17
∞
0.50000


18
∞
0.50000
1.51680
64.2


19
∞
(BF)


Image surface
∞
















TABLE II-20





(Aspherical data)

















Surface No. 2



K = −1.57344E+00, A4 = 7.46340E−04, A6 = 1.88232E−06,



A8 = −3.37126E−06, A10 = 2.89498E−07, A12 = −9.69126E−09,



A14 = 1.14218E−10



Surface No. 3



K = 0.00000E+00, A4 = 6.08925E−05, A6 = 2.83846E−06,



A8 = −2.14698E−06, A10 = 1.72132E−07, A12 = −5.49899E−09,



A14 = 6.19799E−11



Surface No. 5



K = 0.00000E+00, A4 = −5.98636E−04, A6 = −2.84764E−06,



A8 = −8.39427E−06, A10 = 2.21918E−06, A12 = −2.87429E−07,



A14 = 1.45836E−08



Surface No. 14



K = 0.00000E+00, A4 = −1.30794E−04, A6 = −9.53762E−06,



A8 = −1.31083E−06, A10 = 1.80961E−07, A12 = −4.51916E−09,



A14 = 0.00000E+00



Surface No. 15



K = 0.00000E+00, A4 = 1.09118E−04, A6 = −3.68938E−05,



A8 = 2.09767E−06, A10 = −3.35203E−08, A12 = 5.68690E−10,



A14 = 0.00000E+00

















TABLE II-21





(Various data)







Zooming ratio 4.61126













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
5.1178
11.0963
23.5995



F-number
2.90501
4.68134
6.13237



View angle
39.2002
18.9429
9.0829



Image height
3.8000
3.8000
3.8000



Overall length
33.5786
30.7415
38.3943



of lens system



BF
0.41039
0.37079
0.37158



d4
14.1000
4.7084
0.2000



d13
2.4138
9.8111
22.8264



d15
4.1974
3.3942
2.5393











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−12.85293


2
5
10.12689


3
14
20.12562









NUMERICAL EXAMPLE II-8
The zoom lens system of Numerical Example II-8 corresponds to Embodiment II-8 shown in FIG. 94. Table II-22 shows the surface data of the zoom lens system of Numerical Example II-8. Table II-23 shows the aspherical data. Table II-24 shows various data.







TABLE II-22







(Surface data)











Surface number
r
d
nd
vd





Object surface
∞





 2*
5.42900
1.73200


 3*
9.15600
1.98000
1.99537
20.7


 4
17.36000
Variable


 5*
4.97400
1.55000
1.80434
40.8


 6
117.92500
0.15000


 7
13.33900
1.05000
1.72916
54.7


 8
−20.65000
0.01000
1.56732
42.8


 9
−20.65000
0.40000
1.76182
26.6


10
3.74800
0.58300


11
17.95000
1.03000
1.69680
55.5


12
−25.80200
0.40000


13 (Diaphragm)
∞
Variable


14*
−116.08400
1.40700
1.68863
52.8


15*
−12.28300
Variable


16
∞
0.28000
1.51680
64.2


17
∞
0.50000


18
∞
0.50000
1.51680
64.2


19
∞
(BF)


Image surface
∞
















TABLE II-23





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = −5.52740E−06, A6 = 1.34755E−06,



A8 = −2.37945E−08, A10 = 6.53313E−12, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.51232E+00, A4 = 9.13792E−04, A6 = 1.00193E−05,



A8 = −3.69775E−06, A10 = 2.88686E−07, A12 = −9.37576E−09,



A14 = 1.08259E−10



Surface No. 3



K = 0.00000E+00, A4 = 1.27176E−04, A6 = 7.89593E−06,



A8 = −2.36128E−06, A10 = 1.72237E−07, A12 = −5.38467E−09,



A14 = 6.18081E−11



Surface No. 5



K = 0.00000E+00, A4 = −7.06960E−04, A6 = −3.25988E−07,



A8 = −9.87767E−06, A10 = 2.42687E−06, A12 = −3.19796E−07,



A14 = 1.70210E−08



Surface No. 14



K = 0.00000E+00, A4 = 3.70421E−04, A6 = −5.43849E−05,



A8 = 1.64888E−06, A10 = 1.80901E−09, A12 = −5.31193E−09,



A14 = 0.00000E+00



Surface No. 15



K = 0.00000E+00, A4 = 5.24695E−04, A6 = −4.63237E−05,



A8 = 1.20665E−06, A10 = 4.10694E−09, A12 = −4.23522E−09,



A14 = 0.00000E+00

















TABLE II-24





(Various data)







Zooming ratio 5.35662













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.5928
10.2950
24.6021



F-number
2.90896
4.74737
6.91879



View angle
43.5348
20.5052
8.8865



Image height
3.8000
3.8000
3.8000



Overall length
32.9479
30.0189
38.9815



of lens system



BF
0.40477
0.36130
0.37320



d4
13.7226
4.3000
0.2000



d13
2.2520
9.2104
24.8417



d15
3.9365
3.5152
0.9346











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−11.42384


2
5
9.55095


3
14
19.83788









NUMERICAL EXAMPLE II-9
The zoom lens system of Numerical Example II-9 corresponds to Embodiment II-9 shown in FIG. 97. Table II-25 shows the surface data of the zoom lens system of Numerical Example II-9. Table II-26 shows the aspherical data. Table II-27 shows various data.







TABLE II-25







(Surface data)











Surface number
r
d
nd
vd














Object surface
∞





 1*
102.49100
1.06000
1.85976
40.6


 2*
5.38400
1.73200


 3*
9.16300
1.98000
1.99537
20.7


 4
17.36000
Variable


 5*
4.98100
1.55000
1.80434
40.8


 6
117.92500
0.15000


 7
13.41700
1.05000
1.72916
54.7


 8
−22.36400
0.01000
1.56732
42.8


 9
−22.36400
0.40000
1.76182
26.6


10
3.74800
0.58300


11
17.49900
1.03000
1.69680
55.5


12
−27.91500
0.40000


13 (Diaphragm)
∞
Variable


14*
−116.08400
1.40700
1.68863
52.8


15*
−12.30700
Variable


16
∞
0.28000
1.51680
64.2


17
∞
0.50000


18
∞
0.50000
1.51680
64.2


19
∞
(BF)


Image surface
∞
















TABLE II-26





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = −9.58085E−06, A6 = 1.28804E−06,



A8 = −2.45481E−08, A10 = −7.28916E−12, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.52889E+00, A4 = 9.08403E−04, A6 = 1.00563E−05,



A8 = −3.70044E−06, A10 = 2.88590E−07, A12 = −9.37676E−09,



A14 = 1.08272E−10



Surface No. 3



K = 0.00000E+00, A4 = 1.17643E−04, A6 = 7.85565E−06,



A8 = −2.35722E−06, A10 = 1.72387E−07, A12 = −5.38158E−09,



A14 = 6.18075E−11



Surface No. 5



K = 0.00000E+00, A4 = −6.97064E−04, A6 = 1.09037E−06,



A8 = −9.75291E−06, A10 = 2.43347E−06, A12 = −3.20810E−07,



A14 = 1.65049E−08



Surface No. 14



K = 0.00000E+00, A4 = 3.07888E−04, A6 = −5.28977E−05,



A8 = 1.68576E−06, A10 = 1.34836E−09, A12 = 1.29575E−10,



A14 = 0.00000E+00



Surface No. 15



K = 0.00000E+00, A4 = 5.47465E−04, A6 = −5.13331E−05,



A8 = 1.07290E−06, A10 = 4.69963E−08, A12 = −1.02369E−09,



A14 = 0.00000E+00

















TABLE II-27





(Various data)







Zooming ratio 5.52871













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.6725
10.3808
25.8329



F-number
2.94730
4.77127
7.24009



View angle
42.6119
20.1748
8.3929



Image height
3.8000
3.8000
3.8000



Overall length
33.0804
30.2033
40.0342



of lens system



BF
0.40551
0.36552
0.38499



d4
13.7226
4.3000
0.2000



d13
2.3123
9.1093
26.0977



d15
4.0080
3.7965
0.7195











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−11.50512


2
5
9.64428


3
14
19.88122









NUMERICAL EXAMPLE II-10
The zoom lens system of Numerical Example II-10 corresponds to Embodiment II-10 shown in FIG. 100. Table II-28 shows the surface data of the zoom lens system of Numerical Example II-10. Table II-29 shows the aspherical data. Table II-30 shows various data.







TABLE II-28







(Surface data)











Surface number
r
d
nd
vd














Object surface
∞





 1*
76.42751
1.00000
1.80470
41.0


 2*
6.64817
1.48000


 3
7.75447
1.60000
1.92286
20.9


 4
10.50123
Variable


 5*
5.53570
1.50000
1.80434
40.8


 6
−674.52140
0.30000


 7
10.79499
1.10000
1.72916
54.7


 8
−15.59648
0.01000
1.56732
42.8


 9
−15.59648
0.40000
1.76182
26.6


10
4.00000
0.64000


11
40.99489
1.10000
1.80146
40.2


12
−40.99489
0.30000


13 (Diaphragm)
∞
Variable


14
−53.29376
1.33000
1.68863
52.8


15*
−12.58029
Variable


16
∞
0.28000
1.51680
64.2


17
∞
0.50000


18
∞
0.50000
1.51680
64.2


19
∞
(BF)


Image surface
∞
















TABLE II-29





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = 5.76012E−05, A6 = 8.73773E−07,



A8 = 0.00000E+00, A10 = 0.00000E+00, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.43352E+00, A4 = 6.73429E−04, A6 = −1.70436E−07,



A8 = 1.25757E−07, A10 = 3.13106E−08, A12 = −1.68591E−09,



A14 = 3.01568E−11



Surface No. 5



K = 0.00000E+00, A4 = −4.98245E−04, A6 = 4.02131E−06,



A8 = −1.18557E−05, A10 = 2.68271E−06, A12 = −2.79815E−07,



A14 = 1.08519E−08



Surface No. 15



K = 0.00000E+00, A4 = −3.33092E−05, A6 = 2.24255E−05,



A8 = −2.42474E−06, A10 = 1.37066E−07, A12 = −2.99454E−09,



A14 = 0.00000E+00

















TABLE II-30





(Various data)







Zooming ratio 4.72712













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
6.0022
13.0594
28.3731



F-number
3.44370
5.55842
6.33102



View angle
34.9812
16.3974
7.6997



Image height
3.8000
3.8000
3.8000



Overall length
33.8543
31.0006
39.9649



of lens system



BF
0.46119
0.40554
0.37123



d4
14.2069
4.6883
0.2000



d13
2.9360
10.1917
24.3632



d15
4.2102
3.6751
2.9905











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−13.93476


2
5
10.14370


3
14
23.59911









NUMERICAL EXAMPLE II-11
The zoom lens system of Numerical Example II-11 corresponds to Embodiment II-11 shown in FIG. 103. Table II-31 shows the surface data of the zoom lens system of Numerical Example II-11. Table II-32 shows the aspherical data. Table II-33 shows various data.







TABLE II-31







(Surface data)











Surface number
r
d
nd
vd














Object surface
∞





 1*
59.05000
1.06000
1.85280
39.0


 2*
5.46200
1.50400


 3*
8.60600
1.75000
1.99537
20.7


 4
14.38100
Variable


 5*
4.36700
2.50000
1.80359
40.8


 6
−67.53500
0.00000


 7
−67.53500
0.40000
1.80518
25.5


 8
3.80100
0.47700


 9
12.23200
1.14400
1.77250
49.6


10
−16.77300
0.30000


11 (Diaphragm)
∞
Variable


12*
145.66100
1.33400
1.60602
57.4


13*
−11.92000
Variable


14
∞
0.78000
1.51680
64.2


15
∞
(BF)


Image surface
∞
















TABLE II-32





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = 3.04043E−06, A6 = 8.38044E−08,



A8 = 3.68394E−10, A10 = 1.11988E−11, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.14246E+00, A4 = 9.52084E−04, A6 = 1.16305E−05,



A8 = −3.37781E−06, A10 = 2.84249E−07, A12 = −9.68993E−09,



A14 = 1.17859E−10



Surface No. 3



K = 0.00000E+00, A4 = 2.77587E−04, A6 = 7.49692E−06,



A8 = −2.20563E−06, A10 = 1.70898E−07, A12 = −5.50993E−09,



A14 = 6.41238E−11



Surface No. 5



K = −2.43504E−01, A4 = −3.61300E−04, A6 = 1.01452E−05,



A8 = −3.95475E−06, A10 = 2.05823E−07, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 12



K = 0.00000E+00, A4 = −3.11808E−04, A6 = 1.60552E−05,



A8 = −9.71795E−07, A10 = 2.22891E−07, A12 = −2.85194E−09,



A14 = 0.00000E+00



Surface No. 13



K = 0.00000E+00, A4 = 3.67285E−05, A6 = −1.48330E−05,



A8 = 2.12933E−06, A10 = 5.52463E−08, A12 = 2.05349E−09,



A14 = 0.00000E+00

















TABLE II-33





(Various data)







Zooming ratio 4.70964













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.2182
10.9848
19.8661



F-number
2.91810
4.94788
6.15928



View angle
45.5442
19.1934
10.7826



Image height
3.8000
3.8000
3.8000



Overall length
32.2531
29.2032
33.9277



of lens system



BF
0.89844
0.85770
0.89904



d4
14.1856
3.9014
0.2000



d11
2.1610
11.4996
19.9321



d13
3.7591
1.6955
1.6476











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−11.81909


2
5
9.29435


3
12
18.23972









NUMERICAL EXAMPLE II-12
The zoom lens system of Numerical Example II-12 corresponds to Embodiment II-12 shown in FIG. 106. Table II-34 shows the surface data of the zoom lens system of Numerical Example II-12. Table II-35 shows the aspherical data. Table II-36 shows various data.







TABLE II-34







(Surface data)











Surface number
r
d
nd
vd














Object surface
∞





 1*
48.20000
1.06000
1.85280
39.0


 2*
5.40600
1.50400


 3*
8.59700
1.75000
1.99537
20.7


 4
14.38100
Variable


 5*
4.37800
2.50000
1.80359
40.8


 6
−74.88600
0.00000


 7
−74.88600
0.40000
1.80518
25.5


 8
3.79800
0.47700


 9
12.73200
1.14400
1.77250
49.6


10
−16.77300
0.30000


11 (Diaphragm)
∞
Variable


12*
147.88000
1.33400
1.60602
57.4


13*
−13.66400
Variable


14
∞
0.78000
1.51680
64.2


15
∞
(BF)


Image surface
∞
















TABLE II-35





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = 3.27932E−07, A6 = −4.95347E−08,



A8 = 0.00000E+00, A10 = 0.00000E+00, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.15549E+00, A4 = 9.45387E−04, A6 = 1.00448E−05,



A8 = −3.40038E−06, A10 = 2.83776E−07, A12 = −9.69584E−09,



A14 = 1.17520E−10



Surface No. 3



K = 0.00000E+00, A4 = 2.60379E−04, A6 = 6.67780E−06,



A8 = −2.20806E−06, A10 = 1.70845E−07, A12 = −5.50808E−09,



A14 = 6.38203E−11



Surface No. 5



K = −2.33677E−01, A4 = −3.37270E−04, A6 = 5.87427E−06,



A8 = −3.18469E−06, A10 = 2.15900E−07, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 12



K = 0.00000E+00, A4 = −3.84815E−04, A6 = 1.89763E−05,



A8 = −9.66009E−07, A10 = 2.07197E−07, A12 = −2.90921E−09,



A14 = 0.00000E+00



Surface No. 13



K = 0.00000E+00, A4 = −8.25767E−05, A6 = −1.37702E−05,



A8 = 1.82480E−06, A10 = 5.49510E−08, A12 = 2.05096E−09,



A14 = 0.00000E+00

















TABLE II-36





(Various data)







Zooming ratio 4.66639













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.5138
11.0107
21.0630



F-number
2.92234
4.74573
6.11588



View angle
42.9660
19.1684
10.1843



Image height
3.8000
3.8000
3.8000



Overall length
32.9135
29.6175
34.9167



of lens system



BF
0.89634
0.86350
0.87175



d4
14.3758
4.2462
0.2000



d11
2.4307
11.1258
20.7413



d13
3.9617
2.1330
1.8547











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−12.09887


2
5
9.49321


3
12
20.70451









NUMERICAL EXAMPLE II-13
The zoom lens system of Numerical Example II-13 corresponds to Embodiment II-13 shown in FIG. 109. Table II-37 shows the surface data of the zoom lens system of Numerical Example II-13. Table II-38 shows the aspherical data. Table II-39 shows various data.







TABLE II-37







(Surface data)











Surface number
r
d
nd
vd














Object surface
∞





 1
43.56000
1.06000
1.85280
39.0


 2*
5.54700
1.50400


 3*
8.64600
1.75000
1.99537
20.7


 4
14.38100
Variable


 5*
4.39600
2.50000
1.80359
40.8


 6
−115.81400
0.00000


 7
−115.81400
0.40000
1.80518
25.5


 8
3.79300
0.47700


 9
14.69100
1.14400
1.77250
49.6


10
−16.77300
0.30000


11 (Diaphragm)
∞
Variable


12*
79.01900
1.33400
1.60602
57.4


13*
−14.68200
Variable


14
∞
0.78000
1.51680
64.2


15
∞
(BF)


Image surface
∞
















TABLE II-38





(Aspherical data)

















Surface No. 2



K = −1.11955E+00, A4 = 9.72575E−04, A6 = 5.28421E−06,



A8 = −3.33441E−06, A10 = 2.83170E−07, A12 = −9.76538E−09,



A14 = 1.18913E−10



Surface No. 3



K = 0.00000E+00, A4 = 2.96666E−04, A6 = 4.70617E−06,



A8 = −2.23721E−06, A10 = 1.71468E−07, A12 = −5.48027E−09,



A14 = 6.24905E−11



Surface No. 5



K = −2.21945E−01, A4 = −3.12123E−04, A6 = 4.68008E−06,



A8 = −3.33833E−06, A10 = 2.42304E−07, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 12



K = 0.00000E+00, A4 = −5.07858E−04, A6 = 1.16247E−05,



A8 = −1.11086E−06, A10 = 1.55636E−07, A12 = −9.60910E−10,



A14 = 0.00000E+00



Surface No. 13



K = 0.00000E+00, A4 = −4.92557E−04, A6 = −2.33283E−06,



A8 = 7.70699E−07, A10 = 4.54566E−08, A12 = 2.00412E−09,



A14 = 0.00000E+00

















TABLE II-39





(Various data)







Zooming ratio 4.65926













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.9826
11.0055
23.2154



F-number
2.96523
4.88875
6.11703



View angle
38.2008
18.4701
8.9029



Image height
3.6000
3.6000
3.6000



Overall length
33.4459
31.3516
38.0142



of lens system



BF
0.90869
0.86454
0.89389



d4
14.2459
5.5449
0.2000



d11
2.6393
11.7655
23.1698



d13
4.4030
1.9277
2.5015











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−12.88044


2
5
10.10697


3
12
20.54116









NUMERICAL EXAMPLE II-14
The zoom lens system of Numerical Example II-14 corresponds to Embodiment 11-14 shown in FIG. 112. Table II-40 shows the surface data of the zoom lens system of Numerical Example II-14. Table II-41 shows the aspherical data. Table II-42 shows various data.







TABLE II-40







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1*
65.26800
1.06000
1.85280
39.0



 2*
5.43100
1.50400



 3*
8.75800
1.75000
1.99537
20.7



 4
14.38100
Variable



 5*
4.34800
2.50000
1.80359
40.8



 6
154.36000
0.00000



 7
154.36000
0.40000
1.80518
25.5



 8
3.78600
0.47700



 9
12.80100
1.14400
1.77250
49.6



10
−16.77300
0.30000



11(Diaphragm)
∞
Variable



12*
−21.93400
1.33400
1.60602
57.4



13*
−8.75000
Variable



14
∞
0.78000
1.51680
64.2



15
∞
(BF)



Image surface
∞

















TABLE II-41





(Aspherical data)

















Surface No. 1



K = 0.00000E+00, A4 = 1.92866E−06, A6 = −2.59806E−07,



A8 = 0.00000E+00, A10 = 0.00000E+00, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 2



K = −1.12457E+00, A4 = 9.65240E−04, A6 = 7.72275E−06,



A8 = −3.45452E−06, A10 = 2.84301E−07, A12 = −9.70703E−09,



A14 = 1.17484E−10



Surface No. 3



K = 0.00000E+00, A4 = 2.90216E−04, A6 = 7.30560E−06,



A8 = −2.22065E−06, A10 = 1.70191E−07, A12 = −5.52242E−09,



A14 = 6.43532E−11



Surface No. 5



K = −2.32994E−01, A4 = −3.37630E−04, A6 = 2.79870E−06,



A8 = −3.71831E−06, A10 = 3.04308E−07, A12 = 0.00000E+00,



A14 = 0.00000E+00



Surface No. 12



K = 0.00000E+00, A4 = −3.98270E−04, A6 = 1.52053E−05,



A8 = −8.64592E−07, A10 = 2.48416E−07, A12 = −4.83203E−09,



A14 = 0.00000E+00



Surface No. 13



K = 0.00000E+00, A4 = 1.48124E−04, A6 = −1.28334E−05,



A8 = 2.23453E−06, A10 = 2.99201E−08, A12 = 1.47871E−09,



A14 = 0.00000E+00

















TABLE II-42





(Various data)







Zooming ratio 5.64043













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.5204
11.0121
25.4968



F-number
2.92132
5.03801
7.49395



View angle
41.3621
18.1278
7.9812



Image height
3.6000
3.6000
3.6000



Overall length
33.3391
30.6877
39.6399



of lens system



BF
0.90466
0.88115
0.85890



d4
14.3758
4.8086
0.2000



d11
2.2899
11.5361
25.6839



d13
4.5197
2.2129
1.6481











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−11.17647


2
5
9.42887


3
12
23.13762









NUMERICAL EXAMPLE II-15
The zoom lens system of Numerical Example II-15 corresponds to Embodiment 11-15 shown in FIG. 115. Table II-43 shows the surface data of the zoom lens system of Numerical Example II-15. Table II-44 shows the aspherical data. Table II-45 shows various data.







TABLE II-43







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1
63.47399
1.06000
1.85280
39.0



 2*
6.01722
1.50400



 3*
8.59181
1.75000
1.99537
20.7



 4
14.38100
Variable



 5*
6.08005
1.56770
1.68863
52.8



 6
−35.80408
0.10000



 7
7.98466
1.48630
1.83481
42.7



 8
−7.57710
0.01000
1.56732
42.8



 9
−7.57710
0.40000
1.71736
29.5



10
3.50287
0.98500



11(Diaphragm)
∞
Variable



12*
−122.39270
1.33400
1.68863
52.8



13*
−12.51244
Variable



14
∞
0.28000
1.51680
64.2



15
∞
0.50000



16
∞
0.50000
1.51680
64.2



17
∞
(BF)



Image surface
∞

















TABLE II-44





(Aspherical data)

















Surface No. 2



K = −1.40153E+00, A4 = 8.22636E−04, A6 = 7.20741E−06,



A8 = −3.32095E−06, A10 = 2.82431E−07, A12 = −9.82219E−09,



A14 = 1.18759E−10



Surface No. 3



K = 0.00000E+00, A4 = 1.68228E−04, A6 = 3.35892E−06,



A8 = −2.18948E−06, A10 = 1.71047E−07, A12 = −5.51145E−09,



A14 = 6.18100E−11



Surface No. 5



K = 0.00000E+00, A4 = −8.68691E−04, A6 = −1.04599E−05,



A8 = −4.13399E−07, A10 = −1.71635E−07, A12 = 3.28061E−08,



A14 = −1.59341E−09



Surface No. 12



K = 0.00000E+00, A4 = 7.33143E−05, A6 = 8.19768E−07,



A8 = −1.14709E−06, A10 = 1.69694E−07, A12 = −4.34250E−09,



A14 = 0.00000E+00



Surface No. 13



K = 0.00000E+00, A4 = 3.98865E−04, A6 = −2.32267E−05,



A8 = 1.39281E−06, A10 = 2.04809E−08, A12 = −9.18152E−10,



A14 = 0.00000E+00

















TABLE II-45





(Various data)







Zooming ratio 4.69249













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
5.3887
11.4765
25.2865



F-number
2.90678
4.47443
6.16111



View angle
37.6440
18.1179
8.4394



Image height
3.8000
3.8000
3.8000



Overall length
33.2324
28.8126
36.4906



of lens system



BF
0.41957
0.34467
0.39309



d4
14.8608
4.6809
0.2000



d11
2.6360
8.2604
21.7344



d13
3.8390
4.0496
2.6861











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−14.00580


2
5
9.86327


3
12
20.13942









NUMERICAL EXAMPLE II-16
The zoom lens system of Numerical Example II-16 corresponds to Embodiment 11-16 shown in FIG. 118. Table II-46 shows the surface data of the zoom lens system of Numerical Example II-16. Table II-47 shows the aspherical data. Table II-48 shows various data.







TABLE II-46







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1
105.88040
1.06000
1.85280
39.0



 2*
6.23376
1.50400



 3*
8.46665
1.75000
1.99537
20.7



 4
14.38100
Variable



 5*
6.15230
1.88160
1.68863
52.8



 6
−32.24219
0.10000



 7
8.16407
1.41330
1.83481
42.7



 8
−7.68828
0.01000
1.56732
42.8



 9
−7.68828
0.40000
1.71736
29.5



10
3.50287
0.98500



11(Diaphragm)
∞
Variable



12*
−35.85802
1.33400
1.68863
52.8



13*
−10.16980
Variable



14
∞
0.28000
1.51680
64.2



15
∞
0.50000



16
∞
0.50000
1.51680
64.2



17
∞
(BF)



Image surface
∞

















TABLE II-47





(Aspherical data)

















Surface No. 2



K = −1.45141E+00, A4 = 7.96134E−04, A6 = 4.37615E−06,



A8 = −3.49951E−06, A10 = 2.82588E−07, A12 = −9.66903E−09,



A14 = 1.19040E−10



Surface No. 3



K = 0.00000E+00, A4 = 1.49295E−04, A6 = 1.49208E−06,



A8 = −2.19105E−06, A10 = 1.69875E−07, A12 = −5.56163E−09,



A14 = 6.49477E−11



Surface No. 5



K = 0.00000E+00, A4 = −8.65393E−04, A6 = −1.02618E−05,



A8 = −2.85667E−07, A10 = −1.61372E−07, A12 = 3.29730E−08,



A14 = −1.69534E−09



Surface No. 12



K = 0.00000E+00, A4 = 6.56179E−04, A6 = −9.84731E−08,



A8 = −1.07336E−06, A10 = 1.54031E−07, A12 = −4.49727E−09,



A14 = 0.00000E+00



Surface No. 13



K = 0.00000E+00, A4 = 8.30977E−04, A6 = −9.79112E−06,



A8 = 1.21591E−06, A10 = 1.19379E−08, A12 = −1.54444E−09,



A14 = 0.00000E+00

















TABLE II-48





(Various data)







Zooming ratio 4.63150













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
5.7864
11.4767
26.7998



F-number
3.02921
4.55167
6.53395



View angle
35.3303
18.1967
8.0769



Image height
3.8000
3.8000
3.8000



Overall length
33.1983
29.8606
38.1607



of lens system



BF
0.40164
0.34662
0.39982



d4
14.1463
5.2646
0.2000



d11
2.6360
8.5161
23.1569



d13
4.2965
4.0154
2.6861











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−14.29099


2
5
10.14036


3
12
20.18727









NUMERICAL EXAMPLE II-17
The zoom lens system of Numerical Example II-17 corresponds to Embodiment II-17 shown in FIG. 121. Table II-49 shows the surface data of the zoom lens system of Numerical Example II-17. Table II-50 shows the aspherical data. Table II-51 shows various data.







TABLE II-49







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1
67.11508
1.06000
1.85280
39.0



 2*
5.93643
1.50400



 3*
8.67244
1.75000
1.99537
20.7



 4
14.38100
Variable



 5*
6.04644
1.50070
1.68863
52.8



 6
−31.45638
0.10000



 7
8.02778
1.52600
1.83481
42.7



 8
−7.47219
0.01000
1.56732
42.8



 9
−7.47219
0.40000
1.71736
29.5



10
3.50287
0.98500



11(Diaphragm)
∞
Variable



12*
−107.31420
1.33400
1.68863
52.8



13*
−12.02005
Variable



14
∞
0.28000
1.51680
64.2



15
∞
0.50000



16
∞
0.50000
1.51680
64.2



17
∞
(BF)



Image surface
∞

















TABLE II-50





(Aspherical data)

















Surface No. 2



K = −1.40725E+00, A4 = 8.24033E−04, A6 = 7.65767E−06,



A8 = −3.31358E−06, A10 = 2.82628E−07, A12 = −9.81656E−09,



A14 = 1.18891E−10



Surface No. 3



K = 0.00000E+00, A4 = 1.68357E−04, A6 = 3.35244E−06,



A8 = −2.18545E−06, A10 = 1.71187E−07, A12 = −5.50659E−09,



A14 = 6.20096E−11



Surface No. 5



K = 0.00000E+00, A4 = −9.09029E−04, A6 = −1.11663E−05,



A8 = −3.76602E−07, A10 = −1.69774E−07, A12 = 3.26901E−08,



A14 = −1.59319E−09



Surface No. 12



K = 0.00000E+00, A4 = 4.98372E−05, A6 = 2.36765E−05,



A8 = −1.16504E−06, A10 = 1.33583E−07, A12 = −4.07360E−09,



A14 = 0.00000E+00



Surface No. 13



K = 0.00000E+00, A4 = 5.23496E−04, A6 = −1.18940E−05,



A8 = 1.57366E−06, A10 = 3.05910E−08, A12 = −2.51680E−09,



A14 = 0.00000E+00

















TABLE II-51





(Various data)







Zooming ratio 4.97350













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.9440
10.9999
24.5887



F-number
2.86849
4.47181
6.02934



View angle
40.5984
18.7047
8.5997



Image height
3.8000
3.8000
3.8000



Overall length
33.3276
28.0492
36.0296



of lens system



BF
0.42910
0.35221
0.38698



d4
15.4234
4.4723
0.2000



d11
2.6360
7.7519
21.3068



d13
3.3894
4.0230
2.6861











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−13.26565


2
5
9.49125


3
12
19.54515









NUMERICAL EXAMPLE II-18
The zoom lens system of Numerical Example II-18 corresponds to Embodiment II-18 shown in FIG. 124. Table II-52 shows the surface data of the zoom lens system of Numerical Example II-18. Table II-53 shows the aspherical data. Table II-54 shows various data.







TABLE II-52







(Surface data)













Surface number
r
d
nd
vd







Object surface
∞






 1
66.99756
1.06000
1.85280
39.0



 2*
5.92693
1.50400



 3*
8.66891
1.75000
1.99537
20.7



 4
14.38100
Variable



 5*
6.04238
1.47300
1.68863
52.8



 6
−31.84957
0.10000



 7
7.97831
1.52260
1.83481
42.7



 8
−7.42943
0.01000
1.56732
42.8



 9
−7.42943
0.40000
1.71736
29.5



10
3.50287
0.98500



11(Diaphragm)
∞
Variable



12*
−124.53680
1.33400
1.68863
52.8



13*
−11.63546
Variable



14
∞
0.28000
1.51680
64.2



15
∞
0.50000



16
∞
0.50000
1.51680
64.2



17
∞
(BF)



Image surface
∞

















TABLE II-53





(Aspherical data)

















Surface No. 2



K = −1.40989E+00, A4 = 8.22545E−04, A6 = 7.45234E−06,



A8 = −3.31504E−06, A10 = 2.82561E−07, A12 = −9.82067E−09,



A14 = 1.18701E−10



Surface No. 3



K = 0.00000E+00, A4 = 1.68883E−04, A6 = 3.36000E−06,



A8 = −2.18923E−06, A10 = 1.71073E−07, A12 = −5.50897E−09,



A14 = 6.19721E−11



Surface No. 5



K = 0.00000E+00, A4 = −9.17209E−04, A6 = −1.14922E−05,



A8 = −3.86295E−07, A10 = −1.69119E−07, A12 = 3.29873E−08,



A14 = −1.52387E−09



Surface No. 12



K = 0.00000E+00, A4 = 3.44434E−05, A6 = 2.52919E−05,



A8 = −1.15251E−06, A10 = 1.31557E−07, A12 = −3.96388E−09,



A14 = 0.00000E+00



Surface No. 13



K = 0.00000E+00, A4 = 5.44445E−04, A6 = −1.16407E−05,



A8 = 1.60284E−06, A10 = 3.33080E−08, A12 = −2.54996E−09,



A14 = 0.00000E+00

















TABLE II-54





(Various data)







Zooming ratio 4.94889













Wide-angle
Middle
Telephoto




limit
position
limit







Focal length
4.8230
9.8989
23.8686



F-number
2.92673
4.29935
6.02423



View angle
41.2896
20.6747
8.8279



Image height
3.8000
3.8000
3.8000



Overall length
33.3145
27.6252
35.5444



of lens system



BF
0.42965
0.35867
0.38805



d4
15.5588
5.1363
0.2000



d11
2.6360
6.7258
20.8516



d13
3.2715
3.9858
2.6861











Zoom lens unit data









Lens unit
Initial surface
Focal length





1
1
−13.24063


2
5
9.45447


3
12
18.54849









The following Table II-55 shows the corresponding values to the individual conditions in the zoom lens systems of Numerical Examples. Here, in Table II-55, YW is defined as
an amount of movement in a direction perpendicular to the optical axis at the time of maximum blur compensation in the second lens unit with a focal length fW of the entire system at a wide-angle limit, and
indicates a value obtained in a state that the zoom lens system is at a wide-angle limit. That is, a corresponding value (YW/YT)/(fT/fW) at the time of Y=YW (f=fW) in the condition formula (3) was obtained.







TABLE II-55





(Values corresponding to conditions)

















Example
















Condition
II-1
II-2
II-3
II-4
II-5
II-6
II-7
II-8
II-9




















(27)
fL3/fG2
0.68
0.77
0.68
0.68
0.64
0.68
0.65
0.67
0.67


(1)
D2/(Ir × Z2)
0.19
0.21
0.21
0.21
0.22
0.21
0.23
0.18
0.18


(2)
YW
0.0397
0.0419
0.0419
0.0419
0.0419
0.0511
0.0479
0.0423
0.0430



YT
0.0820
0.0848
0.0838
0.0838
0.0838
0.1025
0.0935
0.0847
0.0860


(3)
(YW/YT)/(fW/fT)
0.096
0.103
0.105
0.105
0.106
0.104
0.111
0.093
0.090


(4)
(D2T − D2W)/(Ir × Z2)
0.21
0.22
0.23
0.23
0.23
0.23
0.25
0.21
0.20


(5)
fG1/fG2
−1.19
−1.22
−1.20
−1.20
−1.20
−1.20
−1.27
−1.20
−1.19


(6)
fG1/fG3
−0.57
−0.58
−0.57
−0.57
−0.57
−0.58
−0.64
−0.58
−0.58


(7)
fG2/fG3
0.48
0.48
0.48
0.48
0.48
0.48
0.50
0.48
0.49


(8)
fG1/fT
−0.53
−0.53
−0.52
−0.52
−0.52
−0.52
−0.54
−0.46
−0.45


(9)
fG2/fT
0.44
0.43
0.44
0.44
0.44
0.44
0.43
0.39
0.37


(10)
fG3/fT
0.92
0.91
0.91
0.91
0.91
0.90
0.85
0.81
0.77


(11)
(D1W + D2W)/(D1T + D2T)
0.75
0.75
0.73
0.73
0.73
0.73
0.72
0.64
0.61


(12)
(D2T − D2W)/fW
4.67
4.22
4.26
4.26
4.24
4.30
3.99
4.92
5.09


(13)
(D2T − D2W)/fT
0.93
0.88
0.90
0.90
0.90
0.90
0.86
0.92
0.92


(14)
D1T/Ir
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05


(15)
(fW/Ir) × (fW/fT)
0.22
0.25
0.25
0.25
0.25
0.25
0.29
0.23
0.22


(16)
tan(ωW) × Z
5.23
4.59
4.53
4.51
4.51
4.58
3.76
5.09
5.09


(17)
|fW × fG1|/Ir2
3.23
3.63
3.60
3.61
3.61
3.60
4.56
3.63
3.72


(18)
(fW · fG2)/Ir2
2.73
2.99
3.01
3.01
3.02
2.99
3.59
3.04
3.12


(19)
(DG1 + DG2 + DG3)/fT
0.52
0.50
0.50
0.50
0.50
0.48
0.46
0.45
0.42


(20)
(FW × FT)/Z
3.54
3.82
3.75
3.76
3.77
3.68
3.86
3.76
3.86


(21)
LT/(Ir × Z)
1.95
2.06
2.09
2.09
2.10
2.04
2.19
1.91
1.90


(22)
(DG2 + (DG2A))/(DG2A)
12.92
12.93
12.93
12.93
12.93
12.67
13.49
12.93
12.93


(23)
fL2/fG1
−1.59
−1.32
−1.41
−1.53
−1.53
−1.53
−1.31
−1.52
−1.51


(24)
R2F/fT
0.44
0.37
0.43
0.42
0.42
0.42
0.38
0.37
0.35


(25)
R2R/fT
0.82
0.71
0.80
0.80
0.80
0.80
0.74
0.71
0.67


(26)
fL2/fT
0.84
0.69
0.74
0.80
0.80
0.80
0.71
0.71
0.67


(29)
(1 − m2T) × m3T
2.70
2.70
2.72
2.71
2.71
2.71
2.64
3.04
3.14


(30)
m2T/m2W
4.63
4.47
4.38
4.38
4.39
4.40
4.13
4.43
4.50


(31)
(1 − m2T/m2W) × (m3T/m3W)
−3.94
−3.72
−3.67
−3.66
−3.66
−3.70
−3.49
−4.15
−4.30


(32)
(1 − m2W) × m3W
1.11
1.14
1.14
1.14
1.15
1.14
1.12
1.14
1.14



fT/fW
5.02
4.79
4.75
4.74
4.73
4.78
4.61
5.36
5.53



ωW
46.160
43.774
43.658
43.523
43.630
43.786
39.200
43.535
42.612












Example
















Condition
II-10
II-11
II-12
II-13
II-14
II-15
II-16
II-17
II-18




















(27)
fL3/fG2
0.67
0.56
0.55
0.53
0.59
0.78
0.75
0.79
0.79


(1)
D2/(Ir × Z2)
0.24
0.19
0.20
0.23
0.17
0.21
0.23
0.19
0.19


(2)
YW
0.0524
0.0413
0.0426
0.0476
0.0404
0.0501
0.0533
0.0458
0.0453



YT
0.1038
0.0829
0.0854
0.0933
0.0841
0.1016
0.1044
0.0972
0.0966


(3)
(YW/YT)/(fW/fT)
0.107
0.106
0.107
0.109
0.085
0.105
0.110
0.095
0.095


(4)
(D2T − D2W)/(Ir × Z2)
0.25
0.21
0.22
0.25
0.19
0.23
0.25
0.20
0.20


(5)
fG1/fG2
−1.37
−1.27
−1.27
−1.27
−1.19
−1.42
−1.41
−1.40
−1.40


(6)
fG1/fG3
−0.59
−0.65
−0.58
−0.63
−0.48
−0.70
−0.71
−0.68
−0.71


(7)
fG2/fG3
0.43
0.51
0.46
0.49
0.41
0.49
0.50
0.49
0.51


(8)
fG1/fT
−0.49
−0.59
−0.57
−0.55
−0.44
−0.55
−0.53
−0.54
−0.55


(9)
fG2/fT
0.36
0.47
0.45
0.44
0.37
0.39
0.38
0.39
0.40


(10)
fG3/fT
0.83
0.92
0.98
0.88
0.91
0.80
0.75
0.79
0.78


(11)
(D1W + D2W)/(D1T + D2T)
0.70
0.81
0.80
0.72
0.64
0.80
0.72
0.84
0.86


(12)
(D2T − D2W)/fW
3.57
4.21
4.06
4.12
5.18
3.54
3.55
3.78
3.78


(13)
(D2T − D2W)/fT
0.76
0.89
0.87
0.88
0.92
0.76
0.77
0.76
0.76


(14)
D1T/Ir
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05
0.05


(15)
(fW/Ir) × (fW/fT)
0.33
0.24
0.25
0.28
0.21
0.30
0.33
0.26
0.26


(16)
tan(ωW) × Z
3.36
4.54
4.10
3.67
4.97
3.64
3.29
4.29
4.38


(17)
|fW × fG1|/Ir2
5.79
3.45
3.78
4.44
3.50
5.23
5.73
4.54
4.42


(18)
(fW · fG2)/Ir2
4.22
2.72
2.97
3.49
2.95
3.68
4.06
3.25
3.16


(19)
(DG1 + DG2 + DG3)/fT
0.37
0.51
0.48
0.44
0.40
0.36
0.35
0.37
0.38


(20)
(FW × FT)/Z
4.61
3.82
3.83
3.89
3.88
3.82
4.27
3.48
3.56


(21)
LT/(Ir × Z)
2.22
1.89
1.97
2.15
1.85
2.05
2.17
1.91
1.89


(22)
(DG2 + (DG2A))/(DG2A)
17.83
16.07
16.07
16.07
16.07
4.62
4.86
4.59
4.56


(23)
fL2/fG1
−1.80
−1.58
−1.54
−1.47
−1.74
−1.33
−1.26
−1.44
−1.44


(24)
R2F/fT
0.27
0.43
0.41
0.37
0.34
0.34
0.32
0.35
0.36


(25)
R2R/fT
0.37
0.72
0.68
0.62
0.56
0.57
0.54
0.58
0.60


(26)
fL2/fT
0.88
0.94
0.89
0.81
0.76
0.74
0.67
0.77
0.80


(29)
(1 − m2T) × m3T
2.86
2.51
2.58
2.61
3.17
2.61
2.69
2.65
2.59


(30)
m2T/m2W
4.41
4.05
4.09
4.12
4.84
4.35
4.18
4.74
4.74


(31)
(1 − m2T/m2W) × (m3T/m3W)
−3.66
−3.55
−3.53
−3.53
−4.48
−3.61
−3.52
−3.92
−3.90


(32)
(1 − m2W) × m3W
1.20
1.07
1.11
1.10
1.17
1.13
1.14
1.13
1.11



fT/fW
4.73
4.71
4.67
4.66
5.64
4.69
4.63
4.97
4.95



ωW
35.441
43.934
41.314
38.201
41.362
37.767
35.418
40.763
41.506









INDUSTRIAL APPLICABILITY
The zoom lens system according to the present invention is applicable to a digital input device such as a digital camera, a mobile telephone, a PDA (Personal Digital Assistance), a surveillance camera in a surveillance system, a Web camera or a vehicle-mounted camera. In particular, the zoom lens system according to the present invention is suitable for a photographing optical system where high image quality is required like in a digital camera.

## Claims

1. A zoom lens system having a plurality of lens units each composed of at least one lens element and,
in order from an object side to an image side, comprising:
a first lens unit having negative optical power and composed of two lens elements;
a second lens unit having positive optical power; and
a third lens unit having positive optical power, wherein
in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along an optical axis such that an interval between the first lens unit and the second lens unit should decrease and that an interval between the second lens unit and the third lens unit should increase, so that magnification change is achieved, wherein
the first lens unit is, in order from the object side to the image side, composed of a first lens element having negative optical power and a second lens element having positive optical power, and wherein
the following condition (26) is satisfied:


0.50<fL2/fT<1.00  (26)


(here, Z=fT/fW>4.0 and ωW>35)
where,
fL2 is a focal length of the second lens element,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.

2. The zoom lens system as claimed in claim 1, wherein on the image side relative to the second lens unit, an aperture diaphragm is arranged that moves along the optical axis integrally with the second lens unit during zooming.

3. The zoom lens system as claimed in claim 1, wherein the second lens element of the first lens unit is a meniscus lens element with the convex surface facing the object side.

4. The zoom lens system as claimed in claim 1, wherein the first lens unit includes at least one lens element having an aspheric surface.

5. The zoom lens system as claimed in claim 1, wherein the first lens unit includes at least two aspheric surfaces.

6. The zoom lens system as claimed in claim 1, wherein the third lens unit is composed of one lens element.

7. The zoom lens system as claimed in claim 6, wherein one lens element of the third lens unit includes an aspheric surface.

8. The zoom lens system as claimed in claim 1, wherein the second lens unit is composed of three lens elements.

9. The zoom lens system as claimed in claim 1, wherein the second lens unit is composed of four lens elements.

10. The zoom lens system as claimed in claim 1, wherein the second lens unit moves in a direction perpendicular to the optical axis.

11. The zoom lens system as claimed in claim 10, wherein the entire system satisfies the following conditions (2) and (3):


YT>Y  (2)



0.05<(Y/YT)/(fT/f)<0.60  (3)

(here, Z=fT/fW>4.0 and ωW>35)
where,
f is a focal length of the entire system,
fT is a focal length of the entire system at a telephoto limit,
Y is an amount of movement in a direction perpendicular to the optical axis at the time of maximum blur compensation in the second lens unit with a focal length f of the entire system,
YT is an amount of movement in a direction perpendicular to the optical axis at the time of maximum blur compensation in the second lens unit with a focal length fT of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.

12. An imaging device capable of outputting an optical image of an object as an electric image signal, comprising:
a zoom lens system that forms the optical image of the object; and
an image sensor that converts the optical image formed by the zoom lens system into the electric image signal, wherein
the zoom lens system has a plurality of lens units each composed of at least one lens element and,
in order from an object side to an image side, comprises:
a first lens unit having negative optical power and composed of two lens elements;
a second lens unit having positive optical power; and
a third lens unit having positive optical power, wherein
in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along an optical axis such that an interval between the first lens unit and the second lens unit should decrease and that an interval between the second lens unit and the third lens unit should increase, so that magnification change is achieved, wherein
the first lens unit is, in order from the object side to the image side, composed of a first lens element having negative optical power and a second lens element having positive optical power, and wherein
the following condition (26) is satisfied:


0.50<fL2/fT<1.00  (26)


(here, Z=fT/fW>4.0 and ωW>35)
where,
fL2 is a focal length of the second lens element,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.

13. A camera for converting an optical image of an object into an electric image signal and then performing at least one of displaying and storing of the converted image signal, comprising
an imaging device including a zoom lens system that forms the optical image of the object and an image sensor that converts the optical image formed by the zoom lens system into the electric image signal, wherein
the zoom lens system has a plurality of lens units each composed of at least one lens element and,
in order from an object side to an image side, comprises:
a first lens unit having negative optical power and composed of two lens elements;
a second lens unit having positive optical power; and
a third lens unit having positive optical power, wherein
in zooming from a wide-angle limit to a telephoto limit during image taking, the individual lens units are moved along an optical axis such that an interval between the first lens unit and the second lens unit should decrease and that an interval between the second lens unit and the third lens unit should increase, so that magnification change is achieved, wherein
the first lens unit is, in order from the object side to the image side, composed of a first lens element having negative optical power and a second lens element having positive optical power, and wherein the following condition (26) is satisfied:


0.50<fL2/fT<1.00  (26)


(here, Z=fT/fW>4.0 and ωW>35)
where,
fL2 is a focal length of the second lens element,
fT is a focal length of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.

14. A zoom lens system having a plurality of lens units each composed of at least one lens element and,
in order from an object side to an image side, comprising:
a first lens unit having negative optical power and composed of two lens elements;
a second lens unit having positive optical power; and
a third lens unit having positive optical power, wherein
in zooming from a wide-angle limit to a telephoto limit during image taking, at least the first lens unit and the second lens unit move along an optical axis, wherein
on the image side relative to the second lens unit, an aperture diaphragm is arranged that moves along the optical axis integrally with the second lens unit during zooming, wherein
the second lens unit has a positive lens element on the most object side, and wherein the following condition (27) is satisfied:


0.40<fL3/fG2<1.00  (27)


where,
fL3 is a focal length of the positive lens element arranged on the most object side of the second lens unit, and
fG2 is a focal length of the second lens unit.

15. The zoom lens system as claimed in claim 14, wherein
the first lens unit, in order from the object side to the image side, comprises:
a lens element having negative optical power; and
a meniscus lens element having positive optical power with the convex surface facing the object side.

16. The zoom lens system as claimed in claim 14, wherein the first lens unit includes at least one lens element having an aspheric surface.

17. The zoom lens system as claimed in claim 14, wherein the first lens unit includes at least two aspheric surfaces.

18. The zoom lens system as claimed in claim 14, wherein the third lens unit is composed of one lens element.

19. The zoom lens system as claimed in claim 18, wherein one lens element of the third lens unit includes an aspheric surface.

20. The zoom lens system as claimed in claim 14, wherein the second lens unit is composed of three lens elements.

21. The zoom lens system as claimed in claim 14, wherein the second lens unit is composed of four lens elements.

22. The zoom lens system as claimed in claim 14, wherein the second lens unit moves in a direction perpendicular to the optical axis.

23. The zoom lens system as claimed in claim 22, wherein the entire system satisfies the following conditions (2) and (3):


YT>Y  (2)



0.05<(Y/YT)/(fT/f)<0.60  (3)

(here, Z=fT/fW>4.0 and ωW>35)
where,
f is a focal length of the entire system,
fT is a focal length of the entire system at a telephoto limit,
Y is an amount of movement in a direction perpendicular to the optical axis at the time of maximum blur compensation in the second lens unit with a focal length f of the entire system,
YT is an amount of movement in a direction perpendicular to the optical axis at the time of maximum blur compensation in the second lens unit with a focal length fT of the entire system at a telephoto limit,
fW is a focal length of the entire system at a wide-angle limit, and
ωW is a half value (°) of the maximum view angle at a wide-angle limit.

24. An imaging device capable of outputting an optical image of an object as an electric image signal, comprising:
a zoom lens system that forms the optical image of the object; and
an image sensor that converts the optical image formed by the zoom lens system into the electric image signal, wherein
the zoom lens system has a plurality of lens units each composed of at least one lens element and,
in order from an object side to an image side, comprises:
a first lens unit having negative optical power and composed of two lens elements;
a second lens unit having positive optical power; and
a third lens unit having positive optical power, wherein
in zooming from a wide-angle limit to a telephoto limit during image taking, at least the first lens unit and the second lens unit move along an optical axis, wherein
on the image side relative to the second lens unit, an aperture diaphragm is arranged that moves along the optical axis integrally with the second lens unit during zooming, wherein
the second lens unit has a positive lens element on the most object side, and wherein
the following condition (27) is satisfied:


0.40<fL3/fG2<1.00  (27)


where,
fL3 is a focal length of the positive lens element arranged on the most object side of the second lens unit, and
fG2 is a focal length of the second lens unit.

25. A camera for converting an optical image of an object into an electric image signal and then performing at least one of displaying and storing of the converted image signal, comprising
an imaging device including a zoom lens system that forms the optical image of the object and an image sensor that converts the optical image formed by the zoom lens system into the electric image signal, wherein
the zoom lens system has a plurality of lens units each composed of at least one lens element and,
in order from an object side to an image side, comprises:
a first lens unit having negative optical power and composed of two lens elements;
a second lens unit having positive optical power; and
a third lens unit having positive optical power, wherein
in zooming from a wide-angle limit to a telephoto limit during image taking, at least the first lens unit and the second lens unit move along an optical axis, wherein
on the image side relative to the second lens unit, an aperture diaphragm is arranged that moves along the optical axis integrally with the second lens unit during zooming, wherein the second lens unit has a positive lens element on the most object side, and wherein the following condition (27) is satisfied:


0.40<fL3/fG2<1.00  (27)


where,
fL3 is a focal length of the positive lens element arranged on the most object side of the second lens unit, and
fG2 is a focal length of the second lens unit.