Abstract:
A zoom lens system includes a first lens unit having positive optical power, a second lens unit having negative optical power, a third lens unit having positive optical power, a fourth lens unit having negative optical power, and a fifth lens unit having positive optical power. A condition of 18.5&lt;f G1 /f W &lt;30.0 (f G1 : a focal length of the first lens unit, f W : a focal length of the entire system at the wide-angle limit) and a condition of 1.1&lt;m 5T /m 5W &lt;2.0 (m 5T  is a lateral magnification of the fifth lens unit at the telephoto limit, and m 5W  is a lateral magnification of the fifth lens unit at the wide-angle limit) are satisfied.

Description:
RELATED APPLICATIONS 
       [0001]    This application is a Continuation of U.S. patent application Ser. No. 14/986,864, filed on Jan. 4, 2016, which is a Continuation of International Application No. PCT/JP2013/005792, filed on Sep. 27, 2013, which in turn claims the benefit of Japanese Application No. 2013-146134, filed on Jul. 12, 2013, the disclosures of which applications are incorporated by reference herein. 
     
    
     BACKGROUND 
       [0002]    1. Field 
         [0003]    The present disclosure relates to zoom lens systems, imaging devices, and cameras. 
         [0004]    2. Description of the Related Art 
         [0005]    Size reduction and performance improvement are strongly required of cameras having image sensors performing photoelectric conversion, such as digital still cameras, digital video cameras, and the like (simply referred to as digital cameras, hereinafter). 
         [0006]    Japanese Laid-Open Patent Publication No. 10-333038 discloses a zoom lens system having a six-unit configuration of positive, negative, positive, positive, negative, and positive, and performing zooming by changing the interval between the respective lens units. 
         [0007]    Japanese Patent No. 4891439, Japanese Patent No. 4891440, and Japanese Patent No. 4891441 discloses a zoom lens system having a two-unit configuration of positive and negative, in which, in zooming, the first lens unit moves with reciprocated locus being convex to the image side. 
       SUMMARY 
       [0008]    The present disclosure provides a compact zoom lens system having excellent optical performance over the entire zoom range while having a high magnification ratio. Further the present disclosure provides an imaging device including the zoom lens system, and a thin and compact camera including the imaging device. 
         [0009]    A zoom lens system according to the present disclosure, in order from an object side to an image side, includes: 
         [0010]    a first lens unit having positive optical power; 
         [0011]    a second lens unit having negative optical power; 
         [0012]    a third lens unit having positive optical power; 
         [0013]    a fourth lens unit having negative optical power; and 
         [0014]    a fifth lens unit having positive optical power, wherein 
         [0015]    in zooming from a wide-angle limit to a telephoto limit at the time of image taking, at least the first lens unit, the second lens unit, and the third lens unit move along an optical axis so that an interval between the first lens unit and the second lens unit at the telephoto limit becomes larger than that at the wide-angle limit, and an interval between the second lens unit and the third lens unit at the telephoto limit becomes narrower than that at the wide-angle limit, 
         [0016]    an aperture diaphragm is disposed between the second lens unit and the third lens unit, and 
         [0017]    the following conditions (1) and (3) are satisfied: 
         [0000]      18.5&lt; f   G1   /f   W &lt;30.0  (1)
 
         [0000]      1.1&lt; m   5T   /m   5W &lt;2.0  (3)
 
         [0018]    where 
         [0019]    f G1  is a focal length of the first lens unit, 
         [0020]    f W  is a focal length of the entire system at the wide-angle limit, 
         [0021]    m 5T  is a lateral magnification of the fifth lens unit at the telephoto limit, and 
         [0022]    m 5W  is a lateral magnification of the fifth lens unit at the wide-angle limit. 
         [0023]    An imaging device according to the present disclosure is an imaging device capable of outputting an optical image of an object as an electric image signal, and including: 
         [0024]    a zoom lens system that forms an optical image of the object; and 
         [0025]    an image sensor that converts the optical image formed by the zoom lens system into the electric image signal, wherein 
         [0026]    the zoom lens system is a zoom lens system, in order from an object side to an image side, including: 
         [0027]    a first lens unit having positive optical power; 
         [0028]    a second lens unit having negative optical power; 
         [0029]    a third lens unit having positive optical power; 
         [0030]    a fourth lens unit having optical power; and 
         [0031]    a fifth lens unit having optical power, wherein 
         [0032]    in zooming from a wide-angle limit to a telephoto limit at the time of image taking, at least the first lens unit, the second lens unit, and the third lens unit move along an optical axis so that an interval between the first lens unit and the second lens unit at the telephoto limit becomes larger than that at the wide-angle limit, and an interval between the second lens unit and the third lens unit at the telephoto limit becomes narrower than that at the wide-angle limit, 
         [0033]    an aperture diaphragm is disposed between the second lens unit and the third lens unit, and 
         [0034]    the following conditions (1) and (3) are satisfied: 
         [0000]      18.5&lt; f   G1   /f   W &lt;30.0  (1)
 
         [0000]      1.1&lt; m   5T   /m   5W &lt;2.0  (3)
 
         [0035]    where 
         [0036]    f G1  is a focal length of the first lens unit, 
         [0037]    f W  is a focal length of the entire system at the wide-angle limit, 
         [0038]    m 5T  is a lateral magnification of the fifth lens unit at the telephoto limit, and 
         [0039]    m 5W  is a lateral magnification of the fifth lens unit at the wide-angle limit. 
         [0040]    A camera according to the present disclosure is a camera for converting an optical image of an object into an electric image signal and then performing at least one of displaying and storing of the converted image signal, and including: 
         [0041]    an imaging device including a zoom lens system that forms the optical image of the object, and an image sensor that converts the optical image formed by the zoom lens system into the electric image signal, wherein the zoom lens system is a zoom lens system including: 
         [0042]    a first lens unit having positive optical power; 
         [0043]    a second lens unit having negative optical power; 
         [0044]    a third lens unit having positive optical power; 
         [0045]    a fourth lens unit having optical power; and 
         [0046]    a fifth lens unit having optical power, wherein 
         [0047]    in zooming from a wide-angle limit to a telephoto limit at the time of image taking, at least the first lens unit, the second lens unit, and the third lens unit move along an optical axis so that an interval between the first lens unit and the second lens unit at the telephoto limit becomes larger than that at the wide-angle limit, and an interval between the second lens unit and the third lens unit at the telephoto limit becomes narrower than that at the wide-angle limit, 
         [0048]    an aperture diaphragm is disposed between the second lens unit and the third lens unit, and 
         [0049]    the following conditions (1) and (3) are satisfied: 
         [0000]      18.5&lt; f   G1   /f   W &lt;30.0  (1)
 
         [0000]      1.1&lt; m   5T   /m   5W &lt;2.0  (3)
 
         [0050]    where 
         [0051]    f G1  is a focal length of the first lens unit, 
         [0052]    f W  is a focal length of the entire system at the wide-angle limit, 
         [0053]    m 5T  is a lateral magnification of the fifth lens unit at the telephoto limit, and 
         [0054]    m 5W  is a lateral magnification of the fifth lens unit at the wide-angle limit. 
         [0055]    The zoom lens system according to the present disclosure is compact and has excellent optical performance over the entire zoom range while having a high magnification ratio. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0056]      FIG. 1  is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment 1 (Numerical Example 1); 
           [0057]      FIG. 2  is a longitudinal aberration diagram of an infinity in-focus condition of the zoom lens system according to Numerical Example 1; 
           [0058]      FIG. 3  is a lateral aberration diagram in a basic state where image blur compensation is not performed and in an image blur compensation state at a telephoto limit of the zoom lens system according to Numerical Example 1; 
           [0059]      FIG. 4  is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment 2 (Numerical Example 2); 
           [0060]      FIG. 5  is a longitudinal aberration diagram showing an infinity in-focus condition of the zoom lens system according to Numerical Example 2; 
           [0061]      FIG. 6  is a lateral aberration diagram in a basic state where image blur compensation is not performed and in an image blur compensation state at a telephoto limit of the zoom lens system according to Numerical Example 2; 
           [0062]      FIG. 7  is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment 3 (Numerical Example 3); 
           [0063]      FIG. 8  is a longitudinal aberration diagram showing an infinity in-focus condition of the zoom lens system according to Numerical Example 3; 
           [0064]      FIG. 9  is a lateral aberration diagram in a basic state where image blur compensation is not performed and in an image blur compensation state at a telephoto limit of the zoom lens system according to Numerical Example 3; 
           [0065]      FIG. 10  is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment 4 (Numerical Example 4); 
           [0066]      FIG. 11  is a longitudinal aberration diagram showing an infinity in-focus condition of the zoom lens system according to Numerical Example 4; 
           [0067]      FIG. 12  is a lateral aberration diagram in a basic state where image blur compensation is not performed and in an image blur compensation state at a telephoto limit of the zoom lens system according to Numerical Example 4; 
           [0068]      FIG. 13  is a lens arrangement diagram showing an infinity in-focus condition of a zoom lens system according to Embodiment 5 (Numerical Example 5); 
           [0069]      FIG. 14  is a longitudinal aberration diagram showing an infinity in-focus condition of the zoom lens system according to Numerical Example 5; 
           [0070]      FIG. 15  is a lateral aberration diagram in a basic state where image blur compensation is not performed and in an image blur compensation state at a telephoto limit of the zoom lens system according to Numerical Example 5; and 
           [0071]      FIG. 16  is a schematic block diagram of a digital still camera according to Embodiment 6. 
       
    
    
     DETAILED DESCRIPTION 
       [0072]    Hereinafter, embodiments will be described with reference to the drawings as appropriate. However, descriptions more detailed than necessary may be omitted. For example, detailed description of already well known matters or description of substantially identical configurations may be omitted. This is intended to avoid redundancy in the description below, and to facilitate understanding of those skilled in the art. 
         [0073]    It should be noted that the applicants provide the attached drawings and the following description so that those skilled in the art can fully understand this disclosure. Therefore, the drawings and description are not intended to limit the subject defined by the claims. 
       Embodiments 1 to 5 
       [0074]      FIGS. 1, 4, 7, 10 and 13  are lens arrangement diagrams of zoom lens systems according to Embodiments 1 to 5, respectively. Each zoom lens system is in an infinity in-focus condition. 
         [0075]    In each Fig., part (a) shows a lens configuration at a wide-angle limit (in the minimum focal length condition: focal length f w ), part (b) shows a lens configuration at a middle position (in an intermediate focal length condition: focal length f M =√(f w *f T )), and part (c) shows a lens configuration at a telephoto limit (in the maximum focal length condition: focal length f T ). Further, in each Fig., each bent arrow located between part (a) and part (b) indicates a line obtained by connecting the positions of each lens unit respectively at a wide-angle limit, a middle position and a telephoto limit, in order from the top. In the part between the wide-angle limit and the middle position and the part between the middle position and the telephoto limit, the positions are connected simply with a straight line, and hence this line does not indicate actual motion of each lens unit. 
         [0076]    In each Fig., an arrow imparted to a lens unit indicates focusing from an infinity in-focus condition to a close-object in-focus condition. That is, in  FIGS. 1, 4, 7, 10 and 13 , the arrow indicates a direction along which a fourth lens unit G 4  described later moves in focusing from the infinity in-focus condition to the close-object in-focus condition. In  FIGS. 1, 4, 7, 10 and 13 , since the symbols of the respective lens units are imparted to part (a), the arrow indicating focusing is placed beneath each symbol of each lens unit for the convenience sake. However, the direction along which each lens unit moves in focusing in each zooming condition will be hereinafter described in detail for each embodiment. 
         [0077]    In  FIGS. 1, 4, 7, 10 and 13 , an asterisk “*” imparted to a particular surface indicates that the surface is aspheric. In each Fig., symbol (+) or (−) imparted to the symbol of each lens unit corresponds to the sign of the optical power of the lens unit. In each Fig., a straight line located on the most right-hand side indicates the position of the image surface S. On the object side relative to the image surface S (between the image surface S and the most image side lens surface of a sixth lens unit G 6  in Embodiments 1 to 3, and between the image surface S and the most image side lens surface of a fifth lens unit G 5  in Embodiments 4 and 5), a parallel plate P equivalent to an optical low-pass filter or a face plate of an image sensor is provided. 
         [0078]    Further, as shown in  FIGS. 1, 4, 7, 10 and 13 , an aperture diaphragm A is provided between a second lens unit G 2  and a third lens unit G 3 . The aperture diaphragm A moves along the optical axis together with the third lens unit G 3  in zooming from the wide-angle limit to the telephoto limit at the time of image taking. 
       1. Embodiment 1 
     FIG.  1   
       [0079]    As shown in  FIG. 1 , the zoom lens system according to Embodiment 1, in order from the object side to the image side, comprises a first lens unit G 1  having positive optical power, a second lens unit G 2  having negative optical power, a third lens unit G 3  having positive optical power, a fourth lens unit G 4  having positive optical power, a fifth lens unit G 5  having negative optical power, and a sixth lens unit G 6  having positive optical power. In the zoom lens system according to Embodiment 1, since the respective lens units are arranged in the above optical power allocation, size reduction of the entire lens system is achieved while maintaining excellent optical performance. 
         [0080]    The first lens unit G 1 , in order from the object side to the image side, comprises: a negative meniscus first lens element L 1  with the convex surface facing the object side; a bi-convex second lens element L 2 ; and a positive meniscus third lens element L 3  with the convex surface facing the object side. Among these, the first lens element L 1  and the second lens element L 2  are cemented with each other. In the surface data of the corresponding Numerical Example described later, a surface number  2  is imparted to an adhesive layer between the first lens element L 1  and the second lens element L 2 . 
         [0081]    The second lens unit G 2 , in order from the object side to the image side, comprises: a negative meniscus fourth lens element L 4  with the convex surface facing the object side; a bi-concave fifth lens element L 5 ; and a positive meniscus sixth lens element L 6  with the convex surface facing the object side. The fifth lens element L 5  has two aspheric surfaces. 
         [0082]    The third lens unit G 3 , in order from the object side to the image side, comprises: a bi-convex seventh lens element L 7 ; a bi-convex eighth lens element L 8 ; a bi-concave ninth lens element L 9 ; and a positive meniscus tenth lens element L 10  with the convex surface facing the image side. Among these, the eighth lens element L 8  and the ninth lens element L 9  are cemented with each other. In the surface data of the corresponding Numerical Example described later, a surface number  17  is imparted to an adhesive layer between the eighth lens element L 8  and the ninth lens element L 9 . The seventh lens element L 7  has two aspheric surfaces. 
         [0083]    The fourth lens unit G 4 , in order from the object side to the image side, comprises: a negative meniscus eleventh lens element L 11  with the convex surface facing the image side; and a bi-convex twelfth lens element L 12 . The eleventh lens element L 11  has an aspheric object-side surface. The twelfth lens element L 12  has an aspheric image-side surface. 
         [0084]    The fifth lens unit G 5  comprises solely a bi-concave thirteenth lens element L 13 . The thirteenth lens element L 13  has an aspheric object-side surface. 
         [0085]    The sixth lens unit G 6  comprises solely a positive meniscus fourteenth lens element L 14  with the convex surface facing the image side. The fourteenth lens element L 14  has two aspheric surfaces. 
         [0086]    An aperture diaphragm A is disposed between the second lens unit G 2  and the third lens unit G 3 . 
         [0087]    In the zoom lens system according to Embodiment 1, the entirety of the third lens unit G 3  corresponds to an image blur compensation lens unit described later which moves in a direction perpendicular to the optical axis to optically compensate for image blur. 
         [0088]    In the zoom lens system according to Embodiment 1, in zooming from the wide-angle limit to the telephoto limit at the time of image taking, the first lens unit G 1 , the fourth lens unit G 4 , and the fifth lens unit G 5  move to the object side, the second lens unit G 2  moves with locus of a convex to the image side, the third lens unit G 3  monotonically moves to the object side, and the sixth lens unit G 6  moves to the image side. That is, in zooming, the first lens unit G 1 , the second lens unit G 2 , the third lens unit G 3 , the fourth lens unit G 4 , the fifth lens unit G 5 , and the sixth lens unit G 6  individually move along the optical axis so that the interval between the first lens unit G 1  and the second lens unit G 2 , the interval between the third lens unit G 3  and the fourth lens unit G 4 , and the interval between the fifth lens unit G 5  and the sixth lens unit G 6  increase, and the interval between the second lens unit G 2  and the third lens unit G 3  and the interval between the fourth lens unit G 4  and the fifth lens unit G 5  decrease. 
         [0089]    In the zoom lens system according to Embodiment 1, in focusing from the infinity in-focus condition to the close-object in-focus condition, the fourth lens unit G 4  as a focusing lens unit moves to the object side along the optical axis in any zooming condition. 
         [0090]    The focusing lens unit may be the fifth lens unit G 5  or the sixth lens unit G 6 . 
       2. Embodiment 2 
     FIG.  4   
       [0091]    As shown in  FIG. 4 , the zoom lens system according to Embodiment 2, in order from the object side to the image side, comprises a first lens unit G 1  having positive optical power, a second lens unit G 2  having negative optical power, a third lens unit G 3  having positive optical power, a fourth lens unit G 4  having positive optical power, a fifth lens unit G 5  having negative optical power, and a sixth lens unit G 6  having positive optical power. In the zoom lens system according to Embodiment 2, since the respective lens units are arranged in the above optical power allocation, size reduction of the entire lens system is achieved while maintaining excellent optical performance. 
         [0092]    The first lens unit G 1 , in order from the object side to the image side, comprises: a negative meniscus first lens element L 1  with the convex surface facing the object side; a bi-convex second lens element L 2 ; and a positive meniscus third lens element L 3  with the convex surface facing the object side. Among these, the first lens element L 1  and the second lens element L 2  are cemented with each other. In the surface data of the corresponding Numerical Example described later, a surface number  2  is imparted to an adhesive layer between the first lens element L 1  and the second lens element L 2 . 
         [0093]    The second lens unit G 2 , in order from the object side to the image side, comprises: a negative meniscus fourth lens element L 4  with the convex surface facing the object side; a bi-concave fifth lens element L 5 ; and a bi-convex sixth lens element L 6 . The fifth lens element L 5  has two aspheric surfaces. 
         [0094]    The third lens unit G 3 , in order from the object side to the image side, comprises: a positive meniscus seventh lens element L 7  with the convex surface facing the object side; a bi-convex eighth lens element L 8 ; a bi-concave ninth lens element L 9 ; and a bi-convex tenth lens element L 10 . Among these, the eighth lens element L 8  and the ninth lens element L 9  are cemented with each other. In the surface data of the corresponding Numerical Example described later, a surface number  17  is imparted to an adhesive layer between the eighth lens element L 8  and the ninth lens element L 9 . The eighth lens element L 8  has an aspheric object-side surface. 
         [0095]    The fourth lens unit G 4  comprises solely a positive meniscus eleventh lens element L 11  with the convex surface facing the object side. 
         [0096]    The fifth lens unit G 5  comprises solely a bi-concave twelfth lens element L 12 . 
         [0097]    The sixth lens unit G 6  comprises solely a bi-convex thirteenth lens element L 13 . The thirteenth lens element L 13  has two aspheric surfaces. 
         [0098]    An aperture diaphragm A is disposed between the second lens unit G 2  and the third lens unit G 3 . 
         [0099]    In the zoom lens system according to Embodiment 2, the entirety of the third lens unit G 3  corresponds to an image blur compensation lens unit described later which moves in a direction perpendicular to the optical axis to optically compensate for image blur. 
         [0100]    In the zoom lens system according to Embodiment 2, in zooming from the wide-angle limit to the telephoto limit at the time of image taking, the first lens unit G 1 , the fourth lens unit G 4 , and the fifth lens unit G 5  move to the object side, the second lens unit G 2  moves with locus of a convex to the image side, the third lens unit G 3  monotonically moves to the object side, and the sixth lens unit G 6  moves to the image side. That is, in zooming, the first lens unit G 1 , the second lens unit G 2 , the third lens unit G 3 , the fourth lens unit G 4 , the fifth lens unit G 5 , and the sixth lens unit G 6  individually move along the optical axis so that the interval between the first lens unit G 1  and the second lens unit G 2 , the interval between the third lens unit G 3  and the fourth lens unit G 4 , the interval between the fourth lens unit G 4  and the fifth lens unit G 5 , and the interval between the fifth lens unit G 5  and the sixth lens unit G 6  increase, and the interval between the second lens unit G 2  and the third lens unit G 3  decreases. 
         [0101]    In the zoom lens system according to Embodiment 2, in focusing from the infinity in-focus condition to the close-object in-focus condition, the fourth lens unit G 4  as a focusing lens unit moves to the object side along the optical axis in any zooming condition. 
         [0102]    The focusing lens unit may be the fifth lens unit G 5  or the sixth lens unit G 6 . 
       3. Embodiment 3 
     FIG.  7   
       [0103]    As shown in  FIG. 7 , the zoom lens system according to Embodiment 3, in order from the object side to the image side, comprises a first lens unit G 1  having positive optical power, a second lens unit G 2  having negative optical power, a third lens unit G 3  having positive optical power, a fourth lens unit G 4  having negative optical power, a fifth lens unit G 5  having negative optical power, and a sixth lens unit G 6  having positive optical power. In the zoom lens system according to Embodiment 3, since the respective lens units are arranged in the above optical power allocation, size reduction of the entire lens system is achieved while maintaining excellent optical performance. 
         [0104]    The first lens unit G 1 , in order from the object side to the image side, comprises: a negative meniscus first lens element L 1  with the convex surface facing the object side; a bi-convex second lens element L 2 ; and a positive meniscus third lens element L 3  with the convex surface facing the object side. Among these, the first lens element L 1  and the second lens element L 2  are cemented with each other. In the surface data of the corresponding Numerical Example described later, a surface number  2  is imparted to an adhesive layer between the first lens element L 1  and the second lens element L 2 . 
         [0105]    The second lens unit G 2 , in order from the object side to the image side, comprises: a negative meniscus fourth lens element L 4  with the convex surface facing the object side; a bi-concave fifth lens element L 5 ; and a bi-convex sixth lens element L 6 . The fifth lens element L 5  has two aspheric surfaces. 
         [0106]    The third lens unit G 3 , in order from the object side to the image side, comprises: a bi-convex seventh lens element L 7 ; a bi-convex eighth lens element L 8 ; a bi-concave ninth lens element L 9 ; and a bi-convex tenth lens element L 10 . Among these, the eighth lens element L 8  and the ninth lens element L 9  are cemented with each other. In the surface data of the corresponding Numerical Example described later, a surface number  17  is imparted to an adhesive layer between the eighth lens element L 8  and the ninth lens element L 9 . The seventh lens element L 7  has two aspheric surfaces. 
         [0107]    The fourth lens unit G 4  comprises solely a negative meniscus eleventh lens element L 11  with the convex surface facing the object side. 
         [0108]    The fifth lens unit G 5  comprises solely a negative meniscus twelfth lens element L 12  with the convex surface facing the image side. 
         [0109]    The sixth lens unit G 6  comprises solely a bi-convex thirteenth lens element L 13 . The thirteenth lens element L 13  has two aspheric surfaces. 
         [0110]    An aperture diaphragm A is disposed between the second lens unit G 2  and the third lens unit G 3 . 
         [0111]    In the zoom lens system according to Embodiment 3, the entirety of the third lens unit G 3  corresponds to an image blur compensation lens unit described later which moves in a direction perpendicular to the optical axis to optically compensate for image blur. 
         [0112]    In the zoom lens system according to Embodiment 3, in zooming from the wide-angle limit to the telephoto limit at the time of image taking, the first lens unit G 1  moves to the object side, the second lens unit G 2 , the fourth lens unit G 4 , and the fifth lens unit G 5  move with locus of a convex to the image side, the third lens unit G 3  monotonically moves to the object side, and the sixth lens unit G 6  moves to the image side. That is, in zooming, the first lens unit G 1 , the second lens unit G 2 , the third lens unit G 3 , the fourth lens unit G 4 , the fifth lens unit G 5 , and the sixth lens unit G 6  individually move along the optical axis so that the interval between the first lens unit G 1  and the second lens unit G 2 , the interval between the third lens unit G 3  and the fourth lens unit G 4 , the interval between the fourth lens unit G 4  and the fifth lens unit G 5 , and the interval between the fifth lens unit G 5  and the sixth lens unit G 6  increase, and the interval between the second lens unit G 2  and the third lens unit G 3  decreases. 
         [0113]    In the zoom lens system according to Embodiment 3, in focusing from the infinity in-focus condition to the close-object in-focus condition, the fourth lens unit G 4  as a focusing lens unit moves to the image side along the optical axis in any zooming condition. 
         [0114]    The focusing lens unit may be the fifth lens unit G 5  or the sixth lens unit G 6 . 
       4. Embodiment 4 
     FIG.  10   
       [0115]    As shown in  FIG. 10 , the zoom lens system according to Embodiment 4, in order from the object side to the image side, comprises a first lens unit G 1  having positive optical power, a second lens unit G 2  having negative optical power, a third lens unit G 3  having positive optical power, a fourth lens unit G 4  having negative optical power, and a fifth lens unit G 5  having positive optical power. In the zoom lens system according to Embodiment 4, since the respective lens units are arranged in the above optical power allocation, size reduction of the entire lens system is achieved while maintaining excellent optical performance. 
         [0116]    The first lens unit G 1 , in order from the object side to the image side, comprises: a negative meniscus first lens element L 1  with the convex surface facing the object side; a bi-convex second lens element L 2 ; a positive meniscus third lens element L 3  with the convex surface facing the object side; and a positive meniscus fourth lens element L 4  with the convex surface facing the object side. Among these, the first lens element L 1  and the second lens element L 2  are cemented with each other. 
         [0117]    The second lens unit G 2 , in order from the object side to the image side, comprises: a negative meniscus fifth lens element L 5  with the convex surface facing the object side; a bi-concave sixth lens element L 6 ; a bi-convex seventh lens element L 7 ; and a positive meniscus eighth lens element L 8  with the convex surface facing the object side. Among these, the sixth lens element L 6  and the seventh lens element L 7  are cemented with each other. The fifth lens element L 5  has two aspheric surfaces. 
         [0118]    The third lens unit G 3 , in order from the object side to the image side, comprises: a bi-convex ninth lens element L 9 ; a bi-convex tenth lens element L 10 ; a bi-concave eleventh lens element L 11 ; and a bi-convex twelfth lens element L 12 . Among these, the tenth lens element L 10  and the eleventh lens element L 11  are cemented with each other. The ninth lens element L 9  has two aspheric surfaces. 
         [0119]    The fourth lens unit G 4  comprises solely a bi-concave thirteenth lens element L 13 . 
         [0120]    The fifth lens unit G 5  comprises solely a bi-convex fourteenth lens element L 14 . The fourteenth lens element L 14  has two aspheric surfaces. 
         [0121]    An aperture diaphragm A is disposed between the second lens unit G 2  and the third lens unit G 3 . 
         [0122]    In the zoom lens system according to Embodiment 4, the entirety of the third lens unit G 3  corresponds to an image blur compensation lens unit described later which moves in a direction perpendicular to the optical axis to optically compensate for image blur. 
         [0123]    In the zoom lens system according to Embodiment 4, in zooming from the wide-angle limit to the telephoto limit at the time of image taking, the first lens unit G 1  moves to the object side, the second lens unit G 2  and the fourth lens unit G 4  move with locus of a convex to the image side, the third lens unit G 3  monotonically moves to the object side, and the fifth lens unit G 5  moves to the image side. That is, in zooming, the first lens unit G 1 , the second lens unit G 2 , the third lens unit G 3 , the fourth lens unit G 4 , and the fifth lens unit G 5  individually move along the optical axis so that the interval between the first lens unit G 1  and the second lens unit G 2 , the interval between the third lens unit G 3  and the fourth lens unit G 4 , and the interval between the fourth lens unit G 4  and the fifth lens unit G 5  increase, and the interval between the second lens unit G 2  and the third lens unit G 3  decreases. 
         [0124]    In the zoom lens system according to Embodiment 4, in focusing from the infinity in-focus condition to the close-object in-focus condition, the fourth lens unit G 4  as a focusing lens unit moves to the image side along the optical axis in any zooming condition. 
         [0125]    The focusing lens unit may be the fifth lens unit G 5 . 
       5. Embodiment 5 
     FIG.  13   
       [0126]    As shown in  FIG. 13 , the zoom lens system according to Embodiment 5, in order from the object side to the image side, comprises a first lens unit G 1  having positive optical power, a second lens unit G 2  having negative optical power, a third lens unit G 3  having positive optical power, a fourth lens unit G 4  having negative optical power, and a fifth lens unit G 5  having positive optical power. In the zoom lens system according to Embodiment 5, since the respective lens units are arranged in the above optical power allocation, size reduction of the entire lens system is achieved while maintaining excellent optical performance. 
         [0127]    The first lens unit G 1 , in order from the object side to the image side, comprises: a negative meniscus first lens element L 1  with the convex surface facing the object side; a bi-convex second lens element L 2 ; and a positive meniscus third lens element L 3  with the convex surface facing the object side. Among these, the first lens element L 1  and the second lens element L 2  are cemented with each other. 
         [0128]    The second lens unit G 2 , in order from the object side to the image side, comprises: a negative meniscus fourth lens element L 4  with the convex surface facing the object side; a bi-concave fifth lens element L 5 ; and a bi-convex sixth lens element L 6 . 
         [0129]    The third lens unit G 3 , in order from the object side to the image side, comprises: a bi-convex seventh lens element L 7 ; a positive meniscus eighth lens element L 8  with the convex surface facing the image side; a bi-concave ninth lens element L 9 ; and a bi-convex tenth lens element L 10 . Among these, the eighth lens element L 8  and the ninth lens element L 9  are cemented with each other. The seventh lens element L 7  has two aspheric surfaces. 
         [0130]    The fourth lens unit G 4  comprises solely a bi-concave eleventh lens element L 11 . 
         [0131]    The fifth lens unit G 5  comprises solely a bi-convex twelfth lens element L 12 . The twelfth lens element L 12  has two aspheric surfaces. 
         [0132]    An aperture diaphragm A is disposed between the second lens unit G 2  and the third lens unit G 3 . 
         [0133]    In the zoom lens system according to Embodiment 5, the entirety of the third lens unit G 3  corresponds to an image blur compensation lens unit described later which moves in a direction perpendicular to the optical axis to optically compensate for image blur. 
         [0134]    In the zoom lens system according to Embodiment 5, in zooming from the wide-angle limit to the telephoto limit at the time of image taking, the first lens unit G 1  moves to the object side, the second lens unit G 2  and the fourth lens unit G 4  move with locus of a convex to the image side, the third lens unit G 3  monotonically moves to the object side, and the fifth lens unit G 5  moves to the image side. That is, in zooming, the first lens unit G 1 , the second lens unit G 2 , the third lens unit G 3 , the fourth lens unit G 4 , and the fifth lens unit G 5  individually move along the optical axis so that the interval between the first lens unit G 1  and the second lens unit G 2 , the interval between the third lens unit G 3  and the fourth lens unit G 4 , and the interval between the fourth lens unit G 4  and the fifth lens unit G 5  increase, and the interval between the second lens unit G 2  and the third lens unit G 3  decreases. 
         [0135]    In the zoom lens system according to Embodiment 5, in focusing from the infinity in-focus condition to the close-object in-focus condition, the fourth lens unit G 4  as a focusing lens unit moves to the image side along the optical axis in any zooming condition. 
         [0136]    The focusing lens unit may be the fifth lens unit G 5 . 
       6. Summary of Embodiments 1 to 5 
       [0137]    As described above, Embodiments 1 to 5 have been described as examples of art disclosed in the present application. However, the art in the present disclosure is not limited to these embodiments. It is understood that various modifications, replacements, additions, omissions, and the like have been performed in these embodiments to give optional embodiments, and the art in the present disclosure can be applied to the optional embodiments. 
         [0138]    The following description is given for conditions that a zoom lens system like the zoom lens systems according to Embodiments 1 to 5 can satisfy. Here, a plurality of beneficial conditions are set forth for the zoom lens system according to each embodiment. A construction that satisfies all the plurality of conditions is most effective for the zoom lens system. However, when an individual condition is satisfied, a zoom lens system having the corresponding effect is obtained. 
         [0139]    For example, in a zoom lens system like the zoom lens systems according to Embodiments 1 to 5, which includes, in order from the object side to the image side, a first lens unit having positive optical power, a second lens unit having negative optical power, a third lens unit having positive optical power, a fourth lens unit having optical power, and a fifth lens unit having optical power and in which, in zooming from a wide-angle limit to a telephoto limit at the time of image taking, at least the first lens unit, the second lens unit, and the third lens unit move along the optical axis so that the interval between the first lens unit and the second lens unit at the telephoto limit becomes larger than that at the wide-angle limit and the interval between the second lens unit and the third lens unit at the telephoto limit becomes narrower than that at the wide-angle limit, and an aperture diaphragm is disposed between the second lens unit and the third lens unit (this lens configuration is referred to as a basic configuration of the embodiments, hereinafter), the following condition (1) is satisfied: 
         [0000]      18.5&lt; f   G1   /f   W &lt;30.0  (1)
 
         [0140]    where 
         [0141]    f G1  is the focal length of the first lens unit, and 
         [0142]    f W  is the focal length of the entire system at the wide-angle limit. 
         [0143]    The condition (1) sets forth the ratio of the focal length of the first lens unit to the focal length of the entire system at the wide-angle limit. When the value goes below the lower limit of the condition (1), the focal length of the first lens unit becomes excessively short, which makes it difficult to compensate for various aberrations over the entire system and to ensure desired optical performance. When the value exceeds the upper limit of the condition (1), the focal length of the first lens unit becomes excessively long, whereby the amount of movement of the first lens unit in zooming is increased and the overall length of the lens system is excessively increased, which makes it difficult to provide a compact lens barrel, imaging device, and camera. 
         [0144]    When at least one of the following conditions (1)′ and (1)″ is further satisfied, the above-mentioned effect is achieved more successfully. 
         [0000]      19.5&lt; f   G1   /f   W   (1)′
 
         [0000]        f   G1   /f   W &lt;25.0  (1)″
 
         [0145]    Each of the zoom lens systems according to Embodiments 1 to 3 is a zoom lens system having the basic configuration and including the sixth lens unit having optical power, on the image side relative to the fifth lens unit. 
         [0146]    In the zoom lens systems according to Embodiments 1 and 2, the fourth lens unit has positive optical power, the fifth lens unit has negative optical power, the sixth lens unit has positive optical power, and the fourth lens unit is a focusing lens unit that moves along the optical axis in focusing from the infinity in-focus condition to the close-object in-focus condition. In zooming from the wide-angle limit to the telephoto limit at the time of image taking, the respective lens units move along the optical axis so that the interval between the third lens unit and the fourth lens unit at the telephoto limit becomes larger than that at the wide-angle limit. For example, it is beneficial for a zoom lens system like the zoom lens systems according to Embodiments 1 and 2 to satisfy the following condition (2): 
         [0000]      1.1&lt; m   6T   /m   6W &lt;2.0  (2)
 
         [0147]    where 
         [0148]    m 6T  is the lateral magnification of the sixth lens unit at the telephoto limit, and 
         [0149]    m 6W  is the lateral magnification of the sixth lens unit at the wide-angle limit. 
         [0150]    In the zoom lens system according to Embodiment 3, the fourth lens unit has negative optical power, the fifth lens unit has negative optical power, the sixth lens unit has positive optical power, and the fourth lens unit is a focusing lens unit that moves along the optical axis in focusing from the infinity in-focus condition to the close-object in-focus condition. In zooming from the wide-angle limit to the telephoto limit at the time of image taking, the respective lens units move along the optical axis so that the interval between the third lens unit and the fourth lens unit at the telephoto limit becomes larger than that at the wide-angle limit. For example, it is beneficial for a zoom lens system like the zoom lens system according to Embodiment 3 to satisfy the above condition (2). 
         [0151]    The condition (2) sets forth the ratio of the lateral magnification of the sixth lens unit at the telephoto limit to the lateral magnification of the sixth lens unit at the wide-angle limit. When the value goes below the lower limit of the condition (2), the lateral magnification of the sixth lens unit at the telephoto limit becomes excessively small, which makes it difficult to compensate for various aberrations, particularly the curvature of field. When the value exceeds the upper limit of the condition (2), the lateral magnification of the sixth lens unit at the wide-angle limit becomes excessively small, which makes it difficult to compensate for various aberrations, particularly the curvature of field. 
         [0152]    When at least one of the following conditions (2)′ and (2)″ is further satisfied, the above-mentioned effect is achieved more successfully. 
         [0000]      1.3&lt; m   6T   /m   6W   (2)′
 
         [0000]        m   6T   /m   6W &lt;1.8  (2)″
 
         [0153]    In the zoom lens systems according to Embodiments 4 and 5, in the zoom lens system having the basic configuration, the fourth lens unit has negative optical power, the fifth lens unit has positive optical power, and the fourth lens unit is a focusing lens unit that moves along the optical axis in focusing from the infinity in-focus condition to the close-object in-focus condition. In zooming from the wide-angle limit to the telephoto limit at the time of image taking, the respective lens units move along the optical axis so that the interval between the third lens unit and the fourth lens unit at the telephoto limit becomes larger than that at the wide-angle limit. For example, it is beneficial for a zoom lens system like the zoom lens systems according to Embodiments 4 and 5 to satisfy the following condition (3): 
         [0000]      1.1&lt; m   5T   /m   5W &lt;2.0  (3)
 
         [0154]    where 
         [0155]    m 5T  is the lateral magnification of the fifth lens unit at the telephoto limit, and 
         [0156]    m 5W  is the lateral magnification of the fifth lens unit at the wide-angle limit. 
         [0157]    The condition (3) sets forth the ratio of the lateral magnification of the fifth lens unit at the telephoto limit to the lateral magnification of the fifth lens unit at the wide-angle limit. When the value goes below the lower limit of the condition (3), the lateral magnification of the fifth lens unit at the telephoto limit becomes excessively small, which makes it difficult to compensate for various aberrations, particularly the curvature of field. When the value exceeds the upper limit of the condition (3), the lateral magnification of the fifth lens unit at the wide-angle limit becomes excessively small, which makes it difficult to compensate for various aberrations, particularly the curvature of field. 
         [0158]    When at least one of the following conditions (3)′ and (3)″ is further satisfied, the above-mentioned effect is achieved more successfully. 
         [0000]      1.3&lt; m   5T   m   5W   (3)′
 
         [0000]        m   5T   /m   5W &lt;1.8  (3)″
 
         [0159]    In each of the zoom lens systems according to the present disclosure, any one of the lens units constituting the zoom lens system or a sub lens unit corresponding to a part of each lens unit can be used as an image blur compensation lens unit that moves in a direction perpendicular to the optical axis to optically compensate for image blur. In the zoom lens systems according to Embodiments 1 to 5, by moving the entirety of the third lens unit G 3  in the direction perpendicular to the optical axis, image point movement caused by vibration of the entire system is compensated. That is, image blur caused by hand blurring, vibration and the like is optically compensated. 
         [0160]    When compensating for the image point movement caused by vibration of the entire system, the image blur compensation lens unit moves in the direction perpendicular to the optical axis. Thereby, image blur can be compensated for in a state that size increase in the entire zoom lens system is suppressed to realize a compact configuration and that excellent imaging characteristics such as small decentering coma aberration and small decentering astigmatism are satisfied. 
         [0161]    In the case where one lens unit is composed of a plurality of lens elements, the sub lens unit corresponding to a part of each lens unit is any one lens element or a plurality of adjacent lens elements among the plurality of lens elements. 
         [0162]    Each of the lens units constituting the zoom lens systems according to Embodiments 1 to 5 is composed exclusively of refractive type lens elements that deflect the incident light by refraction (that is, lens elements of a type in which deflection is achieved at the interface between media each having a distinct refractive index). However, the present disclosure is not limited to this. For example, the lens units may employ diffractive type lens elements that deflect the incident light by diffraction; refractive-diffractive hybrid type lens elements that deflect the incident light by a combination of diffraction and refraction; or gradient index type lens elements that deflect the incident light by distribution of refractive index in the medium. In particular, in the refractive-diffractive hybrid type lens elements, when a diffraction structure is formed in the interface between media having mutually different refractive indices, wavelength dependence in the diffraction efficiency is improved. 
       Embodiment 6 
       [0163]      FIG. 16  is a schematic configuration diagram of a digital still camera according to Embodiment 6. In  FIG. 16 , the digital still camera comprises a zoom lens system  1 , an image sensor  2 , a liquid crystal display monitor  3 , and a body  4 . An imaging device includes the zoom lens system  1  and the image sensor  2 . The zoom lens system  1  comprises a first lens unit G 1 , a second lens unit G 2 , a third lens unit G 3 , a fourth lens unit G 4 , a fifth lens unit G 5 , and a sixth lens unit G 6 . In the body  4 , the zoom lens system  1  is arranged on the front side, while the image sensor  2  is arranged on the rear side of the zoom lens system  1 . On the rear side of the body  4 , the liquid crystal display monitor  3  is arranged. An optical image of a photographic object generated by the zoom lens system  1  is formed on an image surface S. 
         [0164]      FIG. 16  shows the case where the zoom lens system according to Embodiment 1 is used as the zoom lens system  1 . However, any one of the zoom lens systems according to Embodiments 2 to 5 may be used instead of the zoom lens system according to Embodiment 1. Further, the optical system of the digital still camera shown in  FIG. 16  is applicable also to a digital video camera for moving images. In this case, moving images with high resolution can be acquired in addition to still images. 
         [0165]    As described above, Embodiment 6 has been described as an example of art disclosed in the present application. However, the art in the present disclosure is not limited to this embodiment. It is understood that various modifications, replacements, additions, omissions, and the like have been performed in this embodiment to give optional embodiments, and the art in the present disclosure can be applied to the optional embodiments. 
         [0166]    Furthermore, an imaging device composed of a zoom lens system according to any one of Embodiments 1 to 5 and an image sensor such as a CCD or a CMOS may be applied to a camera for a mobile terminal device such as a smart-phone, a surveillance camera in a surveillance system, a Web camera, a vehicle-mounted camera or the like. 
       NUMERICAL EXAMPLES 
       [0167]    The following description is given for numerical examples in which the zoom lens system according to Embodiments 1 to 5 are implemented practically. In the numerical examples, the units of the length in the tables are all “mm”, while the units of the view angle are all “°”. Moreover, in the numerical examples, r is the radius of curvature, d is the axial distance, nd is the refractive index to the d-line, and vd is the Abbe number to the d-line. In the numerical examples, the surfaces marked with * are aspheric surfaces, and the aspheric surface configuration is defined by the following expression: 
         [0000]    
       
         
           
             Z 
             = 
             
               
                 
                   
                     h 
                     2 
                   
                    
                   
                     / 
                   
                    
                   r 
                 
                 
                   1 
                   + 
                   
                     
                       1 
                       - 
                       
                         
                           ( 
                           
                             1 
                             + 
                             κ 
                           
                           ) 
                         
                          
                         
                           
                             ( 
                             
                               h 
                                
                               
                                 / 
                               
                                
                               r 
                             
                             ) 
                           
                           2 
                         
                       
                     
                   
                 
               
               + 
               
                 ∑ 
                 
                     
                 
                  
                 
                   
                     A 
                     n 
                   
                    
                   
                     h 
                     n 
                   
                 
               
             
           
         
       
     
         [0168]    where 
         [0169]    Z is the distance from a point on an aspherical surface at a height h relative to the optical axis to a tangential plane at the vertex of the aspherical surface, 
         [0170]    h is the height relative to the optical axis, 
         [0171]    r is the radius of curvature at the top, 
         [0172]    κ is the conic constant, and 
         [0173]    A n  is the n-th order aspherical coefficient. 
         [0174]      FIGS. 2, 5, 8, 11, and 14  are longitudinal aberration diagrams of the zoom lens systems according to Embodiments 1 to 5, respectively. 
         [0175]    In each longitudinal aberration diagram, part (a) shows the aberration at a wide-angle limit, part (b) shows the aberration at a middle position, and part (c) shows the aberration at a telephoto limit. Each longitudinal aberration diagram, in order from the left-hand side, shows the spherical aberration (SA (mm)), the astigmatism (AST (mm)) and the distortion (DIS (%)). In each spherical aberration diagram, the vertical axis indicates the F-number (in each Fig., indicated as F), and the solid line, the short dash line, the long dash line and the one-dot dash line indicate the characteristics to the d-line, the F-line, the C-line and the g-line, respectively. In each astigmatism diagram, the vertical axis indicates the image height (in each Fig., indicated as H), and the solid line and the dash line indicate the characteristics to the sagittal plane (in each Fig., indicated as “s”) and the meridional plane (in each Fig., indicated as “m”), respectively. In each distortion diagram, the vertical axis indicates the image height (in each Fig., indicated as H). 
         [0176]      FIGS. 3, 6, 9, 12, and 15  are lateral aberration diagrams of the zoom lens systems at a telephoto limit according to Embodiments 1 to 5, respectively. 
         [0177]    In each lateral aberration diagram, the aberration diagrams in the upper three parts correspond to a basic state where image blur compensation is not performed at a telephoto limit, while the aberration diagrams in the lower three parts correspond to an image blur compensation state where the image blue compensation lens unit (the entirety of the third lens unit G 3 ) is moved by a predetermined amount in a direction perpendicular to the optical axis at a telephoto limit. Among the lateral aberration diagrams of a basic state, the upper part shows the lateral aberration at an image point of 70% of the maximum image height, the middle part shows the lateral aberration at the axial image point, and the lower part shows the lateral aberration at an image point of −70% of the maximum image height. Among the lateral aberration diagrams of an image blur compensation state, the upper part shows the lateral aberration at an image point of 70% of the maximum image height, the middle part shows the lateral aberration at the axial image point, and the lower part shows the lateral aberration at an image point of −70% of the maximum image height. In each lateral aberration diagram, the horizontal axis indicates the distance from the principal ray on the pupil surface, and the solid line, the short dash line, the long dash line and the one-dot dash line indicate the characteristics to the d-line, the F-line, the C-line and the g-line, respectively. In each lateral aberration diagram, the meridional plane is adopted as the plane containing the optical axis of the first lens unit G 1  and the optical axis of the third lens unit G 3 . 
         [0178]    Here, in the zoom lens system according to each example, the amount of movement of the third lens unit G 3  in a direction perpendicular to the optical axis in an image blur compensation state at a telephoto limit is as follows. 
         [0000]    
       
         
               
               
               
             
           
               
                   
                   
               
               
                   
                   
                 Amount of movement 
               
               
                   
                 Example 
                 (mm) 
               
               
                   
                   
               
             
             
               
                   
                 1 
                 0.337 
               
               
                   
                 2 
                 0.310 
               
               
                   
                 3 
                 0.253 
               
               
                   
                 4 
                 0.281 
               
               
                   
                 5 
                 0.281 
               
               
                   
                   
               
             
          
         
       
     
         [0179]    Here, when the shooting distance is infinity, at a telephoto limit, the amount of image decentering in a case that the zoom lens system inclines by a predetermined angle is equal to the amount of image decentering in a case that the image blue compensation lens unit displaces in parallel by each of the above-mentioned values in a direction perpendicular to the optical axis. 
         [0180]    As seen from the lateral aberration diagrams, satisfactory symmetry is obtained in the lateral aberration at the axial image point. Further, when the lateral aberration at the +70% image point and the lateral aberration at the −70% image point are compared with each other in the basic state, all have a small degree of curvature and almost the same inclination in the aberration curve. Thus, decentering coma aberration and decentering astigmatism are small. This indicates that sufficient imaging performance is obtained even in the image blur compensation state. Further, when the image blur compensation angle of a zoom lens system is the same, the amount of parallel translation required for image blur compensation decreases with decreasing focal length of the entire zoom lens system. Thus, at arbitrary zoom positions, sufficient image blur compensation can be performed for image blur compensation angles up to the predetermined angle without degrading the imaging characteristics. 
       Numerical Example 1 
       [0181]    The zoom lens system of Numerical Example 1 corresponds to Embodiment 1 shown in  FIG. 1 . Table 1 shows the surface data of the zoom lens system of Numerical Example 1. Table 2 shows the aspherical data. Table 3 shows the various data in the infinity in-focus condition. 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 1 
               
             
             
               
                   
               
               
                 (surface data) 
               
             
          
           
               
                 Surface number 
                 r 
                 d 
                 nd 
                 vd 
               
               
                   
               
             
          
           
               
                 Object surface 
                 ∞ 
                   
                   
                   
               
               
                  1 
                 86.00230 
                 1.35000 
                 1.80610 
                 33.3 
               
               
                  2 
                 47.46400 
                 0.01000 
                 1.56732 
                 42.8 
               
               
                  3 
                 47.46400 
                 4.43550 
                 1.49700 
                 81.6 
               
               
                  4 
                 −1202.97800 
                 0.20000 
               
               
                  5 
                 47.37700 
                 3.43110 
                 1.49700 
                 81.6 
               
               
                  6 
                 281.37970 
                 Variable 
               
               
                  7 
                 547.82520 
                 0.70000 
                 1.80420 
                 46.5 
               
               
                  8 
                 9.41650 
                 5.55540 
               
               
                  9* 
                 −16.51970 
                 0.70000 
                 1.76681 
                 49.7 
               
               
                 10* 
                 38.34820 
                 0.43500 
               
               
                 11 
                 20.80940 
                 2.08260 
                 1.94595 
                 18.0 
               
               
                 12 
                 947.29690 
                 Variable 
               
               
                 13(Diaphragm) 
                 ∞ 
                 0.50000 
               
               
                 14* 
                 11.72260 
                 2.86640 
                 1.58332 
                 59.1 
               
               
                 15* 
                 −40.62510 
                 1.38970 
               
               
                 16 
                 14.51810 
                 2.45190 
                 1.49700 
                 81.6 
               
               
                 17 
                 −19.87650 
                 0.01000 
                 1.56732 
                 42.8 
               
               
                 18 
                 −19.87650 
                 0.50000 
                 1.80610 
                 33.3 
               
               
                 19 
                 11.28530 
                 1.32450 
               
               
                 20 
                 −73.09930 
                 1.90480 
                 1.58144 
                 40.9 
               
               
                 21 
                 −14.37870 
                 Variable 
               
               
                 22* 
                 −25.35330 
                 0.60000 
                 1.63550 
                 23.9 
               
               
                 23 
                 −54.00470 
                 0.20000 
               
               
                 24 
                 22.14390 
                 1.80540 
                 1.54410 
                 56.1 
               
               
                 25* 
                 −40.03450 
                 Variable 
               
               
                 26* 
                 −162.84400 
                 0.60000 
                 1.54410 
                 56.1 
               
               
                 27 
                 15.56530 
                 Variable 
               
               
                 28* 
                 −31.01180 
                 1.64060 
                 1.54410 
                 56.1 
               
               
                 29* 
                 −7.95930 
                 Variable 
               
               
                 30 
                 ∞ 
                 0.78000 
                 1.51680 
                 64.2 
               
               
                 31 
                 ∞ 
                 (BF) 
               
               
                 Image surface 
                 ∞ 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
             
           
               
                 TABLE 2 
               
               
                   
               
               
                 (Aspherical data) 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surface No. 9 
               
               
                   
                 K = 0.00000E+00, A4 = 6.42418E−05, A6 = 5.26538E−06, 
               
               
                   
                 A8 = −8.74983E−08 A10 = 4.12908E−10 
               
               
                   
                 Surface No. 10 
               
               
                   
                 K = 0.00000E+00, A4 = 1.00415E−04, A6 = 3.41384E−06, 
               
               
                   
                 A8 = −7.51738E−08 A10 = 3.89772E−10 
               
               
                   
                 Surface No. 14 
               
               
                   
                 K = 0.00000E+00, A4 = −5.21767E−05, A6 = −5.23261E−07, 
               
               
                   
                 A8 = 2.42438E−09 A10 = −1.47501E−10 
               
               
                   
                 Surface No. 15 
               
               
                   
                 K = 0.00000E+00, A4 = 5.17974E−05, A6 = −5.38305E−07, 
               
               
                   
                 A8 = −3.81085E−09 A10 = −2.33806E−11 
               
               
                   
                 Surface No. 22 
               
               
                   
                 K = 0.00000E+00, A4 = −1.51018E−05, A6 = 1.20032E−07, 
               
               
                   
                 A8 = −1.27960E−08 A10 = −1.29107E−10 
               
               
                   
                 Surface No. 25 
               
               
                   
                 K = 0.00000E+00, A4 = −5.21956E−07, A6 = 1.99204E−07, 
               
               
                   
                 A8 = −1.50590E−08 A10 = 6.63478E−11 
               
               
                   
                 Surface No. 26 
               
               
                   
                 K = 0.00000E+00, A4 = −6.60473E−05, A6 = 3.19059E−06, 
               
               
                   
                 A8 = −3.64389E−07 A10 = 1.28053E−08 
               
               
                   
                 Surface No. 28 
               
               
                   
                 K = 0.00000E+00, A4 = −1.27868E−03, A6 = 4.29123E−05, 
               
               
                   
                 A8 = −3.15128E−06 A10 = 3.42649E−08 
               
               
                   
                 Surface No. 29 
               
               
                   
                 K = 0.00000E+00, A4 = −8.50894E−04, A6 = 6.45084E−05, 
               
               
                   
                 A8 = −3.84172E−06 A10 = 5.33891E−08 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
             
               
               
               
             
           
               
                 TABLE 3 
               
               
                   
               
               
                 (Various data in infinity in-focus condition) 
               
               
                   
               
             
             
               
                 Zooming ratio 56.00512 
               
             
          
           
               
                   
                   
                 Wide-angle 
                 Middle 
                 Telephoto 
               
               
                   
                   
                 limit 
                 position 
                 limit 
               
               
                   
                   
               
               
                   
                 Focal length 
                 3.7098 
                 27.7644 
                 207.7671 
               
               
                   
                 F-number 
                 2.90020 
                 5.67685 
                 6.10109 
               
               
                   
                 Half view angle 
                 47.7568 
                 7.8898 
                 1.0597 
               
               
                   
                 Image height 
                 3.4080 
                 3.9020 
                 3.9020 
               
               
                   
                 Overall length of 
                 90.8772 
                 113.6060 
                 149.9617 
               
               
                   
                 lens system 
               
               
                   
                 BF 
                 0.86547 
                 0.87350 
                 0.83168 
               
               
                   
                 d6 
                 0.5000 
                 31.9869 
                 61.3438 
               
               
                   
                 d12 
                 41.9101 
                 10.3600 
                 1.5000 
               
               
                   
                 d21 
                 2.4927 
                 18.6493 
                 32.5536 
               
               
                   
                 d25 
                 2.0073 
                 9.8558 
                 3.0040 
               
               
                   
                 d27 
                 2.0000 
                 5.0000 
                 13.9874 
               
               
                   
                 d29 
                 5.6287 
                 1.4076 
                 1.2683 
               
               
                   
                   
               
             
          
           
               
                 Zoom lens unit data 
               
             
          
           
               
                 Lens unit 
                 Initial surface No. 
                 Focal length 
               
               
                   
               
               
                 1 
                 1 
                 83.68280 
               
               
                 2 
                 7 
                 −8.99464 
               
               
                 3 
                 13 
                 19.12526 
               
               
                 4 
                 22 
                 39.62290 
               
               
                 5 
                 26 
                 −26.08067 
               
               
                 6 
                 28 
                 19.19766 
               
               
                   
               
             
          
         
       
     
       Numerical Example 2 
       [0182]    The zoom lens system of Numerical Example 2 corresponds to Embodiment 2 shown in  FIG. 4 . Table 4 shows the surface data of the zoom lens system of Numerical Example 2. Table 5 shows aspherical data. Table 6 shows various data in infinity in-focus condition. 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 4 
               
             
             
               
                   
               
               
                 (surface data) 
               
             
          
           
               
                 Surface number 
                 r 
                 d 
                 nd 
                 vd 
               
               
                   
               
             
          
           
               
                 Object surface 
                 ∞ 
                   
                   
                   
               
               
                  1 
                 104.45080 
                 1.35000 
                 1.80610 
                 33.3 
               
               
                  2 
                 50.90580 
                 0.01000 
                 1.56732 
                 42.8 
               
               
                  3 
                 50.90580 
                 4.82620 
                 1.49700 
                 81.6 
               
               
                  4 
                 −543.08740 
                 0.20000 
               
               
                  5 
                 46.82610 
                 3.46080 
                 1.59282 
                 68.6 
               
               
                  6 
                 152.61140 
                 Variable 
               
               
                  7 
                 133.53650 
                 0.70000 
                 1.80420 
                 46.5 
               
               
                  8 
                 8.49340 
                 5.81150 
               
               
                  9* 
                 −13.83640 
                 0.70000 
                 1.77200 
                 50.0 
               
               
                 10* 
                 63.83110 
                 0.42060 
               
               
                 11 
                 29.35740 
                 1.95420 
                 1.94595 
                 18.0 
               
               
                 12 
                 −70.15780 
                 Variable 
               
               
                 13(Diaphragm) 
                 ∞ 
                 0.50000 
               
               
                 14 
                 11.49050 
                 2.15370 
                 1.62041 
                 60.3 
               
               
                 15 
                 100.00000 
                 4.03840 
               
               
                 16* 
                 15.46890 
                 3.44350 
                 1.55332 
                 71.7 
               
               
                 17 
                 −11.07510 
                 0.01000 
                 1.56732 
                 42.8 
               
               
                 18 
                 −11.07510 
                 0.50000 
                 1.80610 
                 33.3 
               
               
                 19 
                 17.02280 
                 0.96520 
               
               
                 20 
                 361.75920 
                 1.76250 
                 1.54410 
                 56.1 
               
               
                 21 
                 −14.30370 
                 Variable 
               
               
                 22 
                 17.31510 
                 1.11230 
                 1.54410 
                 56.1 
               
               
                 23 
                 82.78790 
                 Variable 
               
               
                 24 
                 −27.70670 
                 0.50000 
                 1.49700 
                 81.6 
               
               
                 25 
                 12.25950 
                 Variable 
               
               
                 26* 
                 26.33220 
                 2.56000 
                 1.54410 
                 56.1 
               
               
                 27* 
                 −10.81750 
                 Variable 
               
               
                 28 
                 ∞ 
                 0.78000 
                 1.51680 
                 64.2 
               
               
                 29 
                 ∞ 
                 (BF) 
               
               
                 Image surface 
                 ∞ 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
             
           
               
                 TABLE 5 
               
               
                   
               
               
                 (Aspherical data) 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surface No. 9 
               
               
                   
                 K = 0.00000E+00, A4 = 1.43019E−04, A6 = 2.74470E−06, 
               
               
                   
                 A8 = −7.80981E−08 A10 = 5.36677E−10 
               
               
                   
                 Surface No. 10 
               
               
                   
                 K = 0.00000E+00, A4 = 1.29417E−04, A6 = 7.19533E−07, 
               
               
                   
                 A8 = −5.80983E−08 A10 = 4.77012E−10 
               
               
                   
                 Surface No. 16 
               
               
                   
                 K = 0.00000E+00, A4 = −1.56386E−04, A6 = −7.88420E−07, 
               
               
                   
                 A8 = 1.88743E−09 A10 = −2.53388E−10 
               
               
                   
                 Surface No. 26 
               
               
                   
                 K = 0.00000E+00, A4 = −4.14955E−04, A6 = 1.61134E−05, 
               
               
                   
                 A8 = −2.07107E−07 A10 = 4.36533E−09 
               
               
                   
                 Surface No. 27 
               
               
                   
                 K = 0.00000E+00, A4 = −1.54889E−04, A6 = 1.99095E−05, 
               
               
                   
                 A8 = −1.02510E−07 A10 = −6.16053E−10 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
             
               
               
               
             
           
               
                 TABLE 6 
               
               
                   
               
               
                 (Various data in infinity in-focus condition) 
               
               
                   
               
             
             
               
                 Zooming ratio 55.97618 
               
             
          
           
               
                   
                   
                 Wide-angle 
                 Middle 
                 Telephoto 
               
               
                   
                   
                 limit 
                 position 
                 limit 
               
               
                   
                   
               
               
                   
                 Focal length 
                 3.7099 
                 27.7639 
                 207.6670 
               
               
                   
                 F-number 
                 2.90017 
                 5.35598 
                 6.09833 
               
               
                   
                 Half view angle 
                 47.5874 
                 7.8566 
                 1.0678 
               
               
                   
                 Image height 
                 3.4080 
                 3.9020 
                 3.9020 
               
               
                   
                 Overall length of 
                 87.8697 
                 115.1827 
                 149.9656 
               
               
                   
                 lens system 
               
               
                   
                 BF 
                 0.87250 
                 0.87502 
                 0.83536 
               
               
                   
                 d6 
                 0.5000 
                 38.0000 
                 65.6266 
               
               
                   
                 d12 
                 38.0000 
                 9.5098 
                 1.5000 
               
               
                   
                 d21 
                 1.7974 
                 14.6317 
                 23.2941 
               
               
                   
                 d23 
                 2.0026 
                 8.0931 
                 2.9963 
               
               
                   
                 d25 
                 2.0000 
                 5.0000 
                 16.9543 
               
               
                   
                 d27 
                 4.9383 
                 1.3142 
                 1.0000 
               
               
                   
                   
               
             
          
           
               
                 Zoom lens unit data 
               
             
          
           
               
                 Lens unit 
                 Initial surface No. 
                 Focal length 
               
               
                   
               
               
                 1 
                 1 
                 87.83129 
               
               
                 2 
                 7 
                 −8.76270 
               
               
                 3 
                 13 
                 18.42267 
               
               
                 4 
                 22 
                 40.00001 
               
               
                 5 
                 24 
                 −17.02984 
               
               
                 6 
                 26 
                 14.44295 
               
               
                   
               
             
          
         
       
     
       Numerical Example 3 
       [0183]    The zoom lens system of Numerical Example 3 corresponds to Embodiment 3 shown in  FIG. 7 . Table 7 shows the surface data of the zoom lens system of Numerical Example 3. Table 8 shows aspherical data. Table 9 shows the various data in infinity in-focus condition. 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 7 
               
             
             
               
                   
               
               
                 (surface data) 
               
             
          
           
               
                 Surface number 
                 r 
                 d 
                 nd 
                 vd 
               
               
                   
               
             
          
           
               
                 Object surface 
                 ∞ 
                   
                   
                   
               
               
                  1 
                 101.04660 
                 1.70000 
                 1.80610 
                 33.3 
               
               
                  2 
                 50.29840 
                 0.01000 
                 1.56732 
                 42.8 
               
               
                  3 
                 50.29840 
                 4.59890 
                 1.49700 
                 81.6 
               
               
                  4 
                 −915.77430 
                 0.20000 
               
               
                  5 
                 47.57360 
                 3.35840 
                 1.59282 
                 68.6 
               
               
                  6 
                 151.30440 
                 Variable 
               
               
                  7 
                 90.02690 
                 1.00000 
                 1.80420 
                 46.5 
               
               
                  8 
                 8.41060 
                 5.96030 
               
               
                  9* 
                 −13.67970 
                 0.70000 
                 1.77200 
                 50.0 
               
               
                 10* 
                 39.29940 
                 0.20000 
               
               
                 11 
                 27.46550 
                 2.02830 
                 1.94595 
                 18.0 
               
               
                 12 
                 −61.88720 
                 Variable 
               
               
                 13(Diaphragm) 
                 ∞ 
                 0.50000 
               
               
                 14* 
                 11.71920 
                 2.96540 
                 1.60602 
                 57.4 
               
               
                 15* 
                 −36.45880 
                 2.18400 
               
               
                 16 
                 26.19990 
                 1.79380 
                 1.49700 
                 81.6 
               
               
                 17 
                 −28.29220 
                 0.01000 
                 1.56732 
                 42.8 
               
               
                 18 
                 −28.29220 
                 0.50000 
                 1.80610 
                 33.3 
               
               
                 19 
                 10.25980 
                 1.75320 
               
               
                 20 
                 16.76280 
                 3.10060 
                 1.49700 
                 81.6 
               
               
                 21 
                 −13.39240 
                 Variable 
               
               
                 22* 
                 25.37060 
                 0.50000 
                 1.49700 
                 81.6 
               
               
                 23 
                 15.82780 
                 Variable 
               
               
                 24 
                 −13.09360 
                 0.50000 
                 1.49700 
                 81.6 
               
               
                 25 
                 −63.24920 
                 Variable 
               
               
                 26* 
                 26.84170 
                 2.28190 
                 1.54410 
                 56.1 
               
               
                 27* 
                 −12.23030 
                 Variable 
               
               
                 28 
                 ∞ 
                 0.78000 
                 1.51680 
                 64.2 
               
               
                 29 
                 ∞ 
                 (BF) 
               
               
                 Image surface 
                 ∞ 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
             
           
               
                 TABLE 8 
               
               
                   
               
               
                 (Aspherical data) 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surface No. 9 
               
               
                   
                 K = 0.00000E+00, A4 = 1.00449E−04, A6 = 4.14158E−06, 
               
               
                   
                 A8 = −1.13090E−07 A10 = 7.71897E−10 
               
               
                   
                 Surface No. 10 
               
               
                   
                 K = 0.00000E+00, A4 = 8.34840E−05, A6 = 1.96741E−06, 
               
               
                   
                 A8 = −8.66211E−08 A10 = 7.18477E−10 
               
               
                   
                 Surface No. 14 
               
               
                   
                 K = −1.68898E+00, A4 = 1.02874E−04, A6 = 1.69686E−07, 
               
               
                   
                 A8 = 2.74156E−08 A10 = −6.65038E−10 
               
               
                   
                 Surface No. 15 
               
               
                   
                 K = 0.00000E+00, A4 = 1.24422E−04, A6 = −1.58596E−07, 
               
               
                   
                 A8 = 2.32560E−08 A10 = −6.94722E−10 
               
               
                   
                 Surface No. 22 
               
               
                   
                 K = 0.00000E+00, A4 = 1.51005E−05, A6 = 6.06276E−07, 
               
               
                   
                 A8 = −1.09490E−09 A10 = −1.37441E−10 
               
               
                   
                 Surface No. 26 
               
               
                   
                 K = 0.00000E+00, A4 = −5.46739E−04, A6 = 4.53405E−05, 
               
               
                   
                 A8 = −2.04305E−06 A10 = 4.00236E−08 
               
               
                   
                 Surface No. 27 
               
               
                   
                 K = 0.00000E+00, A4 = −3.92063E−04, A6 = 5.70284E−05, 
               
               
                   
                 A8 = −2.48640E−06 A10 = 4.66694E−08 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
             
               
               
               
             
           
               
                 TABLE 9 
               
               
                   
               
               
                 (Various data in infinity in-focus condition) 
               
               
                   
               
             
             
               
                 Zooming ratio 56.01093 
               
             
          
           
               
                   
                   
                 Wide-angle 
                 Middle 
                 Telephoto 
               
               
                   
                   
                 limit 
                 position 
                 limit 
               
               
                   
                   
               
               
                   
                 Focal length 
                 3.7100 
                 27.7631 
                 207.7995 
               
               
                   
                 F-number 
                 2.90055 
                 5.14453 
                 6.09905 
               
               
                   
                 Half view angle 
                 47.5795 
                 7.8568 
                 1.0722 
               
               
                   
                 Image height 
                 3.4080 
                 3.9020 
                 3.9020 
               
               
                   
                 Overall length of 
                 89.2051 
                 112.3873 
                 149.9538 
               
               
                   
                 lens system 
               
               
                   
                 BF 
                 0.86922 
                 0.89449 
                 0.81929 
               
               
                   
                 d6 
                 0.7000 
                 38.0000 
                 68.0438 
               
               
                   
                 d12 
                 37.9693 
                 8.0576 
                 1.5000 
               
               
                   
                 d21 
                 1.3000 
                 19.4149 
                 9.4993 
               
               
                   
                 d23 
                 3.8687 
                 5.0000 
                 16.4666 
               
               
                   
                 d25 
                 2.0000 
                 2.3000 
                 16.0000 
               
               
                   
                 d27 
                 5.8731 
                 2.0955 
                 1.0000 
               
               
                   
                   
               
             
          
           
               
                 Zoom lens unit data 
               
             
          
           
               
                 Lens unit 
                 Initial surface No. 
                 Focal length 
               
               
                   
               
               
                 1 
                 1 
                 91.23618 
               
               
                 2 
                 7 
                 −8.36202 
               
               
                 3 
                 13 
                 16.55291 
               
               
                 4 
                 22 
                 −86.16731 
               
               
                 5 
                 24 
                 −33.33346 
               
               
                 6 
                 26 
                 15.76644 
               
               
                   
               
             
          
         
       
     
       Numerical Example 4 
       [0184]    The zoom lens system of Numerical Example 4 corresponds to Embodiment 4 shown in  FIG. 10 . Table 10 shows the surface data of the zoom lens system of Numerical Example 4. Table 11 shows aspherical data. Table 12 shows the various data in infinity in-focus condition. 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 10 
               
             
             
               
                   
               
               
                 (surface data) 
               
             
          
           
               
                 Surface number 
                 r 
                 d 
                 nd 
                 vd 
               
               
                   
               
             
          
           
               
                 Object surface 
                 ∞ 
                   
                   
                   
               
               
                  1 
                 183.98470 
                 1.70000 
                 1.80610 
                 33.3 
               
               
                  2 
                 67.92430 
                 4.38180 
                 1.49700 
                 81.6 
               
               
                  3 
                 −1488.09180 
                 0.20000 
               
               
                  4 
                 63.96440 
                 3.10620 
                 1.49700 
                 81.6 
               
               
                  5 
                 338.34500 
                 0.20000 
               
               
                  6 
                 62.14300 
                 2.06570 
                 1.59282 
                 68.6 
               
               
                  7 
                 118.16060 
                 Variable 
               
               
                  8* 
                 110.17070 
                 1.00000 
                 1.80420 
                 46.5 
               
               
                  9* 
                 8.55240 
                 6.52500 
               
               
                 10 
                 −15.97770 
                 0.50000 
                 1.83400 
                 37.3 
               
               
                 11 
                 24.12240 
                 1.94830 
                 1.94595 
                 18.0 
               
               
                 12 
                 −130.52540 
                 0.20000 
               
               
                 13 
                 36.32690 
                 1.26720 
                 1.94595 
                 18.0 
               
               
                 14 
                 130.15990 
                 Variable 
               
               
                 15(Diaphragm) 
                 ∞ 
                 0.86600 
               
               
                 16* 
                 10.81890 
                 2.98260 
                 1.60602 
                 57.4 
               
               
                 17* 
                 −64.56790 
                 1.40380 
               
               
                 18 
                 25.98340 
                 2.04880 
                 1.49700 
                 81.6 
               
               
                 19 
                 −41.80150 
                 0.50000 
                 1.80610 
                 33.3 
               
               
                 20 
                 10.09100 
                 0.75960 
               
               
                 21 
                 16.22860 
                 2.64960 
                 1.49700 
                 81.6 
               
               
                 22 
                 −15.97040 
                 Variable 
               
               
                 23 
                 −96.55230 
                 1.00000 
                 1.49700 
                 81.6 
               
               
                 24 
                 18.42480 
                 Variable 
               
               
                 25* 
                 15.59150 
                 2.36330 
                 1.54410 
                 56.1 
               
               
                 26* 
                 −28.65170 
                 Variable 
               
               
                 27 
                 ∞ 
                 1.00000 
                 1.51680 
                 64.2 
               
               
                 28 
                 ∞ 
                 (BF) 
               
               
                 Image surface 
                 ∞ 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
             
           
               
                 TABLE 11 
               
               
                   
               
               
                 (Aspherical data) 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surface No. 8 
               
               
                   
                 K = 0.00000E+00, A4 = 3.71891E−05, A6 = −1.52620E−07, 
               
               
                   
                 A8 = −6.22383E−10 A10 = 3.42906E−12 
               
               
                   
                 Surface No. 9 
               
               
                   
                 K = 0.00000E+00, A4 = 1.28467E−05, A6 = −6.55779E−07, 
               
               
                   
                 A8 = 3.18057E−08 A10 = −5.54881E−10 
               
               
                   
                 Surface No. 16 
               
               
                   
                 K = −1.46742E+00, A4 = 1.06548E−04, A6 = −3.95334E−07, 
               
               
                   
                 A8 = 2.32214E−08 A10 = −3.07692E−10 
               
               
                   
                 Surface No. 17 
               
               
                   
                 K = 0.00000E+00, A4 = 9.61720E−05, A6 = −7.66559E−07, 
               
               
                   
                 A8 = 2.05604E−08 A10 = −3.21656E−10 
               
               
                   
                 Surface No. 25 
               
               
                   
                 K = 0.00000E+00, A4 = −9.31931E−05, A6 = 5.33764E−06, 
               
               
                   
                 A8 = −9.18960E−08 A10 = 2.42305E−09 
               
               
                   
                 Surface No. 26 
               
               
                   
                 K = 0.00000E+00, A4 = −2.13550E−05, A6 = 2.42195E−06, 
               
               
                   
                 A8 = 1.65201E−07 A10 = −3.08081E−09 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
             
               
               
               
             
           
               
                 TABLE 12 
               
               
                   
               
               
                 (Various data in infinity in-focus condition) 
               
               
                   
               
             
             
               
                 Zooming ratio 65.29142 
               
             
          
           
               
                   
                   
                 Wide-angle 
                 Middle 
                 Telephoto 
               
               
                   
                   
                 limit 
                 position 
                 limit 
               
               
                   
                   
               
               
                   
                 Focal length 
                 3.7003 
                 29.9025 
                 241.5946 
               
               
                   
                 F-number 
                 3.40044 
                 6.18470 
                 6.72954 
               
               
                   
                 Half view angle 
                 47.8740 
                 7.2988 
                 0.9130 
               
               
                   
                 Image height 
                 3.4080 
                 3.9020 
                 3.9020 
               
               
                   
                 Overall length of 
                 91.8364 
                 121.4421 
                 161.9891 
               
               
                   
                 lens system 
               
               
                   
                 BF 
                 1.18296 
                 1.18464 
                 1.11143 
               
               
                   
                 d7 
                 0.7000 
                 43.4264 
                 68.2003 
               
               
                   
                 d14 
                 38.0000 
                 9.6915 
                 1.5000 
               
               
                   
                 d22 
                 1.8000 
                 20.9317 
                 15.1409 
               
               
                   
                 d24 
                 4.0000 
                 5.0000 
                 36.3686 
               
               
                   
                 d26 
                 7.4855 
                 2.5400 
                 1.0000 
               
               
                   
                   
               
             
          
           
               
                 Zoom lens unit data 
               
             
          
           
               
                 Lens unit 
                 Initial surface No. 
                 Focal length 
               
               
                   
               
               
                 1 
                 1 
                 90.80748 
               
               
                 2 
                 8 
                 −8.75022 
               
               
                 3 
                 15 
                 16.89083 
               
               
                 4 
                 23 
                 −31.04187 
               
               
                 5 
                 25 
                 18.91322 
               
               
                   
               
             
          
         
       
     
       Numerical Example 5 
       [0185]    The zoom lens system of Numerical Example 5 corresponds to Embodiment 5 shown in  FIG. 13 . Table 13 shows the surface data of the zoom lens system of Numerical Example 5. Table 14 shows aspherical data. Table 15 shows various data in infinity in-focus condition. 
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
               
               
               
               
             
           
               
                 TABLE 13 
               
             
             
               
                   
               
               
                 (surface data) 
               
             
          
           
               
                 Surface number 
                 r 
                 d 
                 nd 
                 vd 
               
               
                   
               
             
          
           
               
                 Object surface 
                 ∞ 
                   
                   
                   
               
               
                  1 
                 101.74870 
                 1.70000 
                 1.80610 
                 33.3 
               
               
                  2 
                 50.33300 
                 4.74560 
                 1.49700 
                 81.6 
               
               
                  3 
                 −605.39680 
                 0.20000 
               
               
                  4 
                 46.61920 
                 3.45190 
                 1.59282 
                 68.6 
               
               
                  5 
                 150.18640 
                 Variable 
               
               
                  6 
                 67.97700 
                 1.00000 
                 1.80420 
                 46.5 
               
               
                  7 
                 8.22480 
                 5.32150 
               
               
                  8 
                 −17.48260 
                 0.70000 
                 1.80420 
                 46.5 
               
               
                  9 
                 44.76360 
                 0.20000 
               
               
                 10 
                 23.22590 
                 1.87950 
                 1.94595 
                 18.0 
               
               
                 11 
                 −191.03070 
                 Variable 
               
               
                 12(Diaphragm) 
                 ∞ 
                 0.50000 
               
               
                 13* 
                 10.44370 
                 2.88840 
                 1.60602 
                 57.4 
               
               
                 14* 
                 −29.91320 
                 1.37480 
               
               
                 15 
                 −487.23250 
                 1.41220 
                 1.49700 
                 81.6 
               
               
                 16 
                 −30.82980 
                 0.50000 
                 1.80610 
                 33.3 
               
               
                 17 
                 11.02100 
                 0.79690 
               
               
                 18 
                 17.94940 
                 2.61400 
                 1.49700 
                 81.6 
               
               
                 19 
                 −11.58640 
                 Variable 
               
               
                 20 
                 −75.02180 
                 1.00000 
                 1.49700 
                 81.6 
               
               
                 21 
                 15.80850 
                 Variable 
               
               
                 22* 
                 20.02920 
                 2.03640 
                 1.54410 
                 56.1 
               
               
                 23* 
                 −27.45430 
                 Variable 
               
               
                 24 
                 ∞ 
                 1.00000 
                 1.51680 
                 64.2 
               
               
                 25 
                 ∞ 
                 (BF) 
               
               
                 Image surface 
                 ∞ 
               
               
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
             
           
               
                 TABLE 14 
               
               
                   
               
               
                 (Aspherical data) 
               
               
                   
               
             
             
               
                   
               
             
          
           
               
                   
                 Surface No. 13 
               
               
                   
                 K = −1.60976E+00, A4 = 1.04725E−04, A6 = 2.12223E−07, 
               
               
                   
                 A8 = 1.45232E−08 A10 = −1.24938E−09 
               
               
                   
                 Surface No. 14 
               
               
                   
                 K = 0.00000E+00, A4 = 1.42668E−04, A6 = −5.82692E−08, 
               
               
                   
                 A8 = −9.34423E−09 A10 = −1.01070E−09 
               
               
                   
                 Surface No. 22 
               
               
                   
                 K = 0.00000E+00, A4 = −1.44465E−04, A6 = −7.23537E−06, 
               
               
                   
                 A8 = 1.18316E−06 A10 = −2.43212E−08 
               
               
                   
                 Surface No. 23 
               
               
                   
                 K = 0.00000E+00, A4 = −1.02402E−04, A6 = −1.34449E−05, 
               
               
                   
                 A8 = 1.85128E−06 A10 = −3.97456E−08 
               
               
                   
                   
               
             
          
         
       
     
         [0000]    
       
         
               
             
               
               
               
               
               
             
               
             
               
               
               
             
           
               
                 TABLE 15 
               
               
                   
               
               
                 (Various data in infinity in-focus condition) 
               
               
                   
               
             
             
               
                 Zooming ratio 46.49462 
               
             
          
           
               
                   
                   
                 Wide-angle 
                 Middle 
                 Telephoto 
               
               
                   
                   
                 limit 
                 position 
                 limit 
               
               
                   
                   
               
               
                   
                 Focal length 
                 4.4500 
                 30.3448 
                 206.9017 
               
               
                   
                 F-number 
                 2.90073 
                 4.76104 
                 6.09964 
               
               
                   
                 Half view angle 
                 41.9908 
                 7.1947 
                 1.0634 
               
               
                   
                 Image height 
                 3.4080 
                 3.9020 
                 3.9020 
               
               
                   
                 Overall length of 
                 87.7865 
                 108.5451 
                 144.6492 
               
               
                   
                 lens system 
               
               
                   
                 BF 
                 1.17818 
                 1.21026 
                 1.12781 
               
               
                   
                 d5 
                 0.7000 
                 38.0000 
                 65.1258 
               
               
                   
                 d11 
                 38.0000 
                 9.1383 
                 1.5000 
               
               
                   
                 d19 
                 4.0137 
                 19.7354 
                 11.5740 
               
               
                   
                 d21 
                 4.0000 
                 5.0000 
                 29.4323 
               
               
                   
                 d23 
                 6.5734 
                 2.1399 
                 2.5681 
               
               
                   
                   
               
             
          
           
               
                 Zoom lens unit data 
               
             
          
           
               
                 Lens unit 
                 Initial surface No. 
                 Focal length 
               
               
                   
               
               
                 1 
                 1 
                 87.60252 
               
               
                 2 
                 6 
                 −9.26364 
               
               
                 3 
                 12 
                 15.94498 
               
               
                 4 
                 20 
                 −26.17634 
               
               
                 5 
                 22 
                 21.61055 
               
               
                   
               
             
          
         
       
     
         [0186]    The following Table 16 shows the corresponding values to the individual conditions in the zoom lens systems of each of Numerical Examples. 
         [0000]    
       
         
               
             
               
               
               
             
               
               
               
               
               
               
               
             
               
               
               
               
               
               
               
             
           
               
                 TABLE 16 
               
             
             
               
                   
               
               
                 (Values corresponding to conditions) 
               
             
          
           
               
                   
                 Numerical Example 
                   
               
             
          
           
               
                   
                 Condition 
                 1 
                 2 
                 3 
                 4 
                 5 
               
               
                   
               
             
          
           
               
                 (1) 
                 f G1 /f W   
                 22.56 
                 23.67 
                 24.59 
                 24.54 
                 19.69 
               
               
                 (2) 
                 m 6T /m 6W   
                 1.35 
                 1.52 
                 1.61 
                 — 
                 — 
               
               
                 (3) 
                 m 5T /m 5W   
                 — 
                 — 
                 — 
                  1.77 
                  1.33 
               
               
                   
               
             
          
         
       
     
         [0187]    The present disclosure is applicable to digital input devices such as a digital camera, a camera of a portable information terminal such as a smart phone, a camera of a personal digital assistance (PDA), a monitor camera of a monitor system, a Web camera, a vehicle-mounted camera, and the like. In particular, the present disclosure is applicable to a photographing optical system in which high image quality is required like in a digital camera. 
         [0188]    As presented above, embodiments have been described as examples of the technology according to the present disclosure. For this purpose, the accompanying drawings and the detailed description are provided. 
         [0189]    Therefore, components in the accompanying drawings and the detail description may include not only components essential for solving problems, but also components that are provided to illustrate the above described technology and are not essential for solving problems. Therefore, such inessential components should not be readily construed as being essential based on the fact that such inessential components are shown in the accompanying drawings or mentioned in the detailed description. 
         [0190]    Further, the above described embodiments have been described to exemplify the technology according to the present disclosure, and therefore, various modifications, replacements, additions, and omissions may be made within the scope of the claims and the scope of the equivalents thereof.