Abstract:
A zoom lens system includes a negative first lens group, a positive second lens group and a positive third lens group, in this order from the object. 
     Upon zooming, the first lens group, the second lens group and the third lens group are moved along the optical axis. 
     The first lens group includes a negative first lens element, a negative second lens element, and a positive third lens element. 
     The second lens group includes a cemented lens having a positive first lens element and a negative second lens element, and a meniscus lens element having the concave surface facing toward the image. 
     The zoom lens system satisfies the following conditions: 
       −0.4&lt; f 23/ f 24&lt;0.4  (1) 
       0.7&lt; f 3/ ft &lt;1.3  (2)       wherein   f23: the combined focal length of the cemented lens;   f24: the focal length of the meniscus lens element;   f3: the focal length of the third lens group; and   ft: the focal length of the zoom lens system at the long focal length extremity.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    1. Field of the Invention 
         [0002]    The present invention relates to a zoom lens system and an electronic imaging device that uses such a zoom lens system, for use in a digital camera, etc. 
         [0003]    2. Description of Related Art 
         [0004]    In a retractable zoom lens system which retracts the lens groups thereof by reducing the distances (spaces) therebetween during a lens-retracting operation and has a zoom ratio of approximately 3, it is common to utilize three lens groups of a negative-lead type zoom lens system in order to achieve further miniaturization thereof, as disclosed in, e.g., Japanese Unexamined Patent Publication Nos. 2002-48975, 2005-37727, 2006-276897 and 2007-286577. 
         [0005]    Furthermore, zoom lens systems which use many glass aspherical lens elements in order to achieve a zoom ratio of approximately 3.6 and a wide angle-of-view at the wide extremity (short focal length extremity) are known in the art, as disclosed in, e.g., in Japanese Unexamined Patent Publication Nos. 2005-099091, 2005-084647, 2005-084648 and 2005-084649. 
         [0006]    Moreover, it is common to utilize a zoom lens system that has four lens groups of a positive-lead type zoom lens system having a zoom ratio exceeding 4. 
         [0007]    In the zoom lens systems taught in the above-mentioned Japanese Unexamined Patent Publication Nos. 2002-48975, 2005-37727, 2006-276897 and 2007-286577 (the negative-lead type zoom lens system), since the zoom ratio thereof is approximately 3, the zooming capability is insufficient. Moreover, if such types of zoom lens systems are used to achieve a zoom ratio of approximately 4.0, the size of the lens elements thereof becomes too large; and, if an attempt is made to miniaturize such lens systems while attaining the same optical quality, the number of lens elements has to be increased, and many glass aspherical lens elements have to be used, which undesirably increases production costs. For example, in the zoom lens systems disclosed in the above-mentioned Japanese Unexamined Patent Publication Nos. 2005-099091, 2005-084647, 2005-084648 and 2005-084649, since a large number of glass aspherical lens elements are used, the production costs thereof are high, and miniaturization of the zoom lens systems is insufficient. 
         [0008]    On the other hand, in the positive-lead type zoom lens system having four lens groups, the overall length thereof when in use can be shortened even if the zoom ratio is increased. However, since the number of lens groups increases, it is difficult to reduce the overall length of the zoom lens system when retracted to the accommodated position, and the diameter of the first lens group becomes large. Consequently, miniaturization of the positive-lead type zoom lens system is insufficient. 
         [0009]    Accordingly, a further miniaturized negative-lead type zoom lens system of three lens groups, which has a zoom ratio of approximately 4.0 and can be produced at low costs, is desired. 
       SUMMARY OF THE INVENTION 
       [0010]    The present invention has been devised in view of the above-mentioned problems, and provides a further miniaturized negative-lead type zoom lens system of three lens groups which has a zoom ratio of approximately 4.0 and can be produced at low costs. 
         [0011]    According to an aspect of the present invention, there is provided a zoom lens system including a first lens group having a negative refractive power (hereinafter, a negative first lens group), a second lens group having a positive refractive power (hereinafter, a positive second lens group) and a third lens group having a positive refractive power (hereinafter, a positive third lens group), in this order from the object. 
         [0012]    Upon zooming from the short focal length extremity to the long focal length extremity, each of the negative first lens group, the positive second lens group and the positive third lens group is moved along the optical axis thereof. 
         [0013]    The negative first lens group includes a first lens element having a negative refractive power (hereinafter, a negative first lens element), a second lens element having a negative refractive power (hereinafter, a negative second lens element), and a third lens element having a positive refractive power (hereinafter, a positive third lens element), in this order from the object. 
         [0014]    The positive second lens group includes a cemented lens having a positive first lens element and a negative second lens element in this order from the object, and a meniscus lens element having the concave surface facing toward the image, in this order from the object. 
         [0015]    The zoom lens system satisfies the following conditions: 
         [0000]      −0.4 &lt;f 23 /f 24&lt;0.4  (1) 
         [0000]      0.7 &lt;f 3 /f&lt; 1.3  (2) 
         [0016]    wherein 
         [0017]    f 23  designates the combined focal length of the cemented lens of the positive second lens group; 
         [0018]    f 24  designates the focal length of the meniscus lens element, of the positive second lens group, having the concave surface facing toward the image; 
         [0019]    f 3  designates the focal length of the positive third lens group; and 
         [0020]    ft designates the focal length of the entire zoom lens system at the long focal length extremity. 
         [0021]    The zoom lens system preferably satisfies the following condition when condition (2) is satisfied: 
         [0000]      0.7 &lt;f 3 /ft&lt; 1.2  (2a) 
         [0022]    The zoom lens system preferably satisfies the following conditions: 
         [0000]      0.3 &lt;f 11 /f 12&lt;1.3  (3) 
         [0000]      −0.14&lt;( R 15 −R 14)/( R 15 +R 14)&lt;0.14  (4) 
         [0023]    wherein 
         [0024]    f 11  designates the focal length of the negative first lens element of the negative first lens group; 
         [0025]    f 12  designates the focal length of the negative second lens element of the negative first lens group; 
         [0026]    R 14  designates the radius of curvature of the image-side surface of the negative second lens element of the negative first lens group; and 
         [0027]    R 15  designates the radius of curvature of the object-side surface of the positive third lens element of the negative first lens group. 
         [0028]    Furthermore, the zoom lens system preferably satisfies the following condition when condition (4) is satisfied: 
         [0000]      −0.14&lt;( R 15 −R 14)/( R 15 +R 14)&lt;0.10  (4a) 
         [0029]    The positive third lens group includes a single positive lens element, and preferably satisfies the following condition: 
         [0000]      1.05&lt;β3 t/β 3 w&lt; 1.3  (5) 
         [0030]    wherein 
         [0031]    β 3   t  designates the lateral magnification of the positive third lens group at the long focal length extremity when an object at infinity is in an in-focus state; and 
         [0032]    β 3   w  designates the lateral magnification of the positive third lens group at the short focal length extremity when an object at infinity is in an in-focus state. 
         [0033]    The negative second lens element and the positive third lens element in the negative first lens group are made of resin, and each of these lens elements have at least one aspherical surface; and, the meniscus lens element, in the positive second lens group, is made of resin, has the concave surface facing toward the image, and has at least one aspherical surface. 
         [0034]    These lens resin elements preferably satisfy the following condition: 
         [0000]      | f 1 /f 1 p−f 2 /f 2 p|&lt; 0.6  (6) 
         [0035]    wherein 
         [0036]    f 1  designates the focal length of the negative first lens group; 
         [0037]    f 1   p  designates the combined focal length of the resin lens elements in the negative first lens group; 
         [0038]    f 2  designates the focal length of the positive second lens group; and 
         [0039]    f 2   p  designates the combined focal length of the resin lens element in the positive second lens group. 
         [0040]    Furthermore, the zoom lens system preferably satisfies the following condition when condition (6) is satisfied: 
         [0000]      | f 1 /f 1 p−f 2 /f 2 p|&lt; 0.45  (6a) 
         [0041]    The positive third lens group preferably includes a resin lens element having at least one aspherical surface, and moves along the optical axis towards an object when focusing from an object at infinity to an object at a closer distance is performed. 
         [0042]    In an embodiment, an electronic imaging device is provided, including the above described rear focus wide-angle lens system. 
         [0043]    According to another aspect of the present invention, there is provided a zoom lens system including a negative first lens group, a positive second lens group and a positive third lens group, in this order from the object. 
         [0044]    Upon zooming from the short focal length extremity to the long focal length extremity, each of the negative first lens group, the positive second lens group and the positive third lens group is moved along the optical axis thereof. 
         [0045]    The negative first lens group includes a negative first lens element, a negative second lens element, and a positive third lens element, in this order from the object. 
         [0046]    The positive second lens group includes a cemented lens having a positive first lens element and a negative second lens element, and a meniscus lens element having the concave surface facing toward the image, in this order from the object. 
         [0047]    The zoom lens system satisfies the following conditions: 
         [0000]      0.3 &lt;f 11 /f 12&lt;1.3  (3) 
         [0000]      −0.14&lt;( R 15 −R 14)/( R 15 +R 14)&lt;0.14  (4) 
         [0048]    wherein 
         [0049]    f 11  designates the focal length of the negative first lens element of the negative first lens group; 
         [0050]    f 12  designates the focal length of the negative second lens element of the negative first lens group; 
         [0051]    R 14  designates the radius of curvature of the image-side surface of the negative second lens element of the negative first lens group; and 
         [0052]    R 15  designates the radius of curvature of the object-side surface of the positive third lens element of the negative first lens group. 
         [0053]    Furthermore, the zoom lens system preferably satisfies the following condition when condition (4) is satisfied: 
         [0000]      −0.14&lt;( R 15 −R 14)/( R 15 +R 14)&lt;0.10  (4a) 
         [0054]    According to the present invention, a further miniaturized negative-lead type zoom lens system of three lens groups, which has a zoom ratio of approximately 4.0 and can be produced at low costs, is provided: 
         [0055]    The present disclosure relates to subject matter contained in Japanese Patent Applications No. 2008-300327 (filed on Nov. 26, 2008) and No. 2009-193296 (filed on Aug. 24, 2009) which are expressly incorporated herein in their entirety. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0056]    The present invention will be discussed below in detail with reference to the accompanying drawings, in which: 
           [0057]      FIG. 1  shows a lens arrangement of a first embodiment of a zoom lens system according to the present invention; 
           [0058]      FIGS. 2A ,  2 B,  2 C and  2 D show aberrations of the lens arrangement shown in  FIG. 1  at the short focal length extremity when an object at infinity is in an in-focus state; 
           [0059]      FIGS. 3A ,  3 B,  3 C and  3 D show aberrations of the lens arrangement shown in  FIG. 1  at an intermediate focal length position when an object at infinity is in an in-focus state; 
           [0060]      FIGS. 4A ,  4 B,  4 C and  4 D show aberrations of the lens arrangement shown in  FIG. 1  at the long focal length extremity when an object at infinity is in an in-focus state; 
           [0061]      FIG. 5  shows a lens arrangement of a second embodiment of a zoom lens system according to the present invention; 
           [0062]      FIGS. 6A ,  6 B,  6 C and  6 D show aberrations of the lens arrangement shown in  FIG. 5  at the short focal length extremity when an object at infinity is in an in-focus state; 
           [0063]      FIGS. 7A ,  7 B,  7 C and  7 D show aberrations of the lens arrangement shown in  FIG. 5  at an intermediate focal length position when an object at infinity is in an in-focus state; 
           [0064]      FIGS. 8A ,  8 B,  8 C and  8 D show aberrations of the lens arrangement shown in  FIG. 5  at the long focal length extremity when an object at infinity is in an in-focus state; 
           [0065]      FIG. 9  shows a lens arrangement of a third embodiment of a zoom lens system according to the present invention; 
           [0066]      FIGS. 10A ,  10 B,  10 C and  10 D show aberrations of the lens arrangement shown in  FIG. 9  at the short focal length extremity when an object at infinity is in an in-focus state; 
           [0067]      FIGS. 11A ,  11 B,  11 C and  11 D show aberrations of the lens arrangement shown in  FIG. 9  at an intermediate focal length position when an object at infinity is in an in-focus state; 
           [0068]      FIGS. 12A ,  12 B,  12 C and  12 D show aberrations of the lens arrangement shown in  FIG. 9  at the long focal length extremity when an object at infinity is in an in-focus state; 
           [0069]      FIG. 13  shows a lens arrangement of a fourth embodiment of a zoom lens system according to the present invention; 
           [0070]      FIGS. 14A ,  14 B,  14 C and  14 D show aberrations of the lens arrangement shown in  FIG. 13  at the short focal length extremity when an object at infinity is in an in-focus state; 
           [0071]      FIGS. 15A ,  15 B,  15 C and  15 D show aberrations of the lens arrangement shown in  FIG. 13  at an intermediate focal length position when an object at infinity is in an in-focus state; 
           [0072]      FIGS. 16A ,  16 B,  16 C and  16 D show aberrations of the lens arrangement shown in  FIG. 13  at the long focal length extremity when an object at infinity is in an in-focus state; 
           [0073]      FIG. 17  shows a lens arrangement of a fifth embodiment of a zoom lens system according to the present invention; 
           [0074]      FIGS. 18A ,  18 B,  18 C and  18 D show aberrations of the lens arrangement shown in  FIG. 17  at the short focal length extremity when an object at infinity is in an in-focus state; 
           [0075]      FIGS. 19A ,  19 B,  19 C and  19 D show aberrations of the lens arrangement shown in  FIG. 17  at an intermediate focal length position when an object at infinity is in an in-focus state; 
           [0076]      FIGS. 20A ,  20 B,  20 C and  20 D show aberrations of the lens arrangement shown in  FIG. 17  at the long focal length extremity when an object at infinity is in an in-focus state; 
           [0077]      FIG. 21  shows a lens arrangement of a sixth embodiment of a zoom lens system according to the present invention; 
           [0078]      FIGS. 22A ,  22 B,  22 C and  22 D show aberrations of the lens arrangement shown in  FIG. 21  at the short focal length extremity when an object at infinity is in an in-focus state; 
           [0079]      FIGS. 23A ,  23 B,  23 C and  23 D show aberrations of the lens arrangement shown in  FIG. 21  at an intermediate focal length position when an object at infinity is in an in-focus state; 
           [0080]      FIGS. 24A ,  24 B,  24 C and  24 D show aberrations of the lens arrangement shown in  FIG. 21  at the long focal length extremity when an object at infinity is in an in-focus state; 
           [0081]      FIG. 25  shows a lens arrangement of a seventh embodiment of a zoom lens system according to the present invention; 
           [0082]      FIGS. 26A ,  26 B,  26 C and  26 D show aberrations of the lens arrangement shown in  FIG. 25  at the short focal length extremity when an object at infinity is in an in-focus state; 
           [0083]      FIGS. 27A ,  27 B,  27 C and  27 D show aberrations of the lens arrangement shown in  FIG. 25  at an intermediate focal length position when an object at infinity is in an in-focus state; 
           [0084]      FIGS. 28A ,  28 B,  28 C and  28 D show aberrations of the lens arrangement shown in  FIG. 25  at the long focal length extremity when an object at infinity is in an in-focus state; 
           [0085]      FIG. 29  shows a lens arrangement of an eighth embodiment of a zoom lens system according to the present invention; 
           [0086]      FIGS. 30A ,  30 B,  30 C and  30 D show aberrations of the lens arrangement shown in  FIG. 29  at the short focal length extremity when an object at infinity is in an in-focus state; 
           [0087]      FIGS. 31A ,  31 B,  31 C and  31 D show aberrations of the lens arrangement shown in  FIG. 29  at an intermediate focal length position when an object at infinity is in an in-focus state; 
           [0088]      FIGS. 32A ,  32 B,  32 C and  32 D show aberrations of the lens arrangement shown in  FIG. 29  at the long focal length extremity when an object at infinity is in an in-focus state; 
           [0089]      FIG. 33  shows a lens arrangement of a ninth embodiment of a zoom lens system according to the present invention; 
           [0090]      FIGS. 34A ,  34 B,  34 C and  34 D show aberrations of the lens arrangement shown in  FIG. 33  at the short focal length extremity when an object at infinity is in an in-focus state; 
           [0091]      FIGS. 35A ,  35 B,  35 C and  35 D show aberrations of the lens arrangement shown in  FIG. 33  at an intermediate focal length position when an object at infinity is in an in-focus state; 
           [0092]      FIGS. 36A ,  36 B,  36 C and  36 D show aberrations of the lens arrangement shown in  FIG. 33  at the long focal length extremity when an object at infinity is in an in-focus state; 
           [0093]      FIG. 37  shows a lens arrangement of a tenth embodiment of a zoom lens system according to the present invention; 
           [0094]      FIGS. 38A ,  38 B,  38 C and  38 D show aberrations of the lens arrangement shown in  FIG. 37  at the short focal length extremity when an object at infinity is in an in-focus state; 
           [0095]      FIGS. 39A ,  39 B,  39 C and  39 D show aberrations of the lens arrangement shown in  FIG. 37  at an intermediate focal length position when an object at infinity is in an in-focus state; 
           [0096]      FIGS. 40A ,  40 B,  40 C and  40 D show aberrations of the lens arrangement shown in  FIG. 37  at the long focal length extremity when an object at infinity is in an in-focus state; 
           [0097]      FIG. 41  shows a lens arrangement of an eleventh embodiment of a zoom lens system according to the present invention; 
           [0098]      FIGS. 42A ,  42 B,  42 C and  42 D show aberrations of the lens arrangement shown in  FIG. 41  at the short focal length extremity when an object at infinity is in an in-focus state; 
           [0099]      FIGS. 43A ,  43 B,  43 C and  43 D show aberrations of the lens arrangement shown in  FIG. 41  at an intermediate focal length position when an object at infinity is in an in-focus state; 
           [0100]      FIGS. 44A ,  44 B,  44 C and  44 D show aberrations of the lens arrangement shown in  FIG. 41  at the long focal length extremity when an object at infinity is in an in-focus state; 
           [0101]      FIG. 45  shows a lens arrangement of a twelfth embodiment of a zoom lens system according to the present invention; 
           [0102]      FIGS. 46A ,  46 B,  46 C and  46 D show aberrations of the lens arrangement shown in  FIG. 45  at the short focal length extremity when an object at infinity is in an in-focus state; 
           [0103]      FIGS. 47A ,  47 B,  47 C and  47 D show aberrations of the lens arrangement shown in  FIG. 45  at an intermediate focal length position when an object at infinity is in an in-focus state; 
           [0104]      FIGS. 48A ,  48 B,  48 C and  48 D show aberrations of the lens arrangement shown in  FIG. 45  at the long focal length extremity when an object at infinity is in an in-focus state; and 
           [0105]      FIG. 49  is the schematic view of the lens-group moving paths for the zoom lens system according to the present invention. 
       
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
       [0106]    The zoom lens system of the present invention, as shown in the lens-group moving paths of  FIG. 49 , includes a negative first lens group  10 , a diaphragm S, a positive second lens group  20 , and a positive third lens group  30 , in this order from the object. ‘I’ designates the imaging plane where the light-receiving surface of a CCD (an electronic imaging device) is positioned. Two optical filters (e.g., a cover glass), which are not shown, are provided in front of the CCD. 
         [0107]    A focusing operation on an object at infinity to an object at a close distance is performed by moving the positive third lens group  30  along the optical axis toward the object. 
         [0108]    Upon zooming from the short focal length extremity (Wide) to the long focal length extremity (Tele), the negative first lens group  10 , the positive second lens group  20  and the positive third lens group  30  each move along the optical axis. More specifically, upon zooming from the short focal length extremity to the long focal length extremity, the negative first lens group  10  initially moves toward the image and thereafter moves toward the object, the positive second lens group  20  monotonically moves toward the object, and the positive third lens group  30  monotonically moves toward the image. The diaphragm S (fixed aperture stop) is provided between the negative first lens group  10  and the positive second lens group  20 , and integrally moves with the positive second lens group  20  upon zooming. 
         [0109]    As shown in each embodiments of  FIGS. 1 ,  5 ,  9 ,  13 ,  17 ,  21 ,  25 ,  29 ,  33 ,  37 ,  41  and  45 , the negative first lens group  10  includes a negative first lens element  11 , a negative second lens element  12  and a positive third lens element  13 , in this order from the object. 
         [0110]    The positive second lens group  20  includes a cemented lens  23  having a positive first lens element  21  and a negative second lens element  22 , and a meniscus lens element  24  having the concave surface facing toward the image, in this order from the object. This weak powered meniscus lens element  24  can either have a positive or negative refractive power. 
         [0111]    The positive third lens group  30  includes a single positive lens element  31 . 
         [0112]    In the all embodiments, the second lens element  12  of the negative first lens group  10 , the meniscus lens element  24  of the positive second lens group  20 , and the single positive lens element  31  are constituted by resin lens elements, and are made aspherical on both surfaces thereof. 
         [0113]    In the embodiments except the second and ninth embodiments, the positive third lens element  13  of the negative first lens group  10  is constituted by a resin lens element, and is made aspherical on both surfaces thereof. 
         [0114]    Condition (1) is to determine a ratio, f 23 /f 24 , of the combined focal length f 23  of the cemented lens  23  (the positive first lens element  21  and the negative second lens element  22  of the positive second lens group  20 ) to the focal length f 24  of the meniscus lens element  24  (having the concave surface facing toward the image) of the positive second lens group  20 , in order to achieve a high zoom ratio, while an increase of the overall length of the zoom lens system is prevented. 
         [0115]    If f 23 /f 24  exceeds the lower limit of condition (1), the correcting of spherical aberrations becomes difficult. 
         [0116]    If f 23 /f 24  exceeds the upper limit of condition (1), the principal point of the positive second lens group  20  approaches the image, so that the overall length of the zoom lens system becomes longer. Moreover, the refractive power of the negative first lens group  10  becomes stronger. As a result, the correcting of field curvature and astigmatism becomes difficult. 
         [0117]    Condition (2) is to determine a ratio, f 3 /ft, of the focal length f 3  of the positive third lens group  30  to the focal length ft of the entire zoom lens system at the long focal length extremity, in order to attain better telecentricity, while an increase of the overall length of the zoom lens system is prevented. 
         [0118]    If f 3 /ft exceeds the lower limit of condition (2), the correcting of field curvature and astigmatism becomes difficult. 
         [0119]    If f 3 /ft exceeds the upper limit of condition (2), the telecentricity of the zoom lens system deteriorates. 
         [0120]    Condition (3) is to determine a ratio, f 11 /f 12 , of the focal length f 11  of the negative first lens element  11  to the focal length f 12  in the negative second lens element  12  of the negative first lens group  10 , in order to suitably perform the correcting of aberrations, while an increase of the size of the zoom lens system is prevented. Furthermore, condition (3) is provided for suitably distributing the negative refractive power of the negative first lens group  10  over the negative first lens element  11  and the negative second lens element  12 . 
         [0121]    If f 11 /f 12  exceeds the lower limit of condition (3), the thickness, at the optical axis position, of the negative first lens element  11  becomes noticeably different from that of, at the peripheral area of the negative first lens element  11 , so that the thickness of the negative first lens group  10  becomes larger. 
         [0122]    If f 11 /f 12  exceeds the upper limit of condition (3), the refractive power of the negative first lens element  11  becomes insufficient, so that the diameter of the negative first lens element  11  has to be increased in order to strengthen the refractive power. 
         [0123]    Condition (4) concerns the shaping factor of an air lens defined between the image-side surface of the negative second lens element  12  and the object-side surface of the positive third lens element  13  in the negative first lens group  10 , in order to suitably perform the correcting of aberrations and to determine the shape of the above-mentioned air lens, while an increase of the size of the zoom lens system is prevented. 
         [0124]    If (R 15 −R 14 )/(R 15 +R 14 ) exceeds the lower limit of condition (4), the air distance between the peripheral area of the negative second lens element  12  and that of the positive third lens element  13  becomes longer, so that the thickness (length in the optical axis direction) of the negative first lens group  10  increases. 
         [0125]    If (R 15 −R 14 )/(R 15 +R 14 ) exceeds the upper limit of condition (4), the correcting of astigmatism becomes difficult. 
         [0126]    Condition (5) determines a ratio, β 3   t /β 3   w , of the lateral magnification β 3   t  of the positive third lens group at the long focal length extremity to the lateral magnification β 3   w  thereof at the short focal length extremity when an object at infinity is in an in-focus state, in order to achieve a high zoom ratio, while an increase of the overall length of the zoom lens system is prevented, when the positive third lens group  30  is constituted by a single positive lens element. 
         [0127]    If β 3   t /β 3   w  exceeds the lower limit of condition (5), zooming has to be substantially performed by the negative first lens group  10  and the positive second lens group  20  only. Consequently, the size of the negative first lens group  10  and that of the positive second lens group  20  become larger. Moreover, the refractive power of the negative first lens group  10  and that of the positive second lens group  20  become stronger, so that the correcting of field curvature and astigmatism becomes difficult. 
         [0128]    If β 3   t /β 3   w  exceeds the upper limit of condition (5), zooming has to be substantially performed by the positive third lens group  30  only. Consequently, the traveling distance of the positive third lens group  30  becomes longer, so that it becomes difficult to secure the back focal distance. Moreover, the refractive power of the positive third lens group  30  becomes stronger, so that the change of field curvature becomes larger when focusing on a close-distant object is performed by the positive third lens group  30 . 
         [0129]    Condition (6) concerns the difference between a ratio f 1 /f 1   p  to a ratio f 2 /f 2   p  when the negative second lens element  12  and the positive third lens element  13 , in the negative first lens group  10 , are respectively constituted by a resin lens element having at least one aspherical surface; and, the meniscus lens element  24 , in the positive second lens group  20 , having the concave surface facing toward the image is constituted by a resin lens element having at least one aspherical surface. 
         [0130]    Here, f 1  designates the focal length of the negative first lens group  10 ; f 1   p  designates the combined focal length of the resin lens elements (the negative second lens element  12  and the positive third lens element  13 ) in the negative first lens group  10 ; f 2  designates the focal length of the positive second lens group  20 ; and f 2   p  designates the combined focal length of the resin lens element (the meniscus lens element  24 ) in the positive second lens group  20 . 
         [0131]    By satisfying this condition, focal shift due to a change in temperature in the resin lens elements (i.e., the negative second lens element  12  and the positive third lens element  13  in the negative first lens group  10 , and the meniscus lens element  24  in the positive second lens group  20 ) can be reduced; and the refractive power of the resin lens elements can be suitably maintained so as not to be too strong. 
         [0132]    Specific numerical data of the embodiments will be described hereinafter. 
         [0133]    In the diagrams of chromatic aberration (axial chromatic aberration) represented by spherical aberration, the solid line and the two types of dotted lines respectively indicate spherical aberrations with respect to the d, g and C lines. 
         [0134]    In the diagrams of lateral chromatic aberration, W designates the half angle-of-view, the two types of dotted lines respectively indicate magnification with respect to the g and C lines; however, the d line as the base line coincides with the ordinate. 
         [0135]    In the diagrams of astigmatism, W designates the half angle-of-view, S designates the sagittal image, and M designates the meridional image. 
         [0136]    In the diagrams of distortion, y designates the image height. 
         [0137]    In the tables, FNO. designates the F-number, f designates the focal length of the entire lens system, W designates the half angle-of-view) (°), fB designates the back focal distance (the distance between the image-side surface of the most image-side cover glass to the imaging plane), L designates the length of the lens system, r designates the radius of curvature, d designates the lens-element thickness or a distance between lens elements (lens groups), N d  designates the refractive index of the d-line, and v designates the Abbe number. 
         [0138]    FNO., f, W, fB, L and d (which changes according to zooming) are shown in the following order: “the short focal length extremity”, “an intermediate focal length position” and “the long focal length extremity”. 
         [0139]    In addition to the above, an aspherical surface which is symmetrical with respect to the optical axis is defined as follows: 
         [0000]        x=cy   2 /(1+[1−{1 +K}c   2   y   2 ] 1/2 )+ A 4 y   4   +A 6 y   6   +A 8 y   8   +A 10 y   10    
         [0140]    wherein: 
         [0141]    c designates a curvature of the aspherical vertex (1/r); 
         [0142]    y designates a distance from the optical axis; 
         [0143]    K designates the conic coefficient; and 
         [0144]    A 4  designates a fourth-order aspherical coefficient; 
         [0145]    A 6  designates a sixth-order aspherical coefficient; 
         [0146]    A 8  designates a eighth-order aspherical coefficient; and 
         [0147]    A 10  designates a tenth-order aspherical coefficient. 
       Embodiment 1 
       [0148]      FIG. 1  shows the lens arrangement of a first embodiment of a zoom lens system according to the present invention.  FIGS. 2A through 2D  show aberrations of the lens arrangement shown in  FIG. 1  at the short focal length extremity when an object at infinity is in an in-focus state.  FIGS. 3A through 3D  show aberrations of the lens arrangement shown in  FIG. 1  at an intermediate focal length position when an object at infinity is in an in-focus state.  FIGS. 4A through 4D  show aberrations of the lens arrangement shown in  FIG. 1  at the long focal length extremity when an object at infinity is in an in-focus state. 
         [0149]    Table 1 shows the lens-surface data of the zoom lens system, Table 2 shows the aspherical-surface data, Table 3 shows the data on the variable values according to zooming, and Table 4 shows lens-group data. 
         [0150]    The zoom lens system of the first embodiment includes a negative first lens group  10 , a diaphragm S, a positive second lens group  20 , and a positive third lens group  30 , in this order from the object. Two optical filters OP 1  and OP  2  are provided between the positive third lens group  30  and the imaging plane I where the light-receiving surface of a CCD (an electronic imaging device) is positioned. 
         [0151]    The negative first lens group  10  includes a negative meniscus lens element  11  having the convex surface facing toward the object, a negative meniscus lens element  12  having the convex surface facing toward the object, and a positive meniscus lens element  13  having the convex surface facing toward the object, in this order from the object. The negative meniscus lens element  12  and the positive meniscus lens element  13  are respectively formed as resin lens elements, each of which has aspherical surfaces on both surfaces thereof. 
         [0152]    The positive second lens group  20  includes a cemented lens  23  having a biconvex positive lens element  21  and a biconcave negative lens element  22 , and a positive meniscus lens element  24  having the concave surface facing toward the image, in this order from the object. The positive meniscus lens element  24  is formed as a resin lens element having aspherical surfaces on both sides thereof. 
         [0153]    The positive third lens group  30  includes a single biconvex positive lens element  31  formed as a resin lens element having aspherical surfaces on both surface thereof. Note that in each embodiment, lens elements having aspherical surfaces on both side are resin lens elements. 
         [0154]    The diaphragm S is provided at a position where the diaphragm S contacts surface No. 7, i.e., the front surface of the cemented lens (lens element  21 ) of the positive second lens group  20 . 
         [0000]    
       
         
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 1 
               
             
             
               
                   
               
               
                 Surface Data 
               
             
          
           
               
                   
                 Surf. No. 
                 r 
                 d 
                 Nd 
                 ν 
               
               
                   
                   
               
             
          
           
               
                   
                  1 
                 48.000 
                 0.700 
                 1.71300 
                 53.9 
               
               
                   
                  2 
                 6.474 
                 1.958 
               
               
                   
                  3* 
                 13.733 
                 1.000 
                 1.54358 
                 55.7 
               
               
                   
                  4* 
                 6.240 
                 0.200 
               
               
                   
                  5* 
                 7.017 
                 2.100 
                 1.60641 
                 27.2 
               
               
                   
                  6* 
                 27.206 
                 D6  
               
               
                   
                  7 
                 4.760 
                 2.000 
                 1.88300 
                 40.8 
               
               
                   
                  8 
                 −7.461 
                 0.500 
                 1.76182 
                 26.6 
               
               
                   
                  9 
                 4.803 
                 0.550 
               
               
                   
                 10* 
                 4.556 
                 1.100 
                 1.54358 
                 55.7 
               
               
                   
                 11* 
                 4.866 
                 D11 
               
               
                   
                 12* 
                 25.454 
                 1.800 
                 1.54358 
                 55.7 
               
               
                   
                 13* 
                 −14.566 
                 D13 
               
               
                   
                 14 
                 ∞ 
                 0.350 
                 1.51633 
                 64.1 
               
               
                   
                 15 
                 ∞ 
                 0.510 
               
               
                   
                 16 
                 ∞ 
                 0.500 
                 1.51633 
                 64.1 
               
               
                   
                 17 
                 ∞ 
                 — 
               
               
                   
                   
               
               
                   
                 The symbol * designates the aspherical surface which is rotationally symmetrical with respect to the optical axis. 
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
               
             
               
               
               
               
               
               
             
           
               
                 TABLE 2 
               
             
             
               
                   
               
               
                 Aspherical surface data (the aspherical surface 
               
               
                 coefficients not indicated are zero (0.00)): 
               
             
          
           
               
                 Surf. No. 
                 K 
                 A4 
                 A6 
                 A8 
                 A10 
               
               
                   
               
             
          
           
               
                 3 
                 0.000 
                 −0.7710 × 10 −3   
                   0.2171 × 10 −4   
                 −0.3441 × 10 −6   
                 −0.2859 × 10 −1   
               
               
                 4 
                 0.000 
                 −0.1289 × 10 −2   
                   0.1633 × 10 −4   
                 −0.1413 × 10 −5   
                 0.0000 
               
               
                 5 
                 0.000 
                 −0.2118 × 10 −3   
                 −0.7521 × 10 −5   
                 −0.4613 × 10 −6   
                 0.0000 
               
               
                 6 
                 0.000 
                 −0.1931 × 10 −3   
                   0.2654 × 10 −5   
                 0.0000 
                 0.0000 
               
               
                 10 
                 0.000 
                 −0.3265 × 10 −2   
                 −0.3366 × 10 −3   
                 −0.6428 × 10 −4   
                   0.1456 × 10 −5   
               
               
                 11 
                 0.000 
                   0.1016 × 10 −2   
                 −0.1369 × 10 −3   
                 −0.9476 × 10 −4   
                   0.1000 × 10 −4   
               
               
                 12 
                 0.000 
                   0.5690 × 10 −3   
                 −0.2479 × 10 −4   
                   0.9607 × 10 −6   
                 0.0000 
               
               
                 13 
                 0.000 
                   0.9701 × 10 −3   
                 −0.4473 × 10 −4   
                   0.1381 × 10 −5   
                 0.0000 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 3 
               
             
             
               
                   
               
               
                 Lens Data (Zoom Ratio = 3.88) 
               
             
          
           
               
                   
                 Short Focal 
                 Intermediate 
                 Long Focal 
               
               
                   
                 Length 
                 Focal Length 
                 Length 
               
               
                   
                 Extremity 
                 Position 
                 Extremity 
               
               
                   
                   
               
             
          
           
               
                   
                 FNO. = 
                 2.6 
                 3.7 
                 6.0 
               
               
                   
                 f = 
                 5.00 
                 9.62 
                 19.42 
               
               
                   
                 W = 
                 39.8 
                 22.9 
                 11.6 
               
               
                   
                 fB = 
                 0.59 
                 0.59 
                 0.59 
               
               
                   
                 L = 
                 36.03 
                 32.37 
                 37.09 
               
               
                   
                 D6 = 
                 14.425 
                 5.691 
                 0.895 
               
               
                   
                 D11 = 
                 3.296 
                 8.843 
                 19.313 
               
               
                   
                 D13 = 
                 3.053 
                 2.576 
                 1.624 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 4 
               
             
             
               
                   
               
               
                 Lens Group Data of Zoom Lens System 
               
             
          
           
               
                 Lens Group 
                 First Surf. No. 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 1 
                 1 
                 −13.31 
               
               
                 2 
                 7 
                 10.15 
               
               
                 3 
                 12 
                 17.32 
               
               
                   
               
             
          
         
       
     
       Embodiment 2 
       [0155]      FIG. 5  shows the lens arrangement of the second embodiment of a zoom lens system according to the present invention.  FIGS. 6A through 6D  show aberrations of the lens arrangement shown in  FIG. 5  at the short focal length extremity when an object at infinity is in an in-focus state.  FIGS. 7A through 7D  show aberrations of the lens arrangement shown in  FIG. 5  at an intermediate focal length position when an object at infinity is in an in-focus state.  FIGS. 8A through 8D  show aberrations of the lens arrangement shown in  FIG. 5  at the long focal length extremity when an object at infinity is in an in-focus state. 
         [0156]    Table 5 shows the lens-surface data of the zoom lens system, Table 6 shows the aspherical-surface data, Table 7 shows the data on the variable values according to zooming, and Table 8 shows lens-group data. 
         [0157]    The basic lens arrangement of the second embodiment is the same as that of the first embodiment except that the positive meniscus lens element  13  is not a resin aspherical lens element. 
         [0158]    The diaphragm S is provided at a position where the diaphragm S contacts surface No. 7, i.e., the front surface of the cemented lens (lens element  21 ) of the positive second lens group  20 . 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 5 
               
             
             
               
                   
               
               
                 Surface Data 
               
             
          
           
               
                 Surf. No. 
                 r 
                 d 
                 Nd 
                 ν 
               
               
                   
               
             
          
           
               
                 1 
                 48.000 
                 0.700 
                 1.72000 
                 50.3 
               
               
                 2 
                 6.483 
                 2.133 
               
               
                  3* 
                 13.103 
                 1.000 
                 1.54358 
                 55.7 
               
               
                  4* 
                 10.708 
                 0.200 
               
               
                 5 
                 10.854 
                 1.500 
                 1.94595 
                 18.0 
               
               
                 6 
                 16.478 
                 D6 
               
               
                 7 
                 4.748 
                 1.800 
                 1.88300 
                 40.8 
               
               
                 8 
                 −7.911 
                 0.600 
                 1.76182 
                 26.6 
               
               
                 9 
                 4.700 
                 0.550 
               
               
                 10* 
                 4.339 
                 1.100 
                 1.54358 
                 55.7 
               
               
                 11* 
                 4.794 
                 D11 
               
               
                 12* 
                 28.719 
                 1.800 
                 1.54358 
                 55.7 
               
               
                 13* 
                 −13.690 
                 D13 
               
               
                 14  
                 ∞ 
                 0.350 
                 1.51633 
                 64.1 
               
               
                 15  
                 ∞ 
                 0.510 
               
               
                 16  
                 ∞ 
                 0.500 
                 1.51633 
                 64.1 
               
               
                 17  
                 ∞ 
                 — 
               
               
                   
               
               
                 The symbol * designates the aspherical surface which is rotationally symmetrical with respect to the optical axis. 
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
             
           
               
                 TABLE 6 
               
               
                   
               
               
                 Aspherical surface data (the aspherical surface 
               
               
                 coefficients not indicated are zero (0.00)): 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surf. 
                   
                   
                   
               
               
                   
                 No. 
                 K 
                 A4 
                 A6 
               
               
                   
                   
               
               
                   
                 3 
                 0.000 
                 −0.7710 × 10 −3   
                  0.2171 × 10 −4   
               
               
                   
                 4 
                 0.000 
                 −0.1076 × 10 −2   
                  0.2597 × 10 −4   
               
               
                   
                 10 
                 0.000 
                 −0.2769 × 10 −2   
                 −0.2695 × 10 −3   
               
               
                   
                 11 
                 0.000 
                  0.1583 × 10 −2   
                 −0.5542 × 10 −4   
               
               
                   
                 12 
                 0.000 
                  0.4704 × 10 −3   
                 −0.2924 × 10 −4   
               
               
                   
                 13 
                 0.000 
                  0.8178 × 10 −3   
                 −0.4361 × 10 −4   
               
               
                   
                   
               
             
          
           
               
                   
                 Surf. 
                   
                   
               
               
                   
                 No. 
                 A8 
                 A10 
               
               
                   
                   
               
               
                   
                 3 
                 −0.3441 × 10 −6   
                 −0.2859 × 10 −8   
               
               
                   
                 4 
                 −0.6720 × 10 −6   
                 0.0000 
               
               
                   
                 10 
                 −0.7599 × 10 −4   
                 0.1750 × 10 −5   
               
               
                   
                 11 
                 −0.1187 × 10 −3   
                 0.1074 × 10 −4   
               
               
                   
                 12 
                  0.7774 × 10 −6   
                 0.0000 
               
               
                   
                 13 
                  0.1022 × 10 −5   
                 0.0000 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 7 
               
             
             
               
                   
               
               
                 Lens Data (Zoom Ratio = 3.88) 
               
             
          
           
               
                   
                 Short Focal 
                 Intermediate 
                 Long Focal 
               
               
                   
                 Length 
                 Focal Length 
                 Length 
               
               
                   
                 Extremity 
                 Position 
                 Extremity 
               
               
                   
                   
               
             
          
           
               
                   
                 FNO. = 
                 2.7 
                 3.8 
                 6.0 
               
               
                   
                 f = 
                 5.00 
                 9.62 
                 19.42 
               
               
                   
                 W = 
                 39.7 
                 22.9 
                 11.6 
               
               
                   
                 fB = 
                 0.59 
                 0.59 
                 0.59 
               
               
                   
                 L = 
                 36.04 
                 31.73 
                 35.70 
               
               
                   
                 D6 = 
                 15.185 
                 5.994 
                 0.956 
               
               
                   
                 D11 = 
                 2.926 
                 8.326 
                 18.406 
               
               
                   
                 D13 = 
                 3.196 
                 2.673 
                 1.606 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 8 
               
             
             
               
                   
               
               
                 Lens Group Data of Zoom Lens System 
               
             
          
           
               
                 Lens Group 
                 First Surf. No. 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 1 
                 1 
                 −14.12 
               
               
                 2 
                 7 
                 10.19 
               
               
                 3 
                 12 
                 17.31 
               
               
                   
               
             
          
         
       
     
       Embodiment 3 
       [0159]      FIG. 9  shows the lens arrangement of the third embodiment of a zoom lens system according to the present invention.  FIGS. 10A through 10D  show aberrations of the lens arrangement shown in  FIG. 9  at the short focal length extremity when an object at infinity is in an in-focus state.  FIGS. 11A through 11D  show aberrations of the lens arrangement shown in  FIG. 9  at an intermediate focal length position when an object at infinity is in an in-focus state.  FIGS. 12A through 12D  show aberrations of the lens arrangement shown in  FIG. 9  at the long focal length extremity when an object at infinity is in an in-focus state. 
         [0160]    Table 9 shows the lens-surface data of the zoom lens system, Table 10 shows the aspherical-surf ace data, Table 11 shows the data on the variable values according to zooming, and Table 12 shows lens-group data. 
         [0161]    The basic lens arrangement of the third embodiment is the same as that of the first embodiment, and only the numerical data shown in Tables 9 through 12 differ. 
         [0162]    The diaphragm S is provided at a position where the diaphragm S contacts surface No. 7, i.e., the front surface of the cemented lens (lens element  21 ) of the positive second lens group  20 . 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 9 
               
             
             
               
                   
               
               
                 Surface Data 
               
             
          
           
               
                 Surf. No. 
                 r 
                 d 
                 Nd 
                 ν 
               
               
                   
               
             
          
           
               
                 1 
                 54.766 
                 0.700 
                 1.71300 
                 53.9 
               
               
                 2 
                 7.590 
                 1.586 
               
               
                  3* 
                 15.575 
                 1.000 
                 1.54358 
                 55.7 
               
               
                  4* 
                 5.873 
                 0.514 
               
               
                  5* 
                 6.225 
                 2.100 
                 1.60641 
                 27.2 
               
               
                  6* 
                 17.212 
                 D6 
               
               
                 7 
                 4.732 
                 2.000 
                 1.88300 
                 40.8 
               
               
                 8 
                 −7.320 
                 0.500 
                 1.76182 
                 26.6 
               
               
                 9 
                 4.754 
                 0.550 
               
               
                 10* 
                 4.551 
                 1.100 
                 1.54358 
                 55.7 
               
               
                 11* 
                 4.860 
                 D11 
               
               
                 12* 
                 21.432 
                 1.800 
                 1.54358 
                 55.7 
               
               
                 13* 
                 −15.612 
                 D13 
               
               
                 14  
                 ∞ 
                 0.350 
                 1.51633 
                 64.1 
               
               
                 15  
                 ∞ 
                 0.510 
               
               
                 16  
                 ∞ 
                 0.500 
                 1.51633 
                 64.1 
               
               
                 17  
                 ∞ 
                 — 
               
               
                   
               
               
                 The symbol * designates the aspherical surface which is rotationally symmetrical with respect to the optical axis. 
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
             
           
               
                 TABLE 10 
               
               
                   
               
               
                 Aspherical surface data (the aspherical surface 
               
               
                 coefficients not indicated are zero (0.00)): 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surf. 
                   
                   
                   
               
               
                   
                 No. 
                 K 
                 A4 
                 A6 
               
               
                   
                   
               
               
                   
                 3 
                 0.000 
                 −0.9948 × 10 −4   
                  0.1423 × 10 −4   
               
               
                   
                 4 
                 0.000 
                 −0.7445 × 10 −3   
                  0.2971 × 10 −4   
               
               
                   
                 5 
                 0.000 
                 −0.5205 × 10 −3   
                  0.7716 × 10 −5   
               
               
                   
                 6 
                 0.000 
                 −0.1796 × 10 −3   
                 −0.1107 × 10 −5   
               
               
                   
                 10 
                 0.000 
                 −0.3472 × 10 −2   
                 −0.3413 × 10 −3   
               
               
                   
                 11 
                 0.000 
                  0.7712 × 10 −3   
                 −0.1059 × 10 −3   
               
               
                   
                 12 
                 0.000 
                  0.5751 × 10 −3   
                 −0.2896 × 10 −4   
               
               
                   
                 13 
                 0.000 
                  0.9516 × 10 −3   
                 −0.4898 × 10 −4   
               
               
                   
                   
               
             
          
           
               
                   
                 Surf. 
                   
                   
               
               
                   
                 No. 
                 A8 
                 A10 
               
               
                   
                   
               
               
                   
                 3 
                 −0.5036 × 10 −6   
                 0.4426 × 10 −8   
               
               
                   
                 4 
                 −0.1599 × 10 −5   
                 0.0000 
               
               
                   
                 5 
                 −0.7044 × 10 −6   
                 0.0000 
               
               
                   
                 6 
                  0.0000 
                 0.0000 
               
               
                   
                 10 
                 −0.6872 × 10 −4   
                 0.1160 × 10 −5   
               
               
                   
                 11 
                 −0.1065 × 10 −3   
                 0.1082 × 10 −4   
               
               
                   
                 12 
                  0.9558 × 10 −6   
                 0.0000 
               
               
                   
                 13 
                  0.1354 × 10 −5   
                 0.0000 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 11 
               
             
             
               
                   
               
               
                 Lens Data (Zoom Ratio = 3.88) 
               
             
          
           
               
                   
                 Short Focal 
                 Intermediate 
                 Long Focal 
               
               
                   
                 Length 
                 Focal Length 
                 Length 
               
               
                   
                 Extremity 
                 Position 
                 Extremity 
               
               
                   
                   
               
             
          
           
               
                   
                 FNO. = 
                 2.6 
                 3.7 
                 6.0 
               
               
                   
                 f = 
                 5.00 
                 9.62 
                 19.42 
               
               
                   
                 w = 
                 39.8 
                 22.9 
                 11.6 
               
               
                   
                 fB = 
                 0.59 
                 0.59 
                 0.59 
               
               
                   
                 L = 
                 36.04 
                 31.96 
                 36.51 
               
               
                   
                 D6 = 
                 14.737 
                 5.722 
                 0.949 
               
               
                   
                 D11 = 
                 3.119 
                 8.385 
                 18.758 
               
               
                   
                 D13 = 
                 2.980 
                 2.652 
                 1.601 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 12 
               
             
             
               
                   
               
               
                 Lens Group Data of Zoom Lens System 
               
             
          
           
               
                 Lens Group 
                 First Surf. No. 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 1 
                 1 
                 −13.75 
               
               
                 2 
                 7 
                 10.11 
               
               
                 3 
                 12 
                 16.91 
               
               
                   
               
             
          
         
       
     
       Embodiment 4 
       [0163]      FIG. 13  shows the lens arrangement of the fourth embodiment of a zoom lens system according to the present invention.  FIGS. 14A through 14D  show aberrations of the lens arrangement shown in  FIG. 13  at the short focal length extremity when an object at infinity is in an in-focus state.  FIGS. 15A through 15D  show aberrations of the lens arrangement shown in  FIG. 13  at an intermediate focal length position when an object at infinity is in an in-focus state.  FIGS. 16A through 16D  show aberrations of the lens arrangement shown in  FIG. 13  at the long focal length extremity when an object at infinity is in an in-focus state. 
         [0164]    Table 13 shows the lens-surface data of the zoom lens system, Table 14 shows the aspherical-surface data, Table 15 shows the data on the variable values according to zooming, and Table 16 shows lens-group data. 
         [0165]    The basic lens arrangement of the fourth embodiment is the same as that of the first embodiment, and only the numerical data shown in Tables 13 through 16 differ. 
         [0166]    The diaphragm S is provided at a position where the diaphragm S contacts surface No. 7, i.e., the front surface of the cemented lens (lens element  21 ) of the positive second lens group  20 . 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 13 
               
             
             
               
                   
               
               
                 Surface Data 
               
             
          
           
               
                 Surf. No. 
                 r 
                 d 
                 Nd 
                 ν 
               
               
                   
               
             
          
           
               
                 1 
                 68.030 
                 0.700 
                 1.69680 
                 55.5 
               
               
                 2 
                 10.108 
                 1.247 
               
               
                  3* 
                 22.833 
                 1.000 
                 1.54358 
                 55.7 
               
               
                  4* 
                 5.719 
                 0.853 
               
               
                  5* 
                 5.926 
                 2.100 
                 1.60641 
                 27.2 
               
               
                  6* 
                 13.283 
                 D6 
               
               
                 7 
                 4.766 
                 2.000 
                 1.88300 
                 40.8 
               
               
                 8 
                 −7.426 
                 0.500 
                 1.76182 
                 26.6 
               
               
                 9 
                 4.790 
                 0.550 
               
               
                 10* 
                 4.586 
                 1.100 
                 1.54358 
                 55.7 
               
               
                 11* 
                 4.908 
                 D11 
               
               
                 12* 
                 19.160 
                 1.800 
                 1.54358 
                 55.7 
               
               
                 13* 
                 −17.349 
                 D13 
               
               
                 14  
                 ∞ 
                 0.350 
                 1.51633 
                 64.1 
               
               
                 15  
                 ∞ 
                 0.510 
               
               
                 16  
                 ∞ 
                 0.500 
                 1.51633 
                 64.1 
               
               
                 17  
                 ∞ 
                 — 
               
               
                   
               
               
                 The symbol * designates the aspherical surface which is rotationally symmetrical with respect to the optical axis. 
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
             
           
               
                 TABLE 14 
               
               
                   
               
               
                 Aspherical surface data (the aspherical surface 
               
               
                 coefficients not indicated are zero (0.00)): 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surf. 
                   
                   
                   
               
               
                   
                 No. 
                 K 
                 A4 
                 A6 
               
               
                   
                   
               
               
                   
                 3 
                 0.000 
                  0.3855 × 10 −3   
                  0.4537 × 10 −5   
               
               
                   
                 4 
                 0.000 
                 −0.6457 × 10 −3   
                  0.5670 × 10 −4   
               
               
                   
                 5 
                 0.000 
                 −0.1039 × 10 −2   
                  0.2796 × 10 −4   
               
               
                   
                 6 
                 0.000 
                 −0.3049 × 10 −3   
                 −0.1155 × 10 −5   
               
               
                   
                 10 
                 0.000 
                 −0.3215 × 10 −2   
                 −0.3050 × 10 −3   
               
               
                   
                 11 
                 0.000 
                  0.9505 × 10 −3   
                 −0.9294 × 10 −4   
               
               
                   
                 12 
                 0.000 
                  0.5741 × 10 −3   
                 −0.2488 × 10 −4   
               
               
                   
                 13 
                 0.000 
                  0.9255 × 10 −3   
                 −0.4512 × 10 −4   
               
               
                   
                   
               
             
          
           
               
                   
                 Surf. 
                   
                   
               
               
                   
                 No. 
                 A8 
                 A10 
               
               
                   
                   
               
               
                   
                 3 
                 −0.3887 × 10 −6   
                 0.4282 × 10 −8   
               
               
                   
                 4 
                 −0.2031 × 10 −5   
                 0.0000 
               
               
                   
                 5 
                 −0.1046 × 10 −5   
                 0.0000 
               
               
                   
                 6 
                  0.0000 
                 0.0000 
               
               
                   
                 10 
                 −0.7334 × 10 −4   
                 0.2029 × 10 −5   
               
               
                   
                 11 
                 −0.1018 × 10 −3   
                 0.1002 × 10 −4   
               
               
                   
                 12 
                  0.1098 × 10 −5   
                 0.0000 
               
               
                   
                 13 
                  0.1552 × 10 −5   
                 0.0000 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 15 
               
             
             
               
                   
               
               
                 Lens Data (Zoom Ratio = 3.88) 
               
             
          
           
               
                   
                 Short Focal 
                 Intermediate 
                 Long Focal 
               
               
                   
                 Length 
                 Focal Length 
                 Length 
               
               
                   
                 Extremity 
                 Position 
                 Extremity 
               
               
                   
                   
               
             
          
           
               
                   
                 FNO. = 
                 2.7 
                 3.7 
                 5.9 
               
               
                   
                 f = 
                 5.00 
                 9.62 
                 19.42 
               
               
                   
                 W = 
                 39.8 
                 22.9 
                 11.6 
               
               
                   
                 fB = 
                 0.59 
                 0.59 
                 0.59 
               
               
                   
                 L = 
                 37.04 
                 31.91 
                 35.89 
               
               
                   
                 D6 = 
                 15.841 
                 6.030 
                 1.000 
               
               
                   
                 D11 = 
                 3.112 
                 7.966 
                 18.076 
               
               
                   
                 D13 = 
                 2.883 
                 2.711 
                 1.610 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 16 
               
             
             
               
                   
               
               
                 Lens Group Data of Zoom Lens System 
               
             
          
           
               
                 Lens Group 
                 First Surf. No. 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 1 
                 1 
                 −14.50 
               
               
                 2 
                 7 
                 10.22 
               
               
                 3 
                 12 
                 17.05 
               
               
                   
               
             
          
         
       
     
       Embodiment 5 
       [0167]      FIG. 17  shows the lens arrangement of the fifth embodiment of a zoom lens system according to the present invention.  FIGS. 18A through 18D  show aberrations of the lens arrangement shown in  FIG. 17  at the short focal length extremity when an object at infinity is in an in-focus state.  FIGS. 19A through 19D  show aberrations of the lens arrangement shown in  FIG. 17  at an intermediate focal length position when an object at infinity is in an in-focus state.  FIGS. 20A through 20D  show aberrations of the lens arrangement shown in  FIG. 17  at the long focal length extremity when an object at infinity is in an in-focus state. 
         [0168]    Table 17 shows the lens-surface data of the zoom lens system, Table 18 shows the aspherical-surface data, Table 19 shows the data on the variable values according to zooming, and Table 20 shows lens-group data. 
         [0169]    The basic lens arrangement of the fifth embodiment is the same as that of the first embodiment, and only the numerical data shown in Tables 17 through 20 differ. 
         [0170]    The diaphragm S is provided at a position where the diaphragm S contacts surface No. 7, i.e., the front surface of the cemented lens (lens element  21 ) of the positive second lens group  20 . 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 17 
               
             
             
               
                   
               
               
                 Surface Data 
               
             
          
           
               
                 Surf. No. 
                 r 
                 d 
                 Nd 
                 ν 
               
               
                   
               
             
          
           
               
                 1 
                 38.097 
                 0.700 
                 1.71300 
                 53.9 
               
               
                 2 
                 6.308 
                 1.686 
               
               
                  3* 
                 11.905 
                 0.900 
                 1.54358 
                 55.7 
               
               
                  4* 
                 6.168 
                 0.414 
               
               
                  5* 
                 6.919 
                 2.200 
                 1.60641 
                 27.2 
               
               
                  6* 
                 21.635 
                 D6 
               
               
                 7 
                 4.823 
                 2.000 
                 1.88300 
                 40.8 
               
               
                 8 
                 −7.571 
                 0.500 
                 1.76182 
                 26.6 
               
               
                 9 
                 4.962 
                 0.550 
               
               
                 10* 
                 4.472 
                 1.100 
                 1.54358 
                 55.7 
               
               
                 11* 
                 4.612 
                 D11 
               
               
                 12* 
                 23.130 
                 1.800 
                 1.54358 
                 55.7 
               
               
                 13* 
                 −15.213 
                 D13 
               
               
                 14  
                 ∞ 
                 0.350 
                 1.51633 
                 64.1 
               
               
                 15  
                 ∞ 
                 0.510 
               
               
                 16  
                 ∞ 
                 0.500 
                 1.51633 
                 64.1 
               
               
                 17  
                 ∞ 
                 — 
               
               
                   
               
               
                 The symbol * designates the aspherical surface which is rotationally symmetrical with respect to the optical axis. 
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
             
           
               
                 TABLE 18 
               
               
                   
               
               
                 Aspherical surface data (the aspherical surface 
               
               
                 coefficients not indicated are zero (0.00)): 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surf. 
                   
                   
                   
               
               
                   
                 No. 
                 K 
                 A4 
                 A6 
               
               
                   
                   
               
               
                   
                 3 
                 0.000 
                 −0.3106 × 10 −3   
                  0.2220 × 10 −4   
               
               
                   
                 4 
                 0.000 
                 −0.1331 × 10 −2   
                  0.3417 × 10 −4   
               
               
                   
                 5 
                 0.000 
                 −0.7254 × 10 −3   
                  0.4135 × 10 −5   
               
               
                   
                 6 
                 0.000 
                 −0.2969 × 10 −3   
                 −0.5746 × 10 −5   
               
               
                   
                 10 
                 0.000 
                 −0.2886 × 10 −2   
                 −0.3329 × 10 −3   
               
               
                   
                 11 
                 0.000 
                  0.1352 × 10 −2   
                 −0.1541 × 10 −3   
               
               
                   
                 12 
                 0.000 
                  0.5950 × 10 −3   
                 −0.2604 × 10 −4   
               
               
                   
                 13 
                 0.000 
                  0.1002 × 10 −2   
                 −0.4480 × 10 −4   
               
               
                   
                   
               
             
          
           
               
                   
                 Surf. 
                   
                   
               
               
                   
                 No. 
                 A8 
                 A10 
               
               
                   
                   
               
               
                   
                 3 
                 −0.6500 × 10 −6   
                 0.2771 × 10 −8   
               
               
                   
                 4 
                 −0.1472 × 10 −5   
                 0.0000 
               
               
                   
                 5 
                 −0.3974 × 10 −6   
                 0.0000 
               
               
                   
                 6 
                  0.0000 
                 0.0000 
               
               
                   
                 10 
                 −0.5819 × 10 −4   
                 0.1040 × 10 −5   
               
               
                   
                 11 
                 −0.8629 × 10 −4   
                 0.8181 × 10 −5   
               
               
                   
                 12 
                  0.7132 × 10 −6   
                 0.0000 
               
               
                   
                 13 
                  0.1043 × 10 −5   
                 0.0000 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 19 
               
             
             
               
                   
               
               
                 Lens Data (Zoom Ratio = 3.88) 
               
             
          
           
               
                   
                 Short Focal 
                 Intermediate 
                 Long Focal 
               
               
                   
                 Length 
                 Focal Length 
                 Length 
               
               
                   
                 Extremity 
                 Position 
                 Extremity 
               
               
                   
                   
               
             
          
           
               
                   
                 FNO. = 
                 2.7 
                 3.7 
                 5.9 
               
               
                   
                 f = 
                 5.00 
                 9.62 
                 19.42 
               
               
                   
                 W = 
                 38.7 
                 22.7 
                 11.5 
               
               
                   
                 fB = 
                 0.59 
                 0.59 
                 0.59 
               
               
                   
                 L = 
                 36.54 
                 32.23 
                 36.71 
               
               
                   
                 D6 = 
                 15.069 
                 5.813 
                 0.816 
               
               
                   
                 D11 = 
                 3.250 
                 8.539 
                 18.882 
               
               
                   
                 D13 = 
                 3.016 
                 2.675 
                 1.811 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 20 
               
             
             
               
                   
               
               
                 Lens Group Data of Zoom Lens System 
               
             
          
           
               
                 Lens Group 
                 First Surf. No. 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 1 
                 1 
                 −13.84 
               
               
                 2 
                 7 
                 10.26 
               
               
                 3 
                 12 
                 17.17 
               
               
                   
               
             
          
         
       
     
       Embodiment 6 
       [0171]      FIG. 21  shows the lens arrangement of the sixth embodiment of a zoom lens system according to the present invention.  FIGS. 22A through 22D  show aberrations of the lens arrangement shown in  FIG. 21  at the short focal length extremity when an object at infinity is in an in-focus state.  FIGS. 23A through 23D  show aberrations of the lens arrangement shown in  FIG. 21  at an intermediate focal length position when an object at infinity is in an in-focus state.  FIGS. 24A through 24D  show aberrations of the lens arrangement shown in  FIG. 21  at the long focal length extremity when an object at infinity is in an in-focus state. 
         [0172]    Table 21 shows the lens-surface data of the zoom lens system, Table 22 shows the aspherical-surf ace data, Table 23 shows the data on the variable values according to zooming, and Table 24 shows lens-group data. 
         [0173]    The basic lens arrangement of the sixth embodiment is the same as that of the first embodiment, and only the numerical data shown in Tables 21 through 24 differ. 
         [0174]    The diaphragm S is provided at a position where the diaphragm S contacts surface No. 7, i.e., the front surface of the cemented lens (lens element  21 ) of the positive second lens group  20 . 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 21 
               
             
             
               
                   
               
               
                 Surface Data 
               
             
          
           
               
                 Surf. No. 
                 r 
                 d 
                 Nd 
                 ν 
               
               
                   
               
             
          
           
               
                 1 
                 63.734 
                 0.700 
                 1.64000 
                 60.2 
               
               
                 2 
                 9.260 
                 0.953 
               
               
                  3* 
                 16.000 
                 0.900 
                 1.54358 
                 55.7 
               
               
                  4* 
                 5.982 
                 1.147 
               
               
                  5* 
                 6.380 
                 2.200 
                 1.60641 
                 27.2 
               
               
                  6* 
                 11.603 
                 D6 
               
               
                 7 
                 4.771 
                 2.000 
                 1.88300 
                 40.8 
               
               
                 8 
                 −7.508 
                 0.500 
                 1.74077 
                 27.8 
               
               
                 9 
                 4.174 
                 0.218 
               
               
                 10* 
                 4.126 
                 1.100 
                 1.54358 
                 55.7 
               
               
                 11* 
                 5.030 
                 D11 
               
               
                 12* 
                 19.891 
                 1.800 
                 1.54358 
                 55.7 
               
               
                 13* 
                 −14.999 
                 D13 
               
               
                 14  
                 ∞ 
                 0.350 
                 1.51633 
                 64.1 
               
               
                 15  
                 ∞ 
                 0.510 
               
               
                 16  
                 ∞ 
                 0.500 
                 1.51633 
                 64.1 
               
               
                 17  
                 ∞ 
                 — 
               
               
                   
               
               
                 The symbol * designates the aspherical surface which is rotationally symmetrical with respect to the optical axis. 
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
             
           
               
                 TABLE 22 
               
               
                   
               
               
                 Aspherical surface data (the aspherical surface 
               
               
                 coefficients not indicated are zero (0.00)): 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surf. 
                   
                   
                   
               
               
                   
                 No. 
                 K 
                 A4 
                 A6 
               
               
                   
                   
               
               
                   
                 3 
                 0.000 
                 0.1006 × 10 −2   
                 −0.2516 × 10 −4   
               
               
                   
                 4 
                 0.000 
                 0.3805 × 10 −3   
                  0.3170 × 10 −4   
               
               
                   
                 5 
                 0.000 
                 −0.9179 × 10 −3   
                  0.4467 × 10 −4   
               
               
                   
                 6 
                 0.000 
                 −0.6248 × 10 −3   
                  0.2167 × 10 −4   
               
               
                   
                 10 
                 0.000 
                 −0.2206 × 10 −2   
                 −0.2499 × 10 −3   
               
               
                   
                 11 
                 0.000 
                 0.2396 × 10 −2   
                 −0.6754 × 10 −6   
               
               
                   
                 12 
                 0.000 
                 0.4901 × 10 −3   
                 −0.2937 × 10 −4   
               
               
                   
                 13 
                 0.000 
                 0.9244 × 10 −3   
                 −0.4765 × 10 −4   
               
               
                   
                   
               
             
          
           
               
                 Surf. 
                   
                   
               
               
                 No. 
                 A8 
                 A10 
               
               
                   
               
               
                 3 
                  0.3418 × 10 −6   
                 −0.3173 × 10 −8   
               
               
                 4 
                 −0.1575 × 10 −5   
                 0.0000 
               
               
                 5 
                 −0.1329 × 10 −5   
                 0.1286 × 10 −8   
               
               
                 6 
                 −0.6199 × 10 −6   
                 0.0000 
               
               
                 10 
                 −0.7006 × 10 −4   
                 0.1612 × 10 −6   
               
               
                 11 
                 −0.9791 × 10 −4   
                 0.7753 × 10 −5   
               
               
                 12 
                  0.1214 × 10 −5   
                 0.0000 
               
               
                 13 
                  0.1605 × 10 −5   
                 0.0000 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 23 
               
             
             
               
                   
               
               
                 Lens Data (Zoom Ratio = 3.88) 
               
             
          
           
               
                   
                 Short Focal 
                 Intermediate 
                 Long Focal 
               
               
                   
                 Length 
                 Focal Length 
                 Length 
               
               
                   
                 Extremity 
                 Position 
                 Extremity 
               
               
                   
                   
               
             
          
           
               
                   
                 FNO. = 
                 2.7 
                 3.7 
                 5.9 
               
               
                   
                 f = 
                 5.00 
                 9.62 
                 19.42 
               
               
                   
                 W = 
                 38.7 
                 22.6 
                 11.4 
               
               
                   
                 fB = 
                 0.59 
                 0.59 
                 0.59 
               
               
                   
                 L = 
                 36.54 
                 31.98 
                 36.14 
               
               
                   
                 D6 = 
                 15.481 
                 6.085 
                 1.000 
               
               
                   
                 D11 = 
                 3.249 
                 8.415 
                 18.454 
               
               
                   
                 D13 = 
                 2.941 
                 2.610 
                 1.813 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 24 
               
             
             
               
                   
               
               
                 Lens Group Data of Zoom Lens System 
               
             
          
           
               
                 Lens Group 
                 First Surf. No. 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 1 
                 1 
                 −14.54 
               
               
                 2 
                 7 
                 10.22 
               
               
                 3 
                 12 
                 16.02 
               
               
                   
               
             
          
         
       
     
       Embodiment 7 
       [0175]      FIG. 25  shows the lens arrangement of the seventh embodiment of a zoom lens system according to the present invention.  FIGS. 26A through 26D  show aberrations of the lens arrangement shown in  FIG. 25  at the short focal length extremity when an object at infinity is in an in-focus state.  FIGS. 27A through 27D  show aberrations of the lens arrangement shown in  FIG. 25  at an intermediate focal length position when an object at infinity is in an in-focus state.  FIGS. 28A through 28D  show aberrations of the lens arrangement shown in  FIG. 25  at the long focal length extremity when an object at infinity is in an in-focus state. 
         [0176]    Table 25 shows the lens-surface data of the zoom lens system, Table 26 shows the aspherical-surf ace data, Table 27 shows the data on the variable values according to zooming, and Table 28 shows lens-group data. 
         [0177]    The basic lens arrangement of the seventh embodiment is the same as that of the first embodiment except that in the positive second lens group  20 , the meniscus lens element having the concave surface facing toward the image is provided with a negative refractive power. 
         [0178]    The diaphragm S is provided at a position where the diaphragm S contacts surface No. 7, i.e., the front surface of the cemented lens (lens element  21 ) of the positive second lens group  20 . 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 25 
               
             
             
               
                   
               
               
                 Surface Data 
               
             
          
           
               
                 Surf. No. 
                 r 
                 d 
                 Nd 
                 ν 
               
               
                   
               
             
          
           
               
                 1 
                 37.618 
                 0.700 
                 1.61800 
                 63.4 
               
               
                 2 
                 5.563 
                 1.804 
               
               
                  3* 
                 12.000 
                 1.000 
                 1.54358 
                 55.7 
               
               
                  4* 
                 8.016 
                 0.388 
               
               
                  5* 
                 7.295 
                 2.000 
                 1.60641 
                 27.2 
               
               
                  6* 
                 13.624 
                 D6 
               
               
                 7 
                 5.103 
                 1.900 
                 1.88300 
                 40.8 
               
               
                 8 
                 −10.734 
                 0.500 
                 1.84666 
                 23.8 
               
               
                 9 
                 15.048 
                 0.400 
               
               
                 10* 
                 200.000 
                 0.900 
                 1.60641 
                 27.2 
               
               
                 11* 
                 11.145 
                 D11 
               
               
                 12* 
                 49.550 
                 1.800 
                 1.54358 
                 55.7 
               
               
                 13* 
                 −15.075 
                 D13 
               
               
                 14  
                 ∞ 
                 0.350 
                 1.51633 
                 64.1 
               
               
                 15  
                 ∞ 
                 0.510 
               
               
                 16  
                 ∞ 
                 0.500 
                 1.51633 
                 64.1 
               
               
                 17  
                 ∞ 
                 — 
               
               
                   
               
               
                 The symbol * designates the aspherical surface which is rotationally symmetrical with respect to the optical axis. 
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 26 
               
             
             
               
                   
               
               
                 Aspherical surface data (the aspherical surface 
               
               
                 coefficients not indicated are zero (0.00)): 
               
             
          
           
               
                 Surf. 
                   
                   
                   
                   
               
               
                 No. 
                 K 
                 A4 
                 A6 
                 A8 
               
               
                   
               
             
          
           
               
                 3 
                 0.000 
                 0.1948 × 10 −2   
                 −0.6276 × 10 −4   
                  0.7502 × 10 −6   
               
               
                 4 
                 0.000 
                 0.1680 × 10 −2   
                 −0.2414 × 10 −4   
                 −0.1921 × 10 −5   
               
               
                 5 
                 0.000 
                 −0.7892 × 10 −3   
                  0.4118 × 10 −4   
                 −0.1602 × 10 −5   
               
               
                 6 
                 0.000 
                 −0.9165 × 10 −3   
                  0.7586 × 10 −5   
                  0.3065 × 10 −6   
               
               
                 10 
                 0.000 
                 0.3573 × 10 −2   
                 −0.4299 × 10 −4   
                 −0.1717 × 10 −4   
               
               
                 11 
                 0.000 
                 0.7537 × 10 −2   
                  0.2240 × 10 −3   
                 −0.5621 × 10 −5   
               
               
                 12 
                 0.000 
                 −0.4639 × 10 −4   
                 −0.9596 × 10 −5   
                 −0.8985 × 10 −6   
               
               
                 13 
                 0.000 
                 0.2784 × 10 −3   
                 −0.2713 × 10 −4   
                 −0.3906 × 10 −6   
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 27 
               
             
             
               
                   
               
               
                 Lens Data (Zoom Ratio = 3.88) 
               
             
          
           
               
                   
                 Short Focal 
                 Intermediate 
                 Long Focal 
               
               
                   
                 Length 
                 Focal Length 
                 Length 
               
               
                   
                 Extremity 
                 Position 
                 Extremity 
               
               
                   
                   
               
             
          
           
               
                   
                 FNO. = 
                 2.7 
                 3.7 
                 6.0 
               
               
                   
                 f = 
                 5.00 
                 9.62 
                 19.41 
               
               
                   
                 W = 
                 38.7 
                 22.8 
                 11.5 
               
               
                   
                 fB = 
                 0.59 
                 0.59 
                 0.59 
               
               
                   
                 L = 
                 36.54 
                 31.93 
                 36.52 
               
               
                   
                 D6 = 
                 14.973 
                 5.555 
                 0.969 
               
               
                   
                 D11 = 
                 3.034 
                 7.917 
                 18.989 
               
               
                   
                 D13 = 
                 3.794 
                 3.715 
                 1.823 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 28 
               
             
             
               
                   
               
               
                 Lens Group Data of Zoom Lens System 
               
             
          
           
               
                 Lens Group 
                 First Surf. No. 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 1 
                 1 
                 −13.30 
               
               
                 2 
                 7 
                 10.11 
               
               
                 3 
                 12 
                 21.47 
               
               
                   
               
             
          
         
       
     
       Embodiment 8 
       [0179]      FIG. 29  shows the lens arrangement of the eighth embodiment of a zoom lens system according to the present invention.  FIGS. 30A through 30D  show aberrations of the lens arrangement shown in  FIG. 29  at the short focal length extremity when an object at infinity is in an in-focus state.  FIGS. 31A through 31D  show aberrations of the lens arrangement shown in  FIG. 29  at an intermediate focal length position when an object at infinity is in an in-focus state.  FIGS. 32A through 32D  show aberrations of the lens arrangement shown in  FIG. 29  at the long focal length extremity when an object at infinity is in an in-focus state. 
         [0180]    Table 29 shows the lens-surface data of the zoom lens system, Table 30 shows the aspherical-surf ace data, Table 31 shows the data on the variable values according to zooming, and Table 32 shows lens-group data. 
         [0181]    The basic lens arrangement of the eighth embodiment is the same as that of the first embodiment and only the numerical data shown in Tables 29 through 32 differ. 
         [0182]    The diaphragm S is provided at a position where the diaphragm S contacts surface No. 7, i.e., the front surface of the cemented lens (lens element  21 ) of the positive second lens group  20 . 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 29 
               
             
             
               
                   
               
               
                 Surface Data 
               
             
          
           
               
                 Surf. No. 
                 r 
                 d 
                 Nd 
                 ν 
               
               
                   
               
             
          
           
               
                 1 
                 67.936 
                 0.700 
                 1.71300 
                 53.9 
               
               
                 2 
                 6.998 
                 1.551 
               
               
                  3* 
                 11.905 
                 0.900 
                 1.54358 
                 55.7 
               
               
                  4* 
                 6.059 
                 0.549 
               
               
                  5* 
                 6.963 
                 2.200 
                 1.60641 
                 27.2 
               
               
                  6* 
                 21.709 
                 D6 
               
               
                 7 
                 4.861 
                 2.000 
                 1.88300 
                 40.8 
               
               
                 8 
                 −7.772 
                 0.500 
                 1.76182 
                 26.6 
               
               
                 9 
                 4.920 
                 0.550 
               
               
                 10* 
                 4.359 
                 1.100 
                 1.54358 
                 55.7 
               
               
                 11* 
                 4.558 
                 D11 
               
               
                 12* 
                 28.646 
                 1.900 
                 1.54358 
                 55.7 
               
               
                 13* 
                 −13.323 
                 D13 
               
               
                 14  
                 ∞ 
                 0.350 
                 1.51633 
                 64.1 
               
               
                 15  
                 ∞ 
                 0.510 
               
               
                 16  
                 ∞ 
                 0.500 
                 1.51633 
                 64.1 
               
               
                 17  
                 ∞ 
                 — 
               
               
                   
               
               
                 The symbol * designates the aspherical surface which is rotationally symmetrical with respect to the optical axis. 
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
             
           
               
                 TABLE 30 
               
               
                   
               
               
                 Aspherical surface data (the aspherical surface 
               
               
                 coefficients not indicated are zero (0.00)): 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surf. 
                   
                   
                   
               
               
                   
                 No. 
                 K 
                 A4 
                 A6 
               
               
                   
                   
               
               
                   
                 3 
                 0.000 
                 −0.3106 × 10 −3   
                  0.2220 × 10 −4   
               
               
                   
                 4 
                 0.000 
                 −0.1223 × 10 −2   
                  0.4536 × 10 −4   
               
               
                   
                 5 
                 0.000 
                 −0.6219 × 10 −3   
                  0.1581 × 10 −4   
               
               
                   
                 6 
                 0.000 
                 −0.2584 × 10 −3   
                  0.1054 × 10 −5   
               
               
                   
                 10 
                 0.000 
                 −0.2668 × 10 −2   
                 −0.3241 × 10 −3   
               
               
                   
                 11 
                 0.000 
                  0.1534 × 10 −2   
                 −0.1814 × 10 −3   
               
               
                   
                 12 
                 0.000 
                  0.6196 × 10 −3   
                 −0.1516 × 10 −4   
               
               
                   
                 13 
                 0.000 
                  0.1049 × 10 −2   
                 −0.2768 × 10 −4   
               
               
                   
                   
               
             
          
           
               
                 Surf. 
                   
                   
               
               
                 No. 
                 A8 
                 A10 
               
               
                   
               
               
                 3 
                 −0.6500 × 10 −6   
                 0.2771 × 10 −8   
               
               
                 4 
                 −0.1917 × 10 −5   
                 0.0000 
               
               
                 5 
                 −0.6449 × 10 −6   
                 0.0000 
               
               
                 6 
                  0.0000 
                 0.0000 
               
               
                 10 
                 −0.6194 × 10 −4   
                 0.1882 × 10 −5   
               
               
                 11 
                 −0.8794 × 10 −4   
                 0.8495 × 10 −5   
               
               
                 12 
                  0.7013 × 10 −6   
                 0.0000 
               
               
                 13 
                  0.9258 × 10 −6   
                 0.0000 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 31 
               
             
             
               
                   
               
               
                 Lens Data (Zoom Ratio = 3.88) 
               
             
          
           
               
                   
                 Short Focal 
                   
                 Long Focal 
               
               
                   
                 Length 
                 Intermediate 
                 Length 
               
               
                   
                 Extremity 
                 Focal Length 
                 Extremity 
               
               
                   
                   
               
             
          
           
               
                   
                 FNO. = 
                 2.6 
                 3.7 
                 5.9 
               
               
                   
                 f = 
                 5.00 
                 9.62 
                 19.41 
               
               
                   
                 W = 
                 39.9 
                 22.6 
                 11.5 
               
               
                   
                 fB = 
                 0.59 
                 0.59 
                 0.59 
               
               
                   
                 L = 
                 37.03 
                 32.66 
                 37.03 
               
               
                   
                 D6 = 
                 15.422 
                 6.031 
                 0.919 
               
               
                   
                 D11 = 
                 3.152 
                 8.588 
                 18.981 
               
               
                   
                 D13 = 
                 3.158 
                 2.744 
                 1.830 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 32 
               
             
             
               
                   
               
               
                 Lens Group Data of Zoom Lens System 
               
             
          
           
               
                 Lens Group 
                 First Surf. No. 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 1 
                 1 
                 −14.05 
               
               
                 2 
                 7 
                 10.44 
               
               
                 3 
                 12 
                 17.00 
               
               
                   
               
             
          
         
       
     
       Embodiment 9 
       [0183]      FIG. 33  shows the lens arrangement of the ninth embodiment of a zoom lens system according to the present invention.  FIGS. 34A through 34D  show aberrations of the lens arrangement shown in  FIG. 33  at the short focal length extremity when an object at infinity is in an in-focus state.  FIGS. 35A through 35D  show aberrations of the lens arrangement shown in  FIG. 33  at an intermediate focal length position when an object at infinity is in an in-focus state.  FIGS. 36A through 36D  show aberrations of the lens arrangement shown in  FIG. 33  at the long focal length extremity when an object at infinity is in an in-focus state. 
         [0184]    Table 33 shows the lens-surface data of the zoom lens system, Table 34 shows the aspherical-surface data, Table 35 shows the data on the variable values according to zooming, and Table 36 shows lens-group data. 
         [0185]    The basic lens arrangement of the ninth embodiment is the same as that of the second embodiment and only the numerical data shown in Tables 33 through 36 differ. The diaphragm S is provided at a position where the diaphragm S contacts surface No. 7, i.e., the front surface of the cemented lens (lens element  21 ) of the positive second lens group  20 . 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 33 
               
             
             
               
                   
               
               
                 Surface Data 
               
             
          
           
               
                 Surf. No. 
                 r 
                 d 
                 Nd 
                 ν 
               
               
                   
               
             
          
           
               
                 1 
                 30.044 
                 0.700 
                 1.72000 
                 50.3 
               
               
                 2 
                 7.065 
                 2.571 
               
               
                  3* 
                 27.380 
                 1.000 
                 1.54358 
                 55.7 
               
               
                  4* 
                 12.456 
                 0.200 
               
               
                 5 
                 9.467 
                 1.500 
                 1.94594 
                 18.0 
               
               
                 6 
                 12.991 
                 D6 
               
               
                 7 
                 4.719 
                 1.800 
                 1.88300 
                 40.8 
               
               
                 8 
                 −7.863 
                 0.600 
                 1.76182 
                 26.6 
               
               
                 9 
                 4.741 
                 0.550 
               
               
                 10* 
                 4.014 
                 1.100 
                 1.54358 
                 55.7 
               
               
                 11* 
                 4.308 
                 D11 
               
               
                 12* 
                 43.104 
                 1.800 
                 1.54358 
                 55.7 
               
               
                 13* 
                 −11.461 
                 D13 
               
               
                 14  
                 ∞ 
                 0.350 
                 1.51633 
                 64.1 
               
               
                 15  
                 ∞ 
                 0.510 
               
               
                 16  
                 ∞ 
                 0.500 
                 1.51633 
                 55.7 
               
               
                 17  
                 ∞ 
                 — 
               
               
                   
               
               
                 The symbol * designates the aspherical surface which is rotationally symmetrical with respect to the optical axis. 
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
             
           
               
                 TABLE 34 
               
               
                   
               
               
                 Aspherical surface data (the aspherical surface 
               
               
                 coefficients not indicated are zero (0.00)): 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surf. 
                   
                   
                   
               
               
                   
                 No. 
                 K 
                 A4 
                 A6 
               
               
                   
                   
               
               
                   
                 3 
                 0.000 
                 −0.7896 × 10 −3   
                  0.2251 × 10 −4   
               
               
                   
                 4 
                 0.000 
                 −0.9238 × 10 −3   
                  0.2759 × 10 −4   
               
               
                   
                 10 
                 0.000 
                 −0.3010 × 10 −2   
                 −0.3940 × 10 −3   
               
               
                   
                 11 
                 0.000 
                  0.1504 × 10 −2   
                 −0.9286 × 10 −4   
               
               
                   
                 12 
                 0.000 
                  0.5870 × 10 −3   
                 −0.2874 × 10 −4   
               
               
                   
                 13 
                 0.000 
                  0.1085 × 10 −2   
                 −0.4917 × 10 −4   
               
               
                   
                   
               
             
          
           
               
                 Surf. 
                   
                   
               
               
                 No. 
                 A8 
                 A10 
               
               
                   
               
               
                 3 
                 −0.3171 × 10 −6   
                 −0.1611 × 10 −8   
               
               
                 4 
                 −0.4950 × 10 −6   
                 0.0000 
               
               
                 10 
                 −0.6527 × 10 −4   
                  0.2043 × 10 −7   
               
               
                 11 
                 −0.1479 × 10 −3   
                  0.1371 × 10 −4   
               
               
                 12 
                  0.6167 × 10 −6   
                 0.0000 
               
               
                 13 
                  0.9812 × 10 −6   
                 0.0000 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 35 
               
             
             
               
                   
               
               
                 Lens Data (Zoom Ratio = 3.88) 
               
             
          
           
               
                   
                 Short Focal 
                   
                 Long Focal 
               
               
                   
                 Length 
                 Intermediate 
                 Length 
               
               
                   
                 Extremity 
                 Focal Length 
                 Extremity 
               
               
                   
                   
               
             
          
           
               
                   
                 FNO. = 
                 2.7 
                 3.7 
                 5.9 
               
               
                   
                 f = 
                 5.00 
                 9.62 
                 19.42 
               
               
                   
                 W = 
                 39.9 
                 22.8 
                 11.6 
               
               
                   
                 fB = 
                 0.59 
                 0.59 
                 0.59 
               
               
                   
                 L = 
                 36.04 
                 31.71 
                 35.64 
               
               
                   
                 D6 = 
                 14.890 
                 5.867 
                 0.995 
               
               
                   
                 D11 = 
                 3.000 
                 8.107 
                 17.929 
               
               
                   
                 D13 = 
                 2.977 
                 2.563 
                 1.550 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 36 
               
             
             
               
                   
               
               
                 Lens Group Data of Zoom Lens System 
               
             
          
           
               
                 Lens Group 
                 First Surf. No. 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 1 
                 1 
                 −13.89 
               
               
                 2 
                 7 
                 9.90 
               
               
                 3 
                 12 
                 16.85 
               
               
                   
               
             
          
         
       
     
       Embodiment 10 
       [0186]      FIG. 37  shows the lens arrangement of the tenth embodiment of a zoom lens system according to the present invention.  FIGS. 38A through 38D  show aberrations of the lens arrangement shown in  FIG. 37  at the short focal length extremity when an object at infinity is in an in-focus state.  FIGS. 39A through 39D  show aberrations of the lens arrangement shown in  FIG. 37  at an intermediate focal length position when an object at infinity is in an in-focus state.  FIGS. 40A through 40D  show aberrations of the lens arrangement shown in  FIG. 37  at the long focal length extremity when an object at infinity is in an in-focus state. 
         [0187]    Table 37 shows the lens-surface data of the zoom lens system, Table 38 shows the aspherical-surface data, Table 39 shows the data on the variable values according to zooming, and Table 40 shows lens-group data. 
         [0188]    The basic lens arrangement of the tenth embodiment is the same as that of the first embodiment and only the numerical data shown in Tables 37 through 40 differ. 
         [0189]    The diaphragm S is provided at a position where the diaphragm S contacts surface No. 7, i.e., the front surface of the cemented lens (lens element  21 ) of the positive second lens group  20 . 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 37 
               
             
             
               
                   
               
               
                 Surface Data 
               
             
          
           
               
                 Surf. No. 
                 r 
                 d 
                 Nd 
                 ν 
               
               
                   
               
             
          
           
               
                 1 
                 37.028 
                 0.700 
                 1.71300 
                 53.9 
               
               
                 2 
                 6.443 
                 1.769 
               
               
                  3* 
                 11.672 
                 0.900 
                 1.54358 
                 55.7 
               
               
                  4* 
                 6.159 
                 0.486 
               
               
                  5* 
                 6.721 
                 2.200 
                 1.60641 
                 27.2 
               
               
                  6* 
                 16.211 
                 D6 
               
               
                 7 
                 4.886 
                 2.000 
                 1.88300 
                 40.8 
               
               
                 8 
                 −8.499 
                 0.500 
                 1.76182 
                 26.6 
               
               
                 9 
                 5.019 
                 0.711 
               
               
                 10* 
                 4.748 
                 1.100 
                 1.54358 
                 55.7 
               
               
                 11* 
                 5.509 
                 D11 
               
               
                 12* 
                 17.952 
                 1.800 
                 1.54358 
                 55.7 
               
               
                 13* 
                 −36.133 
                 D13 
               
               
                 14  
                 ∞ 
                 0.350 
                 1.51633 
                 64.1 
               
               
                 15  
                 ∞ 
                 0.510 
               
               
                 16  
                 ∞ 
                 0.500 
                 1.51633 
                 55.7 
               
               
                 17  
                 ∞ 
                 — 
               
               
                   
               
               
                 The symbol * designates the aspherical surface which is rotationally symmetrical with respect to the optical axis. 
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
             
           
               
                 TABLE 38 
               
               
                   
               
               
                 Aspherical surface data (the aspherical surface 
               
               
                 coefficients not indicated are zero (0.00)): 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surf. 
                   
                   
                   
               
               
                   
                 No. 
                 K 
                 A4 
                 A6 
               
               
                   
                   
               
               
                   
                 3 
                 0.000 
                 −0.3745 × 10 −3   
                  0.2216 × 10 −4   
               
               
                   
                 4 
                 0.000 
                 −0.1287 × 10 −2   
                  0.3475 × 10 −4   
               
               
                   
                 5 
                 0.000 
                 −0.6656 × 10 −3   
                  0.5393 × 10 −5   
               
               
                   
                 6 
                 0.000 
                 −0.2304 × 10 −3   
                 −0.6080 × 10 −5   
               
               
                   
                 10 
                 0.000 
                 −0.2577 × 10 −2   
                 −0.3048 × 10 −3   
               
               
                   
                 11 
                 0.000 
                  0.1295 × 10 −2   
                 −0.9968 × 10 −4   
               
               
                   
                 12 
                 0.000 
                  0.6674 × 10 −3   
                 −0.2151 × 10 −4   
               
               
                   
                 13 
                 0.000 
                  0.9647 × 10 −3   
                 −0.3374 × 10 −4   
               
               
                   
                   
               
             
          
           
               
                 Surf. 
                   
                   
               
               
                 No. 
                 A8 
                 A10 
               
               
                   
               
               
                 3 
                 −0.6238 × 10 −6   
                 0.5114 × 10 −8   
               
               
                 4 
                 −0.1393 × 10 −5   
                 0.0000 
               
               
                 5 
                 −0.5194 × 10 −6   
                 0.0000 
               
               
                 6 
                  0.0000 
                 0.0000 
               
               
                 10 
                 −0.4118 × 10 −4   
                 −0.1786 × 10 −6   
               
               
                 11 
                 −0.7221 × 10 −4   
                 0.6361 × 10 −5   
               
               
                 12 
                  0.9254 × 10 −6   
                 0.0000 
               
               
                 13 
                  0.1151 × 10 −5   
                 0.0000 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 39 
               
             
             
               
                   
               
               
                 Lens Data (Zoom Ratio = 3.88) 
               
             
          
           
               
                   
                 Short Focal 
                 Intermediate 
                 Long Focal 
               
               
                   
                 Length 
                 Focal Length 
                 Length 
               
               
                   
                 Extremity 
                 Position 
                 Extremity 
               
               
                   
                   
               
             
          
           
               
                   
                 FNO. = 
                 2.7 
                 3.7 
                 6.0 
               
               
                   
                 f = 
                 5.00 
                 9.62 
                 19.42 
               
               
                   
                 W = 
                 39.9 
                 22.9 
                 11.5 
               
               
                   
                 fB = 
                 0.59 
                 0.59 
                 0.59 
               
               
                   
                 L = 
                 36.55 
                 32.22 
                 36.63 
               
               
                   
                 D6 = 
                 14.875 
                 5.733 
                 0.992 
               
               
                   
                 D11 = 
                 2.871 
                 8.024 
                 18.706 
               
               
                   
                 D13 = 
                 3.292 
                 2.952 
                 1.413 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 40 
               
             
             
               
                   
               
               
                 Lens Group Data of Zoom Lens System 
               
             
          
           
               
                 Lens Group 
                 First Surf. No. 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 1 
                 1 
                 −13.10 
               
               
                 2 
                 7 
                 10.00 
               
               
                 3 
                 12 
                 22.33 
               
               
                   
               
             
          
         
       
     
       Embodiment 11 
       [0190]      FIG. 41  shows the lens arrangement of the eleventh embodiment of a zoom lens system according to the present invention.  FIGS. 42A through 42D  show aberrations of the lens arrangement shown in  FIG. 41  at the short focal length extremity when an object at infinity is in an in-focus state.  FIGS. 43A through 43D  show aberrations of the lens arrangement shown in  FIG. 41  at an intermediate focal length position when an object at infinity is in an in-focus state.  FIGS. 44A through 44D  show aberrations of the lens arrangement shown in  FIG. 41  at the long focal length extremity when an object at infinity is in an in-focus state. 
         [0191]    Table 41 shows the lens-surface data of the zoom lens system, Table 42 shows the aspherical-surf ace data, Table 43 shows the data on the variable values according to zooming, and Table 44 shows lens-group data. 
         [0192]    The basic lens arrangement of the tenth embodiment is the same as that of the first embodiment except that the negative lens element (the negative meniscus lens element)  11  of the negative first lens group  10  is a biconcave negative lens element  11 . 
         [0193]    The diaphragm S is provided at a position where the diaphragm S contacts surface No. 7, i.e., the front surface of the cemented lens (lens element  21 ) of the positive second lens group  20 . 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 41 
               
             
             
               
                   
               
               
                 Surface Data 
               
             
          
           
               
                 Surf. No. 
                 r 
                 d 
                 Nd 
                 ν 
               
               
                   
               
             
          
           
               
                 1 
                 −170.949 
                 0.700 
                 1.64000 
                 60.2 
               
               
                 2 
                 10.784 
                 0.444 
               
               
                  3* 
                 13.915 
                 0.900 
                 1.54358 
                 55.7 
               
               
                  4* 
                 6.051 
                 1.306 
               
               
                  5* 
                 7.057 
                 2.200 
                 1.60641 
                 27.2 
               
               
                  6* 
                 13.480 
                 D6 
               
               
                 7 
                 4.797 
                 2.000 
                 1.88300 
                 40.8 
               
               
                 8 
                 −7.325 
                 0.500 
                 1.74077 
                 27.8 
               
               
                 9 
                 4.297 
                 0.164 
               
               
                 10* 
                 4.149 
                 1.100 
                 1.54358 
                 55.7 
               
               
                 11* 
                 4.788 
                 D11 
               
               
                 12* 
                 23.259 
                 1.800 
                 1.54358 
                 55.7 
               
               
                 13* 
                 −11.921 
                 D13 
               
               
                 14  
                 ∞ 
                 0.350 
                 1.51633 
                 64.1 
               
               
                 15  
                 ∞ 
                 0.510 
               
               
                 16  
                 ∞ 
                 0.500 
                 1.51633 
                 55.7 
               
               
                 17  
                 ∞ 
                 — 
               
               
                   
               
               
                 The symbol * designates the aspherical surface which is rotationally symmetrical with respect to the optical axis. 
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
             
           
               
                 TABLE 42 
               
               
                   
               
               
                 Aspherical surface data (the aspherical surface 
               
               
                 coefficients not indicated are zero (0.00)): 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surf. 
                   
                   
                   
               
               
                   
                 No. 
                 K 
                 A4 
                 A6 
               
               
                   
                   
               
               
                   
                 3 
                 0.000 
                 0.9963 × 10 −3   
                 −0.2554 × 10 −4   
               
               
                   
                 4 
                 0.000 
                 0.3428 × 10 −3   
                  0.2967 × 10 −4   
               
               
                   
                 5 
                 0.000 
                 −0.8426 × 10 −3   
                  0.4634 × 10 −4   
               
               
                   
                 6 
                 0.000 
                 −0.6056 × 10 −3   
                  0.2143 × 10 −4   
               
               
                   
                 10 
                 0.000 
                 −0.2354 × 10 −2   
                 −0.2696 × 10 −3   
               
               
                   
                 11 
                 0.000 
                 0.2210 × 10 −2   
                  0.7862 × 10 −4   
               
               
                   
                 12 
                 0.000 
                 0.5234 × 10 −3   
                 −0.2642 × 10 −4   
               
               
                   
                 13 
                 0.000 
                 0.1135 × 10 −2   
                 −0.4950 × 10 −4   
               
               
                   
                   
               
             
          
           
               
                 Surf. 
                   
                   
               
               
                 No. 
                 A8 
                 A10 
               
               
                   
               
               
                 3 
                  0.3308 × 10 −6   
                 −0.3143 × 10 −8   
               
               
                 4 
                 −0.1584 × 10 −5   
                 0.0000 
               
               
                 5 
                 −0.1317 × 10 −5   
                 0.2016 × 10 −8   
               
               
                 6 
                 −0.6433 × 10 −6   
                 0.0000 
               
               
                 10 
                 −0.4764 × 10 −4   
                 −0.2013 × 10 −5   
               
               
                 11 
                 −0.1067 × 10 −3   
                 0.8766 × 10 −5   
               
               
                 12 
                  0.1165 × 10 −5   
                 0.0000 
               
               
                 13 
                  0.1635 × 10 −5   
                 0.0000 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 43 
               
             
             
               
                   
               
               
                 Lens Data (Zoom Ratio = 3.88) 
               
             
          
           
               
                   
                 Short Focal 
                 Intermediate 
                 Long Focal 
               
               
                   
                 Length 
                 Focal Length 
                 Length 
               
               
                   
                 Extremity 
                 Position 
                 Extremity 
               
               
                   
                   
               
             
          
           
               
                   
                 FNO. = 
                 2.7 
                 3.7 
                 5.9 
               
               
                   
                 f = 
                 5.00 
                 9.62 
                 19.42 
               
               
                   
                 W = 
                 39.6 
                 22.5 
                 11.4 
               
               
                   
                 fB = 
                 0.59 
                 0.59 
                 0.59 
               
               
                   
                 L = 
                 36.52 
                 31.95 
                 36.12 
               
               
                   
                 D6 = 
                 15.630 
                 6.209 
                 1.000 
               
               
                   
                 D11 = 
                 3.741 
                 8.911 
                 18.857 
               
               
                   
                 D13 = 
                 2.688 
                 2.364 
                 1.796 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 44 
               
             
             
               
                   
               
               
                 Lens Group Data of Zoom Lens System 
               
             
          
           
               
                 Lens Group 
                 First Surf. No. 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 1 
                 1 
                 −14.58 
               
               
                 2 
                 7 
                 10.28 
               
               
                 3 
                 12 
                 14.76 
               
               
                   
               
             
          
         
       
     
       Embodiment 12 
       [0194]      FIG. 45  shows the lens arrangement of the twelfth embodiment of a zoom lens system according to the present invention.  FIGS. 46A through 46D  show aberrations of the lens arrangement shown in  FIG. 45  at the short focal length extremity when an object at infinity is in an in-focus state.  FIGS. 47A through 47D  show aberrations of the lens arrangement shown in  FIG. 45  at an intermediate focal length position when an object at infinity is in an in-focus state.  FIGS. 48A through 48D  show aberrations of the lens arrangement shown in  FIG. 45  at the long focal length extremity when an object at infinity is in an in-focus state. 
         [0195]    Table 45 shows the lens-surface data of the zoom lens system, Table 46 shows the aspherical-surface data, Table 47 shows the data on the variable values according to zooming, and Table 48 shows lens-group data. 
         [0196]    The basic lens arrangement of the tenth embodiment is the same as that of the first embodiment except that the meniscus lens element  24 , of the positive second lens group  20 , has a negative refractive power. 
         [0197]    The diaphragm S is provided at a position where the diaphragm S contacts surface No. 7, i.e., the front surface of the cemented lens (lens element  21 ) of the positive second lens group  20 . 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 45 
               
             
             
               
                   
               
               
                 Surface Data 
               
             
          
           
               
                 Surf. No. 
                 r 
                 d 
                 Nd 
                 ν 
               
               
                   
               
             
          
           
               
                 1 
                 29.371 
                 0.700 
                 1.61800 
                 63.4 
               
               
                 2 
                 5.852 
                 1.800 
               
               
                  3* 
                 12.000 
                 1.000 
                 1.54358 
                 55.7 
               
               
                  4* 
                 7.453 
                 0.460 
               
               
                  5* 
                 6.077 
                 2.000 
                 1.60641 
                 27.2 
               
               
                  6* 
                 8.929 
                 D6 
               
               
                 7 
                 5.359 
                 1.900 
                 1.88300 
                 40.8 
               
               
                 8 
                 −9.497 
                 0.500 
                 1.84666 
                 23.8 
               
               
                 9 
                 22.152 
                 0.400 
               
               
                 10* 
                 200.000 
                 0.900 
                 1.60641 
                 27.2 
               
               
                 11* 
                 10.633 
                 D11 
               
               
                 12* 
                 49.550 
                 1.800 
                 1.54358 
                 55.7 
               
               
                 13* 
                 −14.133 
                 D13 
               
               
                 14  
                 ∞ 
                 0.350 
                 1.51633 
                 64.1 
               
               
                 15  
                 ∞ 
                 0.510 
               
               
                 16  
                 ∞ 
                 0.500 
                 1.51633 
                 55.7 
               
               
                 17  
                 ∞ 
                 — 
               
               
                   
               
               
                 The symbol * designates the aspherical surface which is rotationally symmetrical with respect to the optical axis. 
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 46 
               
             
             
               
                   
               
               
                 Aspherical surface data (the aspherical surface 
               
               
                 coefficients not indicated are zero (0.00)): 
               
             
          
           
               
                 Surf. 
                   
                   
                   
                   
               
               
                 No. 
                 K 
                 A4 
                 A6 
                 A8 
               
               
                   
               
             
          
           
               
                 3 
                 0.000 
                 0.1316 × 10 −2   
                 −0.3179 × 10 −4   
                  0.3822 × 10 −6   
               
               
                 4 
                 0.000 
                 0.1163 × 10 −2   
                  0.4664 × 10 −5   
                 −0.9154 × 10 −6   
               
               
                 5 
                 0.000 
                 −0.8606 × 10 −3   
                  0.3269 × 10 −4   
                 −0.1394 × 10 −5   
               
               
                 6 
                 0.000 
                 −0.9417 × 10 −3   
                  0.6230 × 10 −5   
                 −0.4551 × 10 −6   
               
               
                 10 
                 0.000 
                 0.3269 × 10 −2   
                 −0.3587 × 10 −4   
                 −0.1852 × 10 −4   
               
               
                 11 
                 0.000 
                 0.6755 × 10 −2   
                  0.2505 × 10 −3   
                 −0.1878 × 10 −4   
               
               
                 12 
                 0.000 
                 0.5430 × 10 −4   
                 −0.1411 × 10 −4   
                 −0.6304 × 10 −6   
               
               
                 13 
                 0.000 
                 0.3553 × 10 −3   
                 −0.3169 × 10 −4   
                 −0.1580 × 10 −6   
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 47 
               
             
             
               
                   
               
               
                 Lens Data (Zoom Ratio = 3.88) 
               
             
          
           
               
                   
                 Short Focal 
                 Intermediate 
                 Long Focal 
               
               
                   
                 Length 
                 Focal Length 
                 Length 
               
               
                   
                 Extremity 
                 Position 
                 Extremity 
               
               
                   
                   
               
             
          
           
               
                   
                 FNO. = 
                 2.7 
                 3.6 
                 5.8 
               
               
                   
                 f = 
                 5.00 
                 9.62 
                 19.41 
               
               
                   
                 W = 
                 40.1 
                 23.0 
                 11.6 
               
               
                   
                 fB = 
                 0.59 
                 0.59 
                 0.59 
               
               
                   
                 L = 
                 36.57 
                 31.95 
                 36.50 
               
               
                   
                 D6 = 
                 14.821 
                 5.621 
                 1.072 
               
               
                   
                 D11 = 
                 3.911 
                 8.410 
                 18.818 
               
               
                   
                 D13 = 
                 3.023 
                 3.112 
                 1.800 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
             
           
               
                 TABLE 48 
               
             
             
               
                   
               
               
                 Lens Group Data of Zoom Lens System 
               
             
          
           
               
                 Lens Group 
                 First Surf. No. 
                 Focal Length 
               
               
                   
               
             
          
           
               
                 1 
                 1 
                 −12.90 
               
               
                 2 
                 7 
                 9.74 
               
               
                 3 
                 12 
                 20.43 
               
               
                   
               
             
          
         
       
     
         [0198]    The numerical values of each condition for each embodiment are shown in Table 33. 
         [0000]    
       
         
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
             
           
               
                   
                 TABLE 49 
               
               
                   
                   
               
               
                   
                 Cond. 
                 Cond. 
                 Cond. 
                 Cond. 
                 Cond. 
                 Cond. 
               
               
                   
                 (1) 
                 (2) 
                 (3) 
                 (4) 
                 (5) 
                 (6) 
               
               
                   
                   
               
             
             
               
                   
               
             
          
           
               
                 Embod. 1 
                 0.214 
                 0.892 
                 0.479 
                 0.059 
                 1.117 
                 0.426 
               
               
                 Embod. 2 
                 0.289 
                 0.891 
                 0.083 
                 0.007 
                 1.132 
                 — 
               
               
                 Embod. 3 
                 0.213 
                 0.870 
                 0.691 
                 0.029 
                 1.117 
                 0.296 
               
               
                 Embod. 4 
                 0.215 
                 0.878 
                 1.195 
                 0.018 
                 1.107 
                 0.054 
               
               
                 Embod. 5 
                 0.172 
                 0.884 
                 0.429 
                 0.057 
                 1.100 
                 0.429 
               
               
                 Embod. 6 
                 0.498 
                 0.825 
                 0.937 
                 0.032 
                 1.103 
                 0.240 
               
               
                 Embod. 7 
                 −0.388 
                 1.106 
                 0.219 
                 −0.047 
                 1.125 
                 0.244 
               
               
                 Embod. 8 
                 0.206 
                 0.876 
                 0.458 
                 0.069 
                 1.113 
                 0.434 
               
               
                 Embod. 9 
                 0.272 
                 0.868 
                 0.302 
                 −0.136 
                 1.120 
                 — 
               
               
                 Embod. 10 
                 0.306 
                 1.150 
                 0.434 
                 0.044 
                 1.113 
                 0.444 
               
               
                 Embod. 11 
                 0.396 
                 0.760 
                 0.771 
                 0.077 
                 1.089 
                 0.236 
               
               
                 Embod. 12 
                 −0.391 
                 1.053 
                 0.305 
                 −0.102 
                 1.079 
                 0.371 
               
               
                   
               
             
          
         
       
     
         [0199]    As can be understood from Table 49, all the embodiments except the sixth embodiment satisfy both condition (1) and condition (2); and, condition (6) is not calculated with respect to the second and ninth embodiments, since the lens arrangements of these embodiments are different from those of other embodiments. Furthermore, as can be understood from the aberration diagrams, the various aberrations are suitably corrected. 
         [0200]    Obvious changes may be made in the specific embodiments of the present invention described herein, such modifications being within the spirit and scope of the invention claimed. It is indicated that all matter contained herein is illustrative and does not limit the scope of the present invention.