Zoom lens and image capturing device having the same

Abstract

To provide a zoom lens which offers a high zoom ratio and high optical performance and can be easily adapted to be compatible with electrical zooming.SOLUTION: A zoom lens provided herein consists of a first lens group L1 having negative refractive power, an intermediate group LM comprising one or more lens groups and having positive refractive power as a whole, and a succeeding group LR comprising a fixed lens group Ls having negative refractive power and three or more lens groups, all arranged in order from the object side to the image side, and is configured such that a distance between each pair of adjacent lens groups changes while zooming, where the first lens group L1 and the fixed lens group Ls are stationary while zooming. The intermediate group LM or at least a portion of the succeeding group LR moves while focusing. The first lens group L1 includes at least one negative lens and at least one positive lens. A lateral magnification of the intermediate group LM at the wide-angle end, a lateral magnification of the intermediate group LM at the telephoto end, a focal length of the entire zoom lens at the wide-angle end, a focal length of the entire zoom lens at the telephoto end and the like are set appropriately.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a zoom lens, and is suitable for digital video cameras, digital still cameras, broadcast cameras, silver halide film cameras, surveillance cameras, and the like.

[0002] In particular, the present invention relates to a zoom lens that is highly compatible with applications such as video shooting, while reducing the size and weight of the lens of the moving group during zooming and having high optical performance.

Background Art

[0003] In recent years, due to being suitable for video shooting and the like, a zoom lens compatible with an electric zoom function has been desired.

[0004] Patent Document 1 discloses a negative lead type zoom lens that achieves both a high zoom ratio and high optical performance by moving each lens group during zooming.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] In a zoom lens, the moving group is preferably small and light in weight, and the amount of movement of the moving group is small. The zoom lens of Patent Document 1 moves a heavy lens group such as the first lens group during zooming. Since a heavy lens group is moved, it becomes difficult to cope with an electric zoom.

[0007] An object of the present invention is to provide a zoom lens having a high zoom ratio and high optical performance and being easily compatible with an electric zoom.

Means for Solving the Problems

[0008] In one aspect of the present invention, the zoom lens L0 includes, in order from the object side to the image side, a first lens group having a negative refractive power, an intermediate group including one or more lens groups and having a positive refractive power as a whole, a fixed lens group having a negative refractive power, and a subsequent group including three or more lens groups, and is a zoom lens in which the intervals between adjacent lens groups change during zooming. During zooming, the first lens group and the fixed lens group are stationary, and at least a part of the intermediate group or the subsequent group moves during focusing. The first lens group includes at least one negative lens and at least one positive lens. When the lateral magnification at the wide-angle end of the intermediate group is βMw, the lateral magnification at the telephoto end of the intermediate group is βMt, the overall focal length at the wide-angle end of the zoom lens is fw, and the overall focal length at the telephoto end of the zoom lens is ft, 0.60 ≦ (βMt / βMw) / (ft / fw) ≦ 4.00 1.65 ≦ ft / fw ≦ 6.00 It is characterized by satisfying the following conditional expressions.

[0009] In one aspect of the present invention, the zoom lens L0 includes, in order from the object side to the image side, a first lens group having a negative refractive power, an intermediate group including one or more lens groups and having a positive refractive power as a whole, a fixed lens group having a negative refractive power, and a subsequent group including one or more lens groups, and has five or more lens groups in total. It is a zoom lens in which the intervals between adjacent lens groups change during zooming. During zooming, the first lens group and the fixed lens group are stationary, and at least a part of the subsequent group moves during focusing. The first lens group includes at least one negative lens and at least one positive lens. When the lateral magnification at the wide-angle end of the intermediate group is βMw, the lateral magnification at the telephoto end of the intermediate group is βMt, the overall focal length at the wide-angle end of the zoom lens is fw, the overall focal length at the telephoto end of the zoom lens is ft, and the distance on the optical axis from the vertex of the lens surface on the most object side of the first lens group to the vertex of the lens surface on the most image side of the first lens group is D1, and the distance on the optical axis from the vertex of the lens surface on the most object side of the zoom lens at the wide-angle end to the vertex of the lens surface on the most image side of the zoom lens is TLw, 0.60 ≦ (βMt / βMw) / (ft / fw) ≦ 4.00 2.00 ≦ ft / fw ≦ 6.00 0.04 ≦ D1 / TLw ≦ 0.25 It is characterized by satisfying the following conditional expressions.

Advantages of the Invention

[0010] According to the present invention, it is possible to provide a zoom lens having a high magnification ratio and high optical performance and being easily adaptable to an electric zoom.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Figure 14

Figure 15

Figure 16

Figure 17

Figure 18

Figure 19

Figure 20

Figure 21

Figure 22

Figure 23

Figure 24

Figure 25

Figure 26

Figure 27

Figure 28

Figure 29

Figure 30

Figure 31

Best Mode for Carrying Out the Invention

[0012] Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. Note that each drawing may be drawn at a scale different from the actual one for convenience. Also, in each drawing, the same members are denoted by the same reference numerals, and redundant explanations are omitted.

[0013] Figures 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, and 29 are cross-sectional views of the zoom lenses of Examples 1 to 15, respectively. In each figure, the left side is the object side (front side), and the right side is the image side (rear side). The zoom lens L0 according to each embodiment is configured to have a plurality of lens groups, and the intervals between adjacent lens groups change during zooming. Note that a lens group may be composed of one lens or a plurality of lenses. Also, the focusing group composed of one or more lenses that move during focusing may be the above-described lens group, or a part of the lens group may move.

[0014] In each figure, Li is the i-th lens group (where i is a natural number) counted in order from the object side to the image side among the lens groups included in the zoom lens L0. Also, LM is an intermediate group having one or more lens groups, and Lmi is the i-th lens group (where i is a natural number) counted in order from the object side to the image side among the lens groups included in the intermediate group LM. Further, LR is a subsequent group having one or more lens groups, and Lri is the i-th lens group (where i is a natural number) counted in order from the object side to the image side among the lens groups included in the subsequent group LR.

[0015] Also, in each figure, SP represents an aperture stop that determines the light beam of the aperture F-number (Fno), and IP represents the image plane. When the zoom lens L0 of each embodiment is used as an imaging optical system for a digital video camera or a digital still camera, the imaging surface of a solid-state imaging device (photoelectric conversion device) is disposed on the image plane IP. As the solid-state imaging device, a CCD (Charge Coupled Device) sensor, a CMOS (Complementary Metal Oxide Semiconductor) sensor, or the like can be used. When the zoom lens L0 of each embodiment is used as an imaging optical system for a camera for silver halide film, the photosensitive surface of the film is disposed on the image plane IP.

[0016] Note that the zoom lens of each embodiment may be used as a projection lens for a projector or the like. In this case, the left side is the screen side, and the right side is the side of the image to be projected.

[0017] In each figure, each solid line arrow indicates the locus of movement of each lens group during zooming from the wide-angle end to the telephoto end, and a solid line arrow is attached below the lens group that moves in the optical axis direction during zooming. Also, during image blur correction, the anti-shake group moves as indicated by the vertical arrows.

[0018] In each figure, each dashed line arrow indicates the locus of movement of each group during focusing from infinity to the short distance (closest end), and a dashed line arrow is shown below the group that moves during focusing.

[0019] Figures 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, and 30 are aberration diagrams when focused at an infinite object distance at the wide-angle end of the zoom lenses of Examples 1 to 15, respectively.

[0020] In each figure, Fno is the F-number, and ω indicates the imaging semi-field angle (°) obtained by paraxial calculation. In the spherical aberration diagram, the solid line represents the spherical aberration at the d-line (wavelength 587.56 nm), and the two-dot chain line represents the spherical aberration at the g-line (wavelength 435.835 nm). In the astigmatism diagram, the solid line represents the astigmatism at the d-line in the sagittal image plane, and the dashed line represents the astigmatism at the d-line in the meridional image plane. The distortion diagram shows the distortion at the d-line. The chromatic aberration diagram shows the longitudinal chromatic aberration at the g-line.

[0021] Next, the characteristic configurations of the zoom lens L0 of each example will be described.

[0022] In the zoom lens L0 of each example, the first lens group L1 is stationary with respect to the image plane IP during zooming. Since the lenses included in the first lens group L1 have a large outer diameter, they tend to be heavy. Therefore, by making the first lens group L1 stationary during zooming, rapid and silent zooming can be realized. Furthermore, by making the first lens group L1 stationary with respect to the image plane IP during zooming, the tilting of the first lens group L1 that occurs during zooming can be suppressed.

[0023] In the zoom lens L0 of each embodiment, when zooming from the wide-angle end to the telephoto end, the first intermediate lens group Lm1 and the first subsequent lens group Lr1 move toward the object side, and the fixed lens group Ls is stationary with respect to the image plane IP. By moving the first intermediate lens group Lm1 and the first subsequent lens group Lr1, each having a positive refractive power, toward the object side so as to approach the first lens group L1 and the fixed lens group Ls, each having a negative refractive power, respectively, a variable magnification function is realized. Further, by arranging the fixed lens group Ls that is stationary during zooming, the amount of movement of the first intermediate lens group Lm1 and the first subsequent lens group Lr1 during high magnification can be reduced.

[0024] In the zoom lens L0 of each embodiment, the first lens group includes at least one negative lens and at least one positive lens. By favorably correcting off-axis aberrations such as chromatic aberration and field curvature in the first lens group L1 that is stationary during zooming, the number of lenses required for aberration correction in the intermediate group LM and the subsequent group LR that move during zooming is reduced. As a result, it contributes to the miniaturization and weight reduction of the lens group that moves during zooming.

[0025] The zoom lens according to the first embodiment is configured to satisfy the following conditional expressions.

[0026] Here, let the lateral magnification at the wide-angle end of the intermediate group LM be βMw, the lateral magnification at the telephoto end of the intermediate group LM be βMt, the focal length of the entire system at the wide-angle end of the zoom lens L0 be fw, and the focal length of the entire system at the telephoto end of the zoom lens L0 be ft. At this time, the zoom lens L0 satisfies 0.60 ≦ (βMt / βMw) / (ft / fw) ≦ 4.00 (1-1) 1.65 ≦ ft / fw ≦ 6.00 (2-1) the conditional expressions.

[0027] The zoom lens according to the second embodiment is configured to satisfy the following conditional expressions.

[0028] Here, let the lateral magnification at the wide-angle end of the intermediate group LM be βMw, the lateral magnification at the telephoto end of the intermediate group LM be βMt, the overall focal length of the entire zoom lens L0 at the wide-angle end be fw, and the overall focal length of the entire zoom lens L0 at the telephoto end be ft. Also, let the distance on the optical axis from the vertex of the lens surface closest to the object side of the first lens group L1 to the vertex of the lens surface closest to the image side of the first lens group L1 be D1. Further, let the distance on the optical axis from the vertex of the lens surface closest to the object side of the zoom lens L0 at the wide-angle end to the vertex of the lens surface closest to the image side of the zoom lens L0 be TLw. At this time, the zoom lens L0 satisfies 0.60 ≦ (βMt / βMw) / (ft / fw) ≦ 4.00 (1-2) 2.00 ≦ ft / fw ≦ 6.00 (2-2) 0.04 ≦ D1 / TLw ≦ 0.25 (3) the following conditional expressions.

[0029] Here, the technical significance of the above conditional expressions will be explained.

[0030] Conditional expressions (1-1) and (1-2) are conditional expressions that define the zoom sharing ratio of the intermediate group LM among the zoom ratios of the zoom lens L0. In a zoom lens having a plurality of lens groups that move during zooming, it becomes important how much of the zoom ratio of the entire zoom lens is shared by which lens group. By satisfying conditional expression (1-1) or (1-2), the movement amounts and aberration corrections of each lens group that move during zooming can be appropriately shared. As a result, it is possible to achieve a small and lightweight zoom lens with a high zoom ratio and high optical performance.

[0031] In addition, when the intermediate group LM is composed of a plurality of lens groups, βMw and βMt shall be the combined lateral magnification of the entire intermediate group LM. If the upper limit value of the conditional expression (1-1) or (1-2) is exceeded, the zoom sharing ratio of the intermediate group becomes too high, so the movement amount of the intermediate group LM increases and the overall length becomes large, or it becomes difficult to ensure a high zoom ratio. If it is below the lower limit value of the conditional expression (1-1) or (1-2), it becomes difficult to ensure a high zoom ratio, or the other lens groups have to bear a large part of the zooming and the overall length tends to increase.

[0032] The conditional expressions (2-1) and (2-2) are the conditional expressions that define the zoom ratio of the zoom lens L0. For lenses with a low zoom ratio, the zoom sharing ratio can be set freely to some extent, but for lenses with a high zoom ratio, it is necessary to appropriately set the arrangement of the lens groups. If the upper limit value of the conditional expressions (2-1) and (2-2) is exceeded, it becomes difficult to suppress the zoom variation of the aberration performance over the entire zoom range due to the excessive increase in the zoom ratio. If it is below the lower limit value of the conditional expressions (2-1) and (2-2), it becomes difficult to achieve a high zoom ratio.

[0033] The conditional expression (3) is the conditional expression that defines the thickness of the first lens group L1 with respect to the overall length of the zoom lens L0. If the upper limit value of the conditional expression (3) is exceeded, it becomes difficult to sufficiently secure the space for obtaining the movement amount of the moving group necessary for high zooming due to the enlargement of the first lens group L1. If it is below the lower limit value of the conditional expression (3), it becomes difficult to arrange the lenses for correcting the aberration generated within the first lens group L1, or the overall length of the zoom lens L0 becomes too large.

[0034] With the above configuration, a zoom lens having a high zoom ratio and high optical performance and being easily adaptable to an electric zoom can be realized.

[0035] Also, it is more preferable that the zoom lens according to the first embodiment satisfies the numerical ranges of the conditional expressions (1-1) and (2-1) with the following conditional expressions (1-1a) and (2-1a). 0.63≦(βMt / βMw) / (ft / fw)≦3.50 (1-1a) 1.70 ≦ ft / fw ≦ 5.50 (2-1a)

[0036] Furthermore, for the zoom lens according to the first embodiment, it is more preferable to satisfy the numerical ranges of conditional expressions (1-1a) and (2-1a) with the following conditional expressions (1-1b) and (2-1b). 0.65 ≦ (βMt / βMw) / (ft / fw) ≦ 3.00 (1-1b) 1.65 ≦ ft / fw ≦ 5.00 (2-1b)

[0037] Also, for the zoom lens according to the second embodiment, it is more preferable to satisfy the numerical ranges of conditional expressions (1-2), (2-2), and (3) with the following conditional expressions (1-2a), (2-2a), and (3a). 0.63 ≦ (βMt / βMw) / (ft / fw) ≦ 3.50 (1-2a) 2.02 ≦ ft / fw ≦ 5.50 (2-2a) 0.07 ≦ D1 / TLw ≦ 0.20 (3a)

[0038] Furthermore, for the zoom lens according to the first embodiment, it is more preferable to satisfy the numerical ranges of conditional expressions (1-2a) and (2-2a) with the following conditional expressions (1-2b), (2-2b), and (3b). 0.65 ≦ (βMt / βMw) / (ft / fw) ≦ 3.00 (1-2b) 2.10 ≦ ft / fw ≦ 5.00 (2-2b) 0.10 ≦ D1 / TLw ≦ 0.17 (3b)

[0039] In addition to conditional expressions (1-1a) and (2-1a), it is more preferable for the zoom lens according to the first embodiment to satisfy conditional expression (3). Even in the zoom lens according to the first embodiment, by satisfying conditional expression (3), the above-described effects can be achieved.

[0040] Furthermore, it is preferable that the zoom lens L0 of each example satisfies one or more of the following conditional expressions. 0.99 ≦ (βMt / βMw) ≦ 20.00 (4) 0.30 ≦ |βr1t / βr1w| / (ft / fw) ≦ 40.00 (5) 0.83 ≦ (-f1) / fw ≦ 5.00 (6) 0.48 ≦ (-f1) / fMt ≦ 1.27 (7) 0.10 ≦ (-f1) / (-fs) ≦ 2.00 (8) -3.00 ≦ (-f1) / fF ≦ 1.00 (9) 0.005 ≦ (-f1) / |fL| ≦ 2.00 (10) 0.10 ≦ Dm / D1 ≦ 0.60 (11) 0.70 ≦ |Mm1| / |Mr1| ≦ 2.50 (12) 0.09 ≦ │Mma│ / TLw ≦ 0.27 (13) 0.06 ≦ │Mra│ / TLw ≦ 0.25 (14) 0.10 ≦ |fr1| / |fr2| ≦ 10.00 (15)

[0041] Here, let the lateral magnification at the wide-angle end of the first subsequent lens group Lr1, which is the lens group closest to the object side among the subsequent lens groups, be βr1w, and the lateral magnification at the telephoto end of the first subsequent lens group Lr1 be βr1t. Let the focal length of the first lens group L1 be f1, the combined focal length at the telephoto end of the entire lenses constituting the intermediate group LM be fMt, and the focal length of the fixed lens group Ls be fs. Also, let the focal length of the focusing group that moves during focusing be fF, and the focal length of the lens group arranged closest to the image side among the subsequent lens groups LR be fL. Let Dm be the largest air interval among the surface intervals on the optical axis in the lenses arranged in the first lens group.

[0042] Also, let Mm1 be the moving amount when zooming from the wide-angle end to the telephoto end of the first intermediate lens group Lm1, which is the lens group closest to the object side among the intermediate groups LM. Let Mr1 be the moving amount when zooming from the wide-angle end to the telephoto end of the first subsequent lens group Lr1. Let Mma be the moving amount of the lens group with the largest moving amount when zooming from the wide-angle end to the telephoto end among the lens groups constituting the intermediate group LM, and let Mra be the moving amount of the lens group with the largest moving amount when zooming from the wide-angle end to the telephoto end among the lens groups constituting the subsequent group LR. Let fr1 be the focal length of the first subsequent lens group Lr1, and let fr2 be the focal length of the second subsequent lens group Lr2.

[0043] Note that the moving amount of the lens group in this embodiment is the difference in the positions on the optical axis of the lens group at the wide-angle end and the telephoto end, and the sign of the moving amount is positive when the lens group is located on the image side at the telephoto end compared to the wide-angle end.

[0044] The conditional expression (4) is a conditional expression that defines the zoom ratio of the intermediate group LM. In order to realize a small and high-zoom-ratio zoom lens, it is necessary to appropriately set the zoom ratio of the intermediate group LM arranged on the object side of the fixed lens group Ls with negative refractive power. When the intermediate group LM is composed of a plurality of lens groups, βMw and βMt are the combined lateral magnifications of the entire intermediate group LM. If the upper limit value of the conditional expression (4) is exceeded, the zoom ratio of the intermediate group LM becomes too high, so the moving amount of the intermediate group LM increases and the overall length becomes large, or it becomes difficult to ensure a high zoom ratio. On the other hand, if it is below the lower limit value of the conditional expression (4), it becomes difficult to ensure a high zoom ratio, or other lens groups have to bear a large part of the zooming and the overall length becomes large.

[0045] Furthermore, it is more preferable that βMw in the conditional expression (4) satisfies the following conditional expression. -1.70 ≦ βMw ≦ -0.65 (16)

[0046] Conditional expression (16) is a conditional expression that defines the lateral magnification at the wide-angle end of the intermediate group LM. In order to achieve high zooming while making the lens small and lightweight, it is preferable to increase the absolute value of the lateral magnification at the wide-angle end. By adopting such a configuration, even when a high zoom ratio is achieved with the intermediate group LM, it is possible to reduce the movement amount of each group of the intermediate group LM. If the upper limit value of conditional expression (16) is exceeded, the absolute value of the lateral magnification at the wide-angle end of the intermediate group LM becomes too small, resulting in a large movement amount when achieving a high zoom ratio. On the other hand, if it is below the lower limit value of conditional expression (16), the aberration variation due to zooming becomes too large.

[0047] Conditional expression (5) is a conditional expression that defines the zoom ratio of the first subsequent lens group Lr1. For a small and high-zoom-ratio zoom lens, it is necessary to appropriately set the zoom ratio of the subsequent lens group Lr1 arranged on the image side with respect to the fixed lens group Ls having a negative refractive power. If the upper limit value of conditional expression (5) is exceeded, the zoom ratio of the first subsequent lens group Lr1 becomes too high, so the movement amount of the first subsequent lens group Lr1 increases and the overall length becomes large, or it becomes difficult to ensure a high zoom ratio. On the other hand, if it is below the lower limit value of conditional expression (5), it becomes difficult to ensure a high zoom ratio, or the other lens groups have to bear a large amount of zooming and the overall length becomes large.

[0048] Conditional expression (6) is a conditional expression that defines the ratio of the focal length f1 of the first lens group L1 to the overall focal length fw of the entire zoom lens L0 at the wide-angle end. If the upper limit value of conditional expression (6) is exceeded, the power of the first lens group L1 becomes too weak, and the front lens becomes large during wide-angle conversion, resulting in an increase in the size of the zoom lens L0. On the other hand, if it is below the lower limit value of conditional expression (6), the power of the first lens group L1 becomes too strong, making it difficult to correct the aberration generated in the first lens group L1 during wide-angle conversion.

[0049] The conditional expression (7) is a conditional expression that defines the ratio between the focal length f1 of the first lens group L1 and the combined focal length fMt at the telephoto end of the intermediate group LM. If the upper limit value of the conditional expression (7) is exceeded, the power of the intermediate group LM becomes too strong, making it difficult to achieve good correction of axial aberrations such as spherical aberration. On the other hand, if it is below the lower limit value of the conditional expression (7), the power of the first lens group L1 becomes too strong, making it difficult to achieve good correction of off-axis aberrations such as field curvature.

[0050] The conditional expression (8) is a conditional expression that defines the ratio between the focal length of the first lens group L1 and the focal length of the fixed lens group Ls. On the other hand, if the upper limit value of the conditional expression (8) is exceeded, the power of the fixed lens group Ls becomes too strong, making it difficult to achieve good correction of axial aberrations such as spherical aberration. If it is below the lower limit value of the conditional expression (8), the power of the fixed lens group Ls becomes too weak, making it difficult to achieve the desired magnification ratio.

[0051] The conditional expression (9) is a conditional expression that defines the ratio between the focal length of the first lens group L1 and the focal length fF of the focusing group that moves during focusing. When there are multiple lens groups that move during focusing, the above conditional expression uses the multiple lens groups that move during focusing within the subsequent group as the focusing group. If the upper limit value of the conditional expression (9) is exceeded, the power of the focusing group becomes too strong, making it difficult to achieve good correction of axial aberrations such as spherical aberration during close-focusing. On the other hand, if it is below the lower limit value of the conditional expression (9), the power of the fixed lens group Ls becomes too weak, increasing the amount of movement during focusing and making miniaturization difficult.

[0052] The conditional expression (10) is a conditional expression that defines the ratio between the focal length of the first lens group L1 and the focal length fL of the most image-side lens group in the subsequent group LR. If the upper limit value of the conditional expression (10) is exceeded, the power of the most image-side lens group in the subsequent group LR becomes too strong, making it difficult to achieve good correction of axial aberrations such as spherical aberration. On the other hand, if it is below the lower limit value of the conditional expression (10), the power of the first lens group L1 becomes too strong, making it difficult to achieve good correction of off-axis aberrations such as field curvature.

[0053] The conditional expression (11) is a conditional expression that defines the ratio of the thickness of the first lens group L1 to the maximum air interval within the first lens group L1. If the upper limit value of the conditional expression (11) is exceeded, the first lens group L1 becomes too large, causing the zoom lens L0 to become larger. On the other hand, if it is below the lower limit value of the conditional expression (11), in the lenses arranged in the first lens group L1, the interval between the lenses necessary for aberration correction generated in the first lens group L1 cannot be secured sufficiently.

[0054] The conditional expression (12) is a conditional expression that defines the movement amount of the first intermediate lens group Lm1 and the movement amount of the first subsequent lens group Lr1. In order to reduce the overall length of the zoom lens, it is necessary to appropriately set the movement amount of each lens group. If the upper limit value of the conditional expression (12) is exceeded, the movement amount of the first intermediate lens group Lm1 becomes too large, increasing the overall length of the zoom lens. On the other hand, if it is below the lower limit value of the conditional expression (12), the movement amount of the first subsequent lens group Lr1 becomes too large, increasing the overall length of the zoom lens.

[0055] The conditional expression (13) is a conditional expression that defines the movement amount of the lens groups constituting the intermediate group LM with respect to the overall lens length. If the upper limit value of the conditional expression (13) is exceeded, the movement amount becomes too large, increasing the overall length of the zoom lens. On the other hand, if it is below the lower limit value of the conditional expression (13), the movement amount becomes too small, making it difficult to achieve the desired magnification ratio.

[0056] The conditional expression (14) is a conditional expression that defines the movement amount of the lens groups constituting the subsequent group LR with respect to the overall lens length. If the upper limit value of the conditional expression (14) is exceeded, the movement amount becomes too large, increasing the overall length of the zoom lens. On the other hand, if it is below the lower limit value of the conditional expression (14), the movement amount becomes too small, making it difficult to achieve the desired magnification ratio.

[0057] The conditional expression (15) is a conditional expression that defines the ratio of the focal length of the first subsequent lens group Lr1 to the focal length of the second subsequent lens group Lr2. If it exceeds the upper limit value of the conditional expression (15), the power of the second subsequent lens group Lr2 becomes too strong, making it difficult to correct off-axis aberrations such as field curvature. On the other hand, if it is below the lower limit value of the conditional expression (15), the power of the first subsequent lens group Lr1 becomes too strong, making it difficult to correct on-axis aberrations such as spherical aberration at the telephoto end and off-axis aberrations such as field curvature at the wide-angle end.

[0058] It is preferable to satisfy the following conditional expressions (4a) to (15a). 1.10 ≦ (βMt / βMw) ≦ 15.00 (4a) 0.35 ≦ |βr1t / βr1w| / (ft / fw) ≦ 15.00 (5a) 0.94 ≦ (-f1) / fw ≦ 4.00 (6a) 0.54 ≦ (-f1) / fMt ≦ 1.17 (7a) 0.15 ≦ (-f1) / (-fs) ≦ 1.95 (8a) -2.90 ≦ (-f1) / fF ≦ 0.50 (9a) 0.008 ≦ (-f1) / |fL| ≦ 1.800 (10a) 0.15 ≦ Dm / D1 ≦ 0.55 (11a) 0.72 ≦ |Mm1| / |Mr1| ≦ 2.45 (12a) 0.10 ≦ │Mma│ / TLw ≦ 0.25 (13a) 0.06 ≦ │Mra│ / TLw ≦ 0.22 (14a) 0.20 ≦ |fr1| / |fr2| ≦ 1.36 (15a)

[0059] Furthermore, it is more preferable to satisfy the following conditional expressions (4b) to (15b). 1.20 ≦ (βMt / βMw) ≦ 10.00 (4b) 0.38 ≦ |βr1t / βr1w| / (ft / fw) ≦ 7.00 (5b) 0.99 ≦ (-f1) / fw ≦ 3.50 (6b) 0.57 ≦ (-f1) / fMt ≦ 1.08 (7b) 0.20 ≤ (-f1) / (-fs) ≤ 1.90 (8b) -3.00 ≤ (-f1) / fF ≤ -0.30 (9b) 0.010 ≤ (-f1) / |fL| ≤ 1.600 (10b) 0.20 ≤ Dm / D1 ≤ 0.50 (11b) 0.74 ≤ |Mm1| / |Mr1| ≤ 2.40 (12b) 0.11 ≤ │Mma│ / TLw ≤ 0.24 (13b) 0.07 ≤ │Mra│ / TLw ≤ 0.20 (14b) 0.71 ≤ |fr1| / |fr2| ≤ 1.25 (15b)

[0060] Next, the preferable conditions satisfied by the zoom lens L0 of each example will be described.

[0061] In the zoom lens L0 of each example, it is preferable that the fixed lens group Ls with negative refractive power includes the aperture stop SP. With such a configuration, the moving groups such as the first intermediate lens group Lm1 and the first subsequent lens group Lr1 arranged near the aperture stop SP are reduced in size and weight. As a result, while reducing the load on the actuator used for the movement of the lens group that moves during zooming, good aberration performance is realized over the entire zoom range with a high magnification ratio. In addition, in order to more effectively suppress zoom fluctuations such as spherical aberration and field curvature, it is preferable that the intermediate group LM and the subsequent group LR are each composed of a plurality of lens groups. At this time, the intermediate group LM only needs to be positive as a whole, and may be configured to include a negative lens group.

[0062] In the zoom lens L0 of each example, in order to achieve both a small and high-magnification zoom lens and good aberration correction, the subsequent group LR has three or more lens groups, or the entire system has five or more lens groups. Since the plurality of lens groups have a variable magnification function, it is possible to achieve both miniaturization and good aberration correction by appropriately sharing aberration correction among the lens groups while increasing the magnification. More preferably, it is desirable that the number of lens groups that move during zooming is three or more.

[0063] In the zoom lens L0 of each embodiment, it is preferable that the focusing group that moves during focusing is composed of the lens group that constitutes the intermediate group LM or the subsequent group LR, or a part of the lens group. By using a small and lightweight moving group or a part thereof as the focusing group, the load on the actuator can be reduced, so that quick and silent focusing can be realized. Further, it is more preferable to move a part of the subsequent group LR during focusing. By using a part of the small subsequent group LR as the focusing group, quicker and silent focusing can be realized. Furthermore, it is desirable that the focusing group has a negative refractive power. By focusing with the focusing group having a negative refractive power included in the small and high-refractive-power subsequent group LR, the above-described effects can be further enhanced.

[0064] In the zoom lens L0 of each embodiment, it is preferable that one positive lens arranged in the first lens group L1 is arranged on the image side most within the first lens group L1. By adopting such a configuration, chromatic aberration can be corrected well. Further, it is preferable that the lens arranged on the object side most in the first lens group L1 is a negative meniscus lens with the convex surface facing the object side. By adopting such a configuration, off-axis aberration can be corrected well while achieving wide-angle conversion.

[0065] In the zoom lens L0 of each embodiment, it is preferable that the first subsequent lens group Lr1 includes at least one aspherical lens. By adopting such a configuration, while reducing the overall length of the zoom lens L0, off-axis aberration generated at the wide-angle end can be corrected well.

[0066] In the zoom lens L0 of each embodiment, it is preferable that a lens group with negative refractive power is arranged adjacent to the image side of the first subsequent lens group Lr1. By adopting a telephoto type arrangement with the first subsequent lens group Lr1 having positive refractive power and the lens group with negative refractive power, the overall length of the zoom lens can be shortened and miniaturized. When a lens group with negative refractive power is arranged on the image side of the first subsequent lens group Lr1, while miniaturizing the entire system, it is possible to correct zoom fluctuations such as field curvature well when zooming from the wide-angle end to the telephoto end.

[0067] Also, in the zoom lenses L0 of Embodiments 1 to 4, 6 to 12, and 14, at least a part of the fixed lens group Ls includes an anti-shake group IS. The anti-shake group IS reduces the shake of the captured image by moving so as to include a component in the direction perpendicular to the optical axis during shake correction. This anti-shake group IS is composed of a cemented lens of one negative lens and one positive lens, suppressing chromatic aberration fluctuations during image shake correction. By arranging the anti-shake group IS adjacent to the aperture stop SP, the weight of the anti-shake group that moves for shake correction can be reduced. Also, by mounting it on a lens group that is stationary with respect to the image plane IP during zooming, it is preferable in that an anti-shake function can be realized without increasing the weight of moving groups such as the intermediate group LM and the first subsequent lens group Lr1.

[0068] In the zoom lens L0 of each embodiment, it is preferable that a negative lens is arranged on the most object side of the first lens group L1. This enables appropriate correction of off-axis aberrations while achieving wide-angleization. The lens on the most object side of the first lens group L1 is more preferably a lens with a convex surface facing the object side. This can enhance the effect of correcting off-axis aberrations while achieving wide-angleization. Also, the first lens group L1 is preferably composed of four or fewer lenses. This can reduce the total thickness of the first lens group L1 and enable miniaturization of the zoom lens.

[0069] In the zoom lens L0 of each embodiment, among the lens groups constituting the intermediate group LM, the lens group that moves during zooming preferably moves entirely toward the object side during zooming from the wide-angle end to the telephoto end. Thereby, a high magnification effect can be achieved. Note that it is more preferable that all the lens groups constituting the intermediate group LM are lens groups with positive refractive power. Thereby, a high magnification effect can be achieved more efficiently.

[0070] In the zoom lens L0 of each embodiment, among the lens groups constituting the subsequent group LR, the lens group that moves during zooming preferably moves entirely toward the object side during zooming from the wide-angle end to the telephoto end. Thereby, it becomes possible to achieve a high magnification effect. Note that it is more preferable that the first subsequent lens group Lr1 has positive refractive power. Thereby, a high magnification effect can be achieved more efficiently.

[0071] In the zoom lens L0 of each embodiment, the lens group that is the most image-side in the subsequent group LR is preferably stationary during zooming. The lens included in the lens group arranged on the most image side has a large outer diameter and is likely to have a high weight. By adopting the configuration as described above, rapid and silent zooming can be realized.

[0072] Next, the specific configuration of the optical system of each embodiment will be described.

[0073] [Embodiment 1] The zoom lens of Embodiment 1 is composed of a first lens group L1 with negative refractive power, a first intermediate lens group Lm1 with positive refractive power, a fixed lens group Ls with negative refractive power, a first subsequent lens group Lr1 with positive refractive power, a second subsequent lens group Lr2 with negative refractive power, and a third subsequent lens group Lr3 with positive refractive power, which are arranged in order from the object side to the image side.

[0074] During zooming, the first lens group L1, the fixed lens group Ls, and the third subsequent lens group Lr3 are stationary with respect to the image plane IP. During zooming from the wide-angle end to the telephoto end, the first intermediate lens group Lm1 and the first subsequent lens group Lr1 move monotonously toward the object side. During zooming from the wide-angle end to the intermediate zoom position, the second subsequent lens group Lr2 moves monotonously toward the object side while narrowing the distance from the first subsequent lens group Lr1. During zooming from the intermediate zoom position to the telephoto end, the second subsequent lens group Lr2 moves monotonously toward the object side while widening the distance from the first subsequent lens group Lr1. Also, during focusing from infinity to the closest subject, the second subsequent lens group Lr2 moves toward the image side.

[0075] [Example 2] The zoom lens of Example 2 is composed of a first lens group L1 with negative refractive power, a first intermediate lens group Lm1 with positive refractive power, a second intermediate lens group Lm2 with positive refractive power, a fixed lens group Ls with negative refractive power, a first subsequent lens group Lr1 with positive refractive power, a second subsequent lens group Lr2 with negative refractive power, and a third subsequent lens group Lr3 with positive refractive power, which are arranged in order from the object side to the image side.

[0076] During zooming, the first lens group L1, the fixed lens group Ls, and the third subsequent lens group Lr3 are stationary with respect to the image plane IP. During zooming from the wide-angle end to the telephoto end, the first intermediate lens group Lm1 and the first subsequent lens group Lr1 move monotonously toward the object side. During zooming from the wide-angle end to the intermediate zoom position, the second intermediate lens group Lm2 moves monotonously toward the object side while widening the distance from the first intermediate lens group Lm1, and the second subsequent lens group Lr2 moves monotonously toward the object side while narrowing the distance from the first subsequent lens group Lr1. During zooming from the intermediate zoom position to the telephoto end, the second intermediate lens group Lm2 moves monotonously toward the object side while narrowing the distance from the first intermediate lens group Lm1, and the second subsequent lens group Lr2 moves monotonously toward the object side while widening the distance from the first subsequent lens group Lr1. Also, during focusing from infinity to the closest subject, the second subsequent lens group Lr2 moves toward the image side.

[0077] [Example 3] The zoom lens of Example 3 is composed of a first lens group L1 with negative refractive power, a first intermediate lens group Lm1 with positive refractive power, a fixed lens group Ls with negative refractive power, a first subsequent lens group Lr1 with positive refractive power, a second subsequent lens group Lr2 with negative refractive power, and a third subsequent lens group Lr3 with positive refractive power, which are arranged in order from the object side to the image side. Regarding the configuration of the movement trajectories of the lens groups during zooming and focusing, it is the same as that of Example 1.

[0078] [Example 4] The zoom lens of Example 4 is composed of a first lens group L1 with negative refractive power, a first intermediate lens group Lm1 with positive refractive power, a fixed lens group Ls with negative refractive power, a first subsequent lens group Lr1 with positive refractive power, a second subsequent lens group Lr2 with negative refractive power, and a third subsequent lens group Lr3 with positive refractive power, which are arranged in order from the object side to the image side. Regarding the configuration of the movement trajectories of the lens groups during zooming and focusing, it is the same as that of Example 1.

[0079] [Example 5] The zoom lens of Example 5 is composed of a first lens group L1 with negative refractive power, a first intermediate lens group Lm1 with positive refractive power, a fixed lens group Ls with negative refractive power, a first subsequent lens group Lr1 with positive refractive power, a second subsequent lens group Lr2 with negative refractive power, and a third subsequent lens group Lr3 with positive refractive power, which are arranged in order from the object side to the image side. Regarding the configuration of the movement trajectories of the lens groups during zooming and focusing, it is the same as that of Example 1.

[0080] [Example 6] The zoom lens of Example 6 is composed of a first lens group L1 with negative refractive power, a first intermediate lens group Lm1 with positive refractive power, a fixed lens group Ls with negative refractive power, a first subsequent lens group Lr1 with positive refractive power, a second subsequent lens group Lr2 with negative refractive power, and a third subsequent lens group Lr3 with positive refractive power, which are arranged in order from the object side to the image side. Regarding the configuration of the movement trajectories of the lens groups during zooming and focusing, it is the same as that of Example 1.

[0081] [Example 7] The zoom lens of Example 7 is composed of a first lens group L1 with negative refractive power, a first intermediate lens group Lm1 with positive refractive power, a fixed lens group Ls with negative refractive power, a first subsequent lens group Lr1 with positive refractive power, a second subsequent lens group Lr2 with negative refractive power, and a third subsequent lens group Lr3 with positive refractive power, which are arranged in order from the object side to the image side.

[0082] During zooming, the first lens group L1, the fixed lens group Ls, and the third subsequent lens group Lr3 are stationary with respect to the image plane IP. When zooming from the wide-angle end to the telephoto end, the first intermediate lens group Lm1 and the first subsequent lens group Lr1 move monotonically toward the object side. When zooming from the wide-angle end to an intermediate zoom position, the second subsequent lens group Lr2 moves monotonically toward the object side while narrowing the distance from the first subsequent lens group Lr1. When zooming from the intermediate zoom position to the telephoto end, the second subsequent lens group Lr2 moves monotonically toward the object side while widening the distance from the first subsequent lens group Lr1. Also, when focusing from infinity to the closest subject, the first intermediate lens group Lm1 and the second subsequent lens group Lr2 move toward the image side.

[0083] [Example 8] Regarding the configuration other than the movement locus of the lens groups in focusing, it is the same as that of Example 7. In the zoom lens of Example 8, when focusing from infinity to the closest subject at the wide-angle end, the first intermediate lens group Lm1 moves toward the object side, and when focusing from infinity to the closest subject at the telephoto end, the first intermediate lens group Lm1 moves toward the image side.

[0084] [Example 9] The zoom lens of Example 9 is composed of a first lens group L1 with negative refractive power, a first intermediate lens group Lm1 with positive refractive power, a fixed lens group Ls with negative refractive power, a first subsequent lens group Lr1 with positive refractive power, a second subsequent lens group Lr2 with negative refractive power, and a third subsequent lens group Lr3 with positive refractive power, which are arranged in order from the object side to the image side. Regarding the configuration of the movement locus of the lens groups in zooming and focusing, it is the same as that of Example 8.

[0085] [Example 10] The zoom lens of Example 10 is composed of a first lens group L1 with negative refractive power, a first intermediate lens group Lm1 with positive refractive power, a fixed lens group Ls with negative refractive power, a first subsequent lens group Lr1 with positive refractive power, a second subsequent lens group Lr2 with negative refractive power, and a third subsequent lens group Lr3 with positive refractive power, which are arranged in order from the object side to the image side. Regarding the configuration of the movement trajectories of the lens groups during zooming and focusing, it is the same as that of Example 8.

[0086] [Example 11] The zoom lens of Example 11 is composed of a first lens group L1 with negative refractive power, a first intermediate lens group Lm1 with positive refractive power, a fixed lens group Ls with negative refractive power, a first subsequent lens group Lr1 with positive refractive power, and a second subsequent lens group Lr2 with negative refractive power, which are arranged in order from the object side to the image side.

[0087] During zooming, the first lens group L1, the fixed lens group Ls, and the second subsequent lens group Lr2 are stationary with respect to the image plane IP. When zooming from the wide-angle end to the telephoto end, the first intermediate lens group Lm1 moves monotonically toward the object side, and the first subsequent lens group Lr1 moves along a convex trajectory toward the image side. Also, when focusing from infinity to the closest subject distance, some lenses within the second subsequent lens group Lr2 move toward the image side.

[0088] [Example 12] The zoom lens of Example 12 is composed of a first lens group L1 with negative refractive power, a first intermediate lens group Lm1 with positive refractive power, a second intermediate lens group Lm2 with positive refractive power, a fixed lens group Ls with negative refractive power, a first subsequent lens group Lr1 with positive refractive power, and a second subsequent lens group Lr2 with positive refractive power, which are arranged in order from the object side to the image side.

[0089] During zooming, the first lens group L1, the fixed lens group Ls, and the second subsequent lens group Lr2 are stationary with respect to the image plane IP. During zooming from the wide-angle end to the telephoto end, the first intermediate lens group Lm1 and the first subsequent lens group Lr1 move monotonically toward the object side. During zooming from the wide-angle end to the intermediate zoom position, the second intermediate lens group Lm2 moves monotonically toward the object side while increasing the distance from the first intermediate lens group Lm1. During zooming from the intermediate zoom position to the telephoto end, the second intermediate lens group Lm2 moves monotonically toward the object side while decreasing the distance from the first intermediate lens group Lm1. Also, during focusing from infinity to the closest subject, some lenses within the first subsequent lens group Lr1 move toward the image side.

[0090] [Example 13] The zoom lens of Example 12 is composed of a first lens group L1 with negative refractive power, a first intermediate lens group Lm1 with positive refractive power, a second intermediate lens group Lm2 with positive refractive power, a fixed lens group Ls with negative refractive power, a first subsequent lens group Lr1 with positive refractive power, and a second subsequent lens group Lr2 with positive refractive power, which are arranged in order from the object side to the image side. Regarding the configuration of the movement trajectories of the lens groups during zooming and focusing, it is the same as that of Example 12.

[0091] [Example 14] The zoom lens of Example 14 is composed of a first lens group L1 with negative refractive power, a first intermediate lens group Lm1 with positive refractive power, a second intermediate lens group Lm2 with positive refractive power, a fixed lens group Ls with negative refractive power, and a first subsequent lens group Lr1 with positive refractive power, which are arranged in order from the object side to the image side.

[0092] During zooming, the first lens group L1 and the fixed lens group Ls are stationary with respect to the image plane IP. When zooming from the wide-angle end to the telephoto end, the first intermediate lens group Lm1 and the first subsequent lens group Lr1 move monotonically toward the object side. When zooming from the wide-angle end to the intermediate zoom position, the second intermediate lens group Lm2 moves monotonically toward the object side while increasing the distance from the first intermediate lens group Lm1. When zooming from the intermediate zoom position to the telephoto end, the second intermediate lens group Lm2 moves monotonically toward the object side while decreasing the distance from the first intermediate lens group Lm1. Also, when focusing from infinity to the closest subject, some lenses within the first subsequent lens group Lr1 move toward the image side.

[0093] [Example 15] The zoom lens of Example 15 is composed of a first lens group L1 with negative refractive power, a first intermediate lens group Lm1 with positive refractive power, a fixed lens group Ls with negative refractive power, a first subsequent lens group Lr1 with positive refractive power, and a second subsequent lens group Lr2 with negative refractive power, which are arranged in order from the object side to the image side.

[0094] During zooming, the first lens group L1 and the fixed lens group Ls are stationary with respect to the image plane IP. When zooming from the wide-angle end to the telephoto end, the first intermediate lens group Lm1 and the first subsequent lens group Lr1 move monotonically toward the object side. When zooming from the wide-angle end to the intermediate zoom position, the second subsequent lens group Lr2 moves monotonically toward the object side while decreasing the distance from the first subsequent lens group Lr1. When zooming from the intermediate zoom position to the telephoto end, the second subsequent lens group Lr2 moves monotonically toward the object side while increasing the distance from the first subsequent lens group Lr1. Also, when focusing from infinity to the closest subject, the second subsequent lens group Lr2 moves toward the image side.

[0095] Hereinafter, Numerical Examples 1 to 15 corresponding to Examples 1 to 15 are shown.

[0096] In the surface data of each numerical example, r represents the radius of curvature of each optical surface, and d (mm) represents the on-axis distance (distance on the optical axis) between the m-th surface and the (m + 1)-th surface. Here, m is the surface number counted from the light incident side. Also, nd represents the refractive index of each optical member with respect to the d-line, and νd represents the Abbe number of the optical member. Note that the Abbe number νd of a certain material is a value defined by the following formula when the refractive indices at the d-line (587.6 nm), F-line (486.1 nm), C-line (656.3 nm), and g-line (wavelength 435.8 nm) of the Fraunhofer lines are Nd, NF, NC, and Ng, respectively. νd=(Nd - 1) / (NF - NC)

[0097] Note that in each numerical example, the focal length (mm), F-number, and half field angle (°) are all values when the zoom lens of each example is focused on an infinitely distant object. The back focus BF is the distance from the final lens surface to the image plane. The overall optical length is the value obtained by adding the back focus to the distance from the first lens surface to the final lens surface. The lens group includes not only cases composed of multiple lenses but also cases composed of a single lens.

[0098] Also, when the optical surface is an aspherical surface, an asterisk (*) is attached to the right side of the surface number. The aspherical shape can be expressed by the following formula when X is the displacement amount from the vertex of the surface in the optical axis direction, h is the height from the optical axis in the direction perpendicular to the optical axis, R is the paraxial radius of curvature, K is the conic constant, and A4, A6, A8, and A10 are the aspherical coefficients of each order. Note that "e±XX" in each aspherical coefficient means "×10 ±XX ". x=(h 2 / R) / [1 + {1 - (1 + K)(h / R) 2}^ 1 / 2 +A4×h 4 +A6×h 6 +A8×h 8 +A10×h 10

[0099] [Numerical Example 1] Unit: mm Surface data Surface number r d nd νd 1 55.971 1.50 1.80400 46.5 2 19.923 6.30 3 129.400 1.50 1.72916 54.7 4 45.014 2.92 5 -266.970 1.20 1.49700 81.7 6 61.325 0.15 7 30.898 2.59 1.85478 24.8 8 53.178 (variable) 9 78.476 1.00 1.85478 24.8 10 31.335 3.98 1.59282 68.6 11 -67.036 0.15 12* 40.595 4.06 1.58313 59.4 13* -122.866 (variable) 14 (aperture) ∞ 1.67 15 -181.924 1.00 1.77250 49.6 16 23.537 1.81 2.00069 25.5 17 50.288 3.43 18 -22.199 1.00 1.72916 54.7 19 -27.406 (variable) 20* 27.941 7.79 1.49700 81.7 21* -25.717 0.15 22 46.962 5.59 1.49700 81.7 23 -28.833 1.00 1.85478 24.8 24 -77.823 (variable) 25 36.024 1.00 1.69680 55.5 26 16.940 7.83 27 -18.145 1.50 1.58313 59.4 28* -47.332 (variable) 29 -56.752 5.82 1.48749 70.2 30 -25.524 13.50 Image plane ∞ Aspherical data The 12th surface K = 0.00000e+00 A 4=-9.02395e-06 A 6=-1.00648e-08 A 8=-2.55852e-11 A10=-7.53599e-15 The 13th surface K = 0.00000e+00 A 4=-9.91511e-06 A 6=-3.22097e-09 The 20th surface K = 0.00000e+00 A 4=-1.79834e-05 A 6=-5.28858e-09 A 8=-1.27278e-11 The 21st surface K = 0.00000e+00 A 4= 1.06157e-05 A 6=-1.36403e-08 The 28th surface K = 0.00000e+00 A 4=-2.90392e-06 A 6= 9.12665e-09 A 8= 1.49351e-10 A10=-8.38576e-13 Various data Zoom ratio 2.35 Wide angle Medium Telephoto Focal length 20.60 32.25 48.50 F-number 4.08 4.08 4.12 Half field angle 42.00 33.44 24.04 Image height 18.55 21.29 21.63 Overall optical length 125.00 125.00 125.00 BF 13.50 13.50 13.50 d 8 26.22 15.50 4.78 d13 1.50 12.22 22.95 d19 14.08 8.42 1.50 d24 1.82 1.50 4.55 d28 2.93 8.91 12.78 Zoom lens group data Group starting surface Focal length 1 1 -27.81 2 9 33.50 3 14 -49.61 4 20 22.93 5 25 -22.97 6 29 89.67

[0100] [Numerical Example 2] Unit: mm Surface data Surface number r d nd νd 1 54.338 1.50 1.72916 54.7 2 24.780 5.96 3 89.186 1.50 1.72916 54.7 4 34.953 4.40 5 -686.291 1.20 1.49700 81.7 6 34.043 0.15 7 30.277 2.98 1.85478 24.8 8 50.476 (Variable) 9* 67.232 2.12 1.58313 59.4 10 430.017 1.00 11 -98.896 1.00 1.77047 29.7 12 25.513 5.27 1.83481 42.7 13 -125.479 (Variable) 14* 29.483 5.16 1.49700 81.7 15 -61.397 (Variable) 16 (Aperture) ∞ 1.03 17 -1211.455 1.00 1.80400 46.5 18 21.512 1.84 2.00069 25.5 19 43.075 2.72 20 -26.597 1.00 1.77250 49.6 21 -34.929 (variable) 22* 32.089 5.34 1.49700 81.7 23* -32.017 0.15 24 36.754 5.61 1.49700 81.7 25 -26.999 1.00 1.85478 24.8 26 -53.076 (variable) 27 64.051 1.00 1.72916 54.7 28 19.236 10.20 29 -19.040 1.00 1.72916 54.7 30 -39.959 (variable) 31 -57.820 5.16 1.74400 44.8 32 -28.445 13.50 Image plane ∞ Aspherical data Surface 9 K = 0.00000e+00 A 4= 1.57975e-06 A 6=-1.49605e-08 A 8= 9.56357e-11 A10=-3.40589e-13 Surface 14 K = 0.00000e+00 A 4=-1.00522e-05 A 6= 2.08652e-09 A 8=-5.95610e-11 A10= 1.71359e-13 Surface 22 K = 0.00000e+00 A 4=-1.31680e-05 A 6= 1.67994e-08 A 8=-3.81526e-12 Surface 23 K = 0.00000e+00 A 4= 8.24165e-06 A 6= 1.26404e-08 Various data Zoom ratio 2.83 Wide-angle mid-telephoto Focal length 20.60 30.17 58.20 F-number 4.08 4.08 4.12 Half field angle 42.15 34.80 20.39 Image height 18.65 20.97 21.63 Overall optical length 130.00 130.00 130.00 BF 13.50 13.50 13.50 d 8 28.21 14.94 1.74 d13 1.00 5.99 1.00 d15 1.00 9.28 27.46 d21 13.69 9.86 1.00 d26 1.32 1.00 3.04 d30 2.00 6.15 12.96 Zoom lens group data Group Starting surface Focal length 1 1 -28.76 2 9 115.59 3 14 40.85 4 16 -47.23 5 22 22.32 6 27 -19.69 7 31 70.01

[0101] [Numerical Example 3] Unit mm Surface data Surface number r d nd νd 1 41.440 1.50 1.90043 37.4 2 19.957 6.17 3 132.238 1.50 1.80400 46.5 4 32.151 4.69 5 -66.010 1.20 1.49700 81.7 6 71.703 0.15 7 37.710 2.70 1.85478 24.8 8 97.739 (variable) 9* 96.988 3.28 1.58313 59.4 10* -92.129 0.15 11 55.846 3.79 1.59282 68.6 12 -32.452 1.00 1.85478 24.8 13 -50.684 (variable) 14 -60.007 1.00 1.58913 61.1 15 24.460 1.86 1.90366 31.3 16 47.766 2.26 17 (aperture) ∞ (variable) 18 22.524 7.67 1.49700 81.7 19 -22.543 1.00 1.90366 31.3 20 -54.292 0.15 21* 42.203 5.41 1.49700 81.7 22* -27.553 (variable) 23 32.781 1.01 1.72916 54.7 24 14.302 9.78 25 -28.558 1.50 1.58313 59.4 26* -114.619 (variable) 27 -56.891 6.06 1.49700 81.7 28 -25.785 13.50 image plane ∞ Aspherical data Surface 9 K = 0.00000e+00 A 4=-1.18326e-05 A 6=-9.52044e-09 A 8=-3.43097e-11 Surface 10 K = 0.00000e+00 A 4=-8.46975e-06 A 6=-1.36754e-08 Surface 21 K = 0.00000e+00 A 4=-4.73747e-05 A 6=-1.09658e-07 A 8= 4.70777e-11 The 22nd surface K = 0.00000e+00 A 4=-4.61456e-06 A 6=-6.55507e-08 A 8= 2.37099e-11 The 26th surface K = 0.00000e+00 A 4= 7.89272e-06 A 6=-5.60861e-08 A 8= 1.87916e-10 A10=-1.66382e-12 Various data Zoom ratio 2.35 Wide angle, middle, telephoto Focal length 18.54 29.45 43.65 F number 4.08 4.08 4.12 Half field angle 45.15 35.89 26.37 Image height 18.63 21.31 21.63 Overall optical length 125.00 125.00 125.00 BF 13.50 13.50 13.50 d 8 23.35 13.93 4.50 d13 1.50 10.93 20.35 d17 18.86 9.78 1.50 d22 1.69 1.50 4.42 d26 2.26 11.54 16.89 Zoom lens group data Group, starting surface, focal length 1 1 -22.28 2 9 32.49 3 14 -63.06 4 18 22.22 5 23 -21.20 6 27 89.13

[0102] [Numerical Example 4] Unit: mm Surface data Surface number r d nd νd 1 58.697 2.00 1.76450 49.1 2* 21.767 3.32 3 38.714 1.50 1.83481 42.7 4 20.959 7.47 5 -64.894 1.20 1.49700 81.5 6 25.687 5.00 1.77047 29.7 7 97.829 (variable) 8 33.056 1.00 1.85478 24.8 9 19.330 3.83 1.51823 58.9 10 -139.181 0.15 11 33.951 2.59 1.52841 76.5 12 -103.323 (variable) 13 (aperture) ∞ 1.90 14 -48.037 2.42 2.00069 25.5 15 -16.386 1.00 1.90043 37.4 16 807.343 2.89 17 -19.763 1.00 1.48749 70.2 18 -21.850 (variable) 19* 29.813 7.00 1.49700 81.5 20* -33.870 0.15 21 41.689 7.00 1.49700 81.5 22 -24.832 0.90 1.85478 24.8 23 -37.687 (variable) 24 42.207 1.00 1.90043 37.4 25 18.378 6.69 26* -15.828 1.50 1.76450 49.1 27* -24.724 (variable) 28 -57.966 4.66 1.49700 81.5 29 -28.192 14.00 Image plane ∞ Aspherical data Second surface K = 0.00000e+00 A 4=-4.34926e-06 A 6=-2.33849e-08 A 8= 4.58313e-11 A10=-1.49569e-13 Nineteenth surface K = 0.00000e+00 A 4=-1.22772e-05 A 6=-3.46073e-09 A 8= 2.87619e-11 Twentieth surface K = 0.00000e+00 A 4= 1.92100e-05 A 6=-3.82227e-08 A 8= 4.64430e-11 A10= 3.78185e-14 Twenty-sixth surface K = 0.00000e+00 A 4= 1.29444e-04 A 6=-1.08636e-06 A 8= 3.17187e-09 Twenty-seventh surface K = 0.00000e+00 A 4= 1.11929e-04 A 6=-9.28670e-07 A 8= 3.51613e-09 A10=-3.25660e-12 Various data Zoom ratio 2.06 Wide angle Middle Telephoto Focal length 16.48 24.46 33.95 F-number 4.08 4.08 4.12 Half field angle 48.64 41.13 32.51 Image height 18.72 21.36 21.64 Overall optical length 122.38 122.38 122.38 BF 14.00 14.00 14.00 d 7 22.20 14.45 6.70 d12 1.50 9.25 17.01 d18 14.55 7.59 1.50 d23 1.77 1.43 3.29 d27 2.17 9.47 13.71 Zoom lens group data Group start surface Focal length 1 1 -20.75 2 8 31.31 3 13 -56.76 4 19 21.37 5 24 -22.10 6 28 104.98

[0103] [Numerical Example 5] Unit: mm Surface data Surface number r d nd νd 1 53.669 2.00 1.76450 49.1 2* 22.183 2.84 3 38.357 1.50 1.90043 37.4 4 18.785 9.89 5 -44.427 1.20 1.49700 81.5 6 49.651 0.15 7 44.261 3.66 1.77047 29.7 8 -230.038 (Variable) 9 45.949 1.00 1.80610 33.3 10 19.217 3.47 1.59282 68.6 11 -1161.013 0.15 12 30.492 2.63 1.59282 68.6 13 -236.362 (Variable) 14 (Aperture) ∞ 1.59 15 -234.100 2.80 1.76182 26.5 16 -19.123 1.00 1.85150 40.8 17 144.749 (Variable) 18* 30.612 7.00 1.49700 81.5 19* -26.983 0.15 20 34.872 5.95 1.49700 81.5 21 -28.140 0.90 1.85478 24.8 22 -85.522 (Variable) 23 37.240 1.00 1.90043 37.4 24 19.516 5.60 25* -17.122 1.50 1.76450 49.1 26* -30.456 (Variable) 27 -85.253 2.94 1.65160 58.5 28 -42.164 14.00 Image plane ∞ Aspherical data Second surface K = 0.00000e+00 A 4=-7.07546e-06 A 6=-2.29052e-08 A 8= 2.47534e-11 A10=-1.17938e-13 Eighteenth surface K = 0.00000e+00 A 4=-8.44890e-06 A 6=-3.82470e-09 A 8=-5.75965e-11 Nineteenth surface K = 0.00000e+00 A 4= 1.76346e-05 A 6=-3.88394e-08 A 8=-9.63881e-12 A10=-8.53919e-14 Twenty-fifth surface K = 0.00000e+00 A 4= 1.70156e-04 A 6=-1.66700e-06 A 8= 5.33737e-09 Twenty-sixth surface K = 0.00000e+00 A4 = 1.53337e-04 A6 = -1.50071e-06 A8 = 6.44506e-09 A10 = -8.76750e-12 Various data Zoom ratio 2.06 Wide angle, middle, telephoto Focal length 16.48, 24.29, 33.95 F-number 4.08, 4.08, 4.12 Half field angle 48.72, 40.93, 32.51 Image height 18.77, 21.06, 21.64 Overall optical length 115.00, 115.00, 115.00 BF 14.00, 14.00, 14.00 d8 20.80, 13.08, 5.36 d13 1.50, 9.22, 16.94 d17 15.35, 7.91, 1.50 d22 2.10, 1.43, 3.02 d26 2.31, 10.42, 15.24 Zoom lens group data Group, starting surface, focal length 1 1 -22.50 2 9 35.28 3 14 -71.91 4 18 22.64 5 23 -24.10 6 27 124.67

[0104] [Numerical Example 6] Unit: mm Surface data Surface number, r, d, nd, νd 1 44.533 1.50 1.77250 49.6 2 20.992 5.66 3 73.567 1.50 1.80400 46.5 4 29.832 4.47 5 -172.934 1.20 1.49700 81.7 6 48.519 0.15 7 31.255 3.01 1.78880 28.4 8 68.730 (Variable) 9 79.435 3.25 1.49700 81.7 10 -45.179 1.20 11 -24.562 1.00 1.83400 37.2 12 34.401 5.31 1.72916 54.7 13 -34.813 0.15 14* 42.104 5.77 1.58313 59.4 15 -35.886 (Variable) 16 (Aperture) ∞ 1.53 17 -904.823 1.67 1.95375 32.3 18 -42.600 0.90 1.48749 70.2 19 107.911 1.79 20 -349.574 1.00 1.77250 49.6 21 31.263 1.20 1.84666 23.8 22 50.350 3.16 23 -19.392 1.04 1.61340 44.3 24 -34.336 (Variable) 25* 49.454 6.26 1.49700 81.7 26* -26.967 0.15 27 54.481 5.64 1.49700 81.7 28 -26.236 1.00 1.85478 24.8 29 -60.992 (Variable) 30 50.563 1.00 1.80400 46.5 31 27.102 7.01 32 -17.553 1.00 1.90043 37.4 33 -23.373 (variable) 34 -57.796 2.77 1.80400 46.5 35 -38.530 13.50 Image plane ∞ Aspherical data 14th surface K = 0.00000e+00 A 4=-6.04468e-06 A 6=-2.23904e-09 A 8=-2.53345e-11 A10= 1.03244e-13 25th surface K = 0.00000e+00 A 4=-9.67884e-06 A 6= 1.40095e-08 A 8=-2.52209e-11 26th surface K = 0.00000e+00 A 4= 1.95762e-06 A 6= 2.83032e-09 Various data Zoom ratio 2.35 Wide angle Middle Telephoto Focal length 20.60 32.48 48.50 F-number 4.08 4.08 4.12 Half field angle 42.05 33.09 24.04 Image height 18.58 21.16 21.63 Overall optical length 127.50 127.50 127.50 BF 13.50 13.50 13.50 d 8 22.55 12.11 1.68 d15 1.50 11.94 22.37 d24 10.63 6.61 1.50 d29 4.89 1.50 3.76 d33 3.14 10.54 13.39 Zoom lens group data Group Start surface Focal length 1 1 -27.83 29 30.33 31 6 -41.01 42 5 27.38 53 0 -38.50 63 4 135.10

[0105] [Numerical Example 7] Unit: mm Surface data Surface number r d nd νd 1 -332.917 1.80 1.76385 48.5 2 25.347 6.46 3* -89.543 1.60 1.76385 48.5 4* 148.869 0.03 5 73.647 4.75 1.72047 34.7 6 -65.376 (variable) 7 -381.956 1.00 1.84666 23.8 8 52.677 3.96 1.69680 55.5 9 -109.363 0.20 10 52.431 4.02 1.76385 48.5 11 -100.014 (variable) 12 -86.241 0.80 1.72916 54.7 13 30.662 2.33 2.05090 26.9 14 74.224 3.52 15 -29.525 2.16 1.89286 20.4 16 -20.944 0.80 1.83481 42.7 17 -96.607 1.50 18 (Diaphragm) ∞ (variable) 19 31.450 6.18 1.53775 74.7 20 -27.348 0.90 1.85478 24.8 21 -48.292 0.20 22 22.168 3.45 1.59522 67.7 23 47.167 5.57 24 20.467 0.90 1.89190 37.1 25 12.121 5.37 1.49700 81.5 26* 254.891 (Variable) 27 83.261 2.10 1.84666 23.8 28 773.452 0.80 1.77250 49.6 29 21.065 (Variable) 30* 32.897 2.32 1.58313 59.4 31 36.706 13.17 Image plane ∞ Aspherical data Third surface K = 0.00000e+00 A 4= 3.43098e-06 A 6=-2.29131e-08 A 8= 1.89653e-11 Fourth surface K = 0.00000e+00 A 4=-1.02961e-06 A 6=-2.36250e-08 A 8= 1.49084e-11 Twenty-sixth surface K = 0.00000e+00 A 4= 5.78724e-05 A 6=-7.01103e-09 A 8= 9.04634e-10 Thirtieth surface K = 0.00000e+00 A 4= 8.76695e-06 A 6= 3.91983e-08 A 8= 7.56081e-12 Various data Zoom ratio 2.51 Wide angle Middle Telephoto Focal length 17.41 31.98 43.65 F-number 2.91 2.91 2.91 Half field angle 38.10 23.13 17.38 Image height 13.66 13.66 13.66 Overall lens length: 124.15 124.15 124.15 BF: 13.17 13.17 13.17 d: 6 21.82 6.28 2.07 d11: 2.21 17.76 21.96 d18: 16.47 9.80 3.62 d26: 2.91 1.48 1.83 d29: 4.84 12.93 18.75 Zoom lens group data Group, starting surface, focal length 1, 1, -45.28 2, 7, 42.38 3, 12, -32.22 4, 19, 22.68 5, 27, -38.45 6, 30, 444.06

[0106] [Numerical Example 8] Unit: mm Surface data Surface number, r, d, nd, νd 1, 118.020, 1.60, 1.76385, 48.5 2, 23.685, 7.97 3*, -50.770, 1.60, 1.58313, 59.4 4*, 109.690, 1.75 5, 110.746, 3.80, 1.73800, 32.3 6, -94.579 (variable) 7, -136.641, 1.00, 1.85478, 24.8 8, 57.360, 4.41, 1.69680, 55.5 9, -64.101, 0.20 10, 48.582, 4.11, 1.76385, 48.5 11, -111.989 (variable) 12, -98.602, 0.80, 1.72916, 54.7 13 32.718 2.27 2.05090 26.9 14 75.735 4.19 15 -26.986 2.09 1.92286 18.9 16 -20.549 0.80 1.83481 42.7 17 -72.712 1.50 18 (Diaphragm) ∞ (Variable) 19 29.871 6.62 1.49700 81.5 20 -25.181 0.90 1.85478 24.8 21 -38.545 0.17 22 17.791 3.93 1.59522 67.7 23 40.181 3.00 24 22.506 0.90 1.88300 40.8 25 10.844 5.42 1.49700 81.5 26* 161.397 (Variable) 27 97.619 1.91 1.84666 23.8 28 306.484 0.80 1.77250 49.6 29 22.435 (Variable) 30* -135.522 2.21 1.58313 59.4 31 -87.564 10.19 Image plane ∞ Aspherical data The 3rd surface K = 0.00000e+00 A4 = 4.59570e-06 A6 = -3.49617e-08 A8 = 5.51624e-11 The 4th surface K = 0.00000e+00 A4 = -4.72864e-07 A6 = -3.44694e-08 A8 = 5.53382e-11 The 26th surface K = 0.00000e+00 A4 = 6.85922e-05 A6 = 3.07337e-08 A8 = 1.69993e-09 Page 30 K = 0.00000e+00 A 4= 4.77548e-06 A 6= 2.21469e-08 A 8= 4.07033e-11 Various data Zoom ratio 2.82 Wide angle Middle Telephoto Focal length 15.46 31.99 43.65 F number 2.91 2.91 2.91 Half angle of view 37.54 23.12 17.38 Image height 11.88 13.66 13.66 Overall lens length 124.10 124.10 124.10 BF 10.19 10.19 10.19 d 6 23.00 5.92 1.40 d11 1.46 18.54 23.06 d18 15.63 7.22 1.30 d26 3.65 1.69 2.61 d29 6.20 16.57 21.57 Zoom lens group data Group Starting surface Focal length 1 1 -38.13 2 7 40.01 3 12 -33.65 4 19 22.07 5 27 -39.12 6 30 417.26

[0107] [Numerical Example 9] Unit: mm Surface data Surface number r d nd νd 1 167.499 1.80 1.76385 48.5 2 26.369 7.22 3* -53.343 1.60 1.76385 48.5 4 * 167.826 0.20 5 96.083 3.96 1.72047 34.7 6 -82.901 (variable) 7 140.447 1.00 1.84666 23.8 8 43.991 4.15 1.69680 55.5 9 -108.751 0.20 10 56.250 3.39 1.76385 48.5 11 -185.009 (variable) 12 -163.340 0.80 1.72916 54.7 13 41.714 1.92 2.05090 26.9 14 96.310 2.97 15 -34.744 2.02 1.89286 20.4 16 -22.485 0.80 1.83481 42.7 17 -303.887 1.50 18 (aperture) ∞ (variable) 19 27.271 6.14 1.53775 74.7 20 -30.855 0.90 1.85478 24.8 21 -54.092 0.20 22 20.147 4.22 1.59522 67.7 23 76.516 2.24 24 37.864 0.90 1.89190 37.1 25 13.737 4.38 1.49700 81.5 26 * 107.300 (variable) 27 128.473 2.73 1.84666 23.8 28 -46.804 0.80 1.77250 49.6 29 22.194 (variable) 30 * -108.835 2.10 1.58313 59.4 31 -70.097 9.95 Image plane ∞ Aspherical data The third surface K = 0.00000e+00 A 4=-9.16378e-07 A 6=-1.96230e-08 A 8= 3.81840e-11 The fourth surface K = 0.00000e+00 A 4=-3.77722e-06 A 6=-1.62618e-08 A 8= 3.62305e-11 The 26th surface K = 0.00000e+00 A 4= 5.90998e-05 A 6= 9.56405e-08 A 8= 9.99400e-10 The 30th surface K = 0.00000e+00 A 4= 2.92932e-06 A 6=-2.47771e-08 A 8= 1.21399e-10 Various data Zoom ratio 4.35 Wide angle, intermediate, telephoto Focal length 17.25 45.03 75.00 F-number 2.91 3.28 4.41 Half field angle 34.48 16.87 10.32 Image height 11.85 13.66 13.66 Overall lens length 135.58 135.58 135.58 BF 9.95 9.95 9.95 d 6 25.35 7.91 0.20 d11 1.50 18.94 26.65 d18 28.32 12.32 1.28 d26 5.44 1.93 7.16 d29 6.89 26.41 32.21 Zoom lens group data Group, starting surface, focal length 1 1 -38.34 2 7 38.02 3 12 -35.44 4 19 24.64 5 27 -38.20 6 30 331.11

[0108] [Numerical Example 10] Unit: mm Surface data Surface number r d nd νd 1 61.266 1.80 1.76385 48.5 2 18.465 11.10 3* -39.237 1.60 1.58313 59.4 4* 26.218 0.13 5 28.285 9.04 1.72047 34.7 6 -61.599 (variable) 7 369.721 1.00 1.84666 23.8 8 26.909 6.42 1.69680 55.5 9 -186.382 0.20 10 50.295 4.81 1.76385 48.5 11 -71.633 (variable) 12 -108.372 0.80 1.72916 54.7 13 27.941 1.85 2.05090 26.9 14 62.435 3.02 15 -42.043 2.11 1.89286 20.4 16 -26.736 0.80 1.83481 42.7 17 78.002 1.50 18 (aperture) ∞ (variable) 19 43.195 0.82 1.59522 67.7 20 27.652 3.14 1.84666 23.8 21 35.868 0.70 22 22.884 4.77 1.59522 67.7 23 252.477 0.20 24 27.897 0.90 1.89190 37.1 25 14.572 7.16 1.49700 81.5 26* -46.112 (Variable) 27 -84.034 0.90 1.85478 24.8 28 283.836 1.78 1.77250 49.6 29 -2004.547 (Variable) 30* -502.765 2.01 1.58313 59.4 31 -62.990 39.99 Image plane ∞ Aspherical data The third surface K = 0.00000e+00 A 4= 6.41760e-06 A 6=-1.24201e-08 A 8= 1.54779e-11 The fourth surface K = 0.00000e+00 A 4=-2.49794e-06 A 6=-2.04786e-08 A 8= 2.62104e-11 The 26th surface K = 0.00000e+00 A 4= 2.05099e-05 A 6=-1.84962e-08 A 8= 1.53994e-10 The 30th surface K = 0.00000e+00 A 4=-7.52864e-07 A 6=-1.09055e-08 A 8= 2.83865e-11 Various data Zoom ratio 2.50 Wide angle Medium Telephoto Focal length 17.44 29.41 43.64 F number 2.91 2.91 2.91 Half field angle 36.07 26.71 18.73 Image height 12.70 14.80 14.80 Overall lens length 156.79 156.79 156.79 BF 39.99 39.99 39.99 d 6 21.82 7.13 3.16 d11 2.21 16.90 20.87 d18 16.47 12.83 4.49 d26 2.91 2.22 9.86 d29 4.84 9.15 9.86 Zoom lens group data Group starting surface Focal length 1 1 -40.73 2 7 38.19 3 12 -23.11 4 19 28.04 5 27 -99.29 6 30 123.29

[0109] [Numerical Example 11] Unit: mm Surface data Surface number r d nd νd 1 30.711 1.50 1.72916 54.7 2 16.148 4.80 3 68.999 1.50 1.77250 49.6 4 28.604 4.69 5 -58.369 1.20 1.49700 81.7 6 98.777 0.15 7 28.357 2.31 1.73800 32.3 8 64.238 (Variable) 9 47.409 4.20 1.56873 63.1 10 -26.108 0.83 11 -19.080 1.00 1.77047 29.7 12 -68.169 0.15 13* 425.046 5.51 1.58313 59.4 14 - 19.501 (Variable) 15 (Aperture) ∞ 1.73 16 - 123.344 1.00 1.69680 55.5 17 23.704 1.59 2.00069 25.5 18 44.369 3.04 19 - 26.382 1.00 1.61772 49.8 20 - 38.560 (Variable) 21* 29.609 8.00 1.49700 81.7 22* - 22.856 0.15 23 1041.183 4.65 1.49700 81.7 24 - 24.200 1.00 1.85478 24.8 25 - 43.906 1.36 26 558.657 1.27 1.56873 63.1 27 23.100 (Variable) 28 - 55.418 1.50 1.85150 40.8 29 238.853 0.15 30* 48.700 4.92 1.76450 49.1 31 413.609 14.46 Image plane ∞ Aspherical data The 13th surface K = 0.00000e+00 A4 = - 2.03144e - 05 A6 = - 2.08106e - 08 A8 = 1.07173e - 10 A10 = - 5.09619e - 13 The 21st surface K = 0.00000e+00 A4 = - 1.79690e - 05 A6 = 2.87188e - 08 A8 = - 8.62992e - 11 The 22nd surface K = 0.00000e+00 A4 = 1.98378e - 05 A6 = - 3.52948e - 10 The 30th surface K = 0.00000e+00 A4 = 2.11623e-06 A6 = -6.27640e-09 A8 = 8.44709e-12 Various data Zoom ratio 2.00 Wide angle, Medium, Telephoto Focal length 24.72 32.75 49.50 F-number 4.08 4.08 4.12 Half angle of view 37.67 32.97 23.61 Image height 19.09 21.24 21.64 Overall lens length 118.28 118.28 118.28 BF 14.46 14.46 14.46 d8 18.59 10.59 2.28 d14 1.50 9.50 17.81 d20 10.05 9.60 1.50 d27 14.49 14.94 23.04 Zoom lens group data Group, Starting surface, Focal length 1 1 -27.55 2 9 28.98 3 15 -44.22 4 21 41.24 5 28 -202.91

[0110] [Numerical Example 12] Unit: mm Surface data Surface number, r, d, nd, νd 1 36.999 2.00 1.72916 54.7 2 21.924 4.99 3 62.050 1.50 1.72916 54.7 4 28.449 4.89 5 -136.322 1.20 1.49700 81.7 6 34.187 0.15 7 28.321 6.00 1.85478 24.8 8 42.098 (Variable) 9* 36.118 3.78 1.49700 81.7 10 -93.887 (Variable) 11 -24.869 1.00 1.77047 29.7 12 37.557 5.71 1.85150 40.8 13 -30.712 0.15 14* 37.107 3.77 1.58313 59.4 15 -149.468 (Variable) 16 (Aperture) ∞ 2.31 17 317.736 1.00 1.85150 40.8 18 18.282 1.84 2.00069 25.5 19 36.590 (Variable) 20 45.728 3.39 1.49700 81.7 21 -33.553 1.00 1.80610 33.3 22 306.322 4.61 23 32.275 4.58 1.58313 59.4 24* -60.456 5.42 25 -100.082 1.00 1.72916 54.7 26 56.070 (Variable) 27 -57.911 2.10 1.71700 47.9 28 -42.097 13.50 Image plane ∞ Aspherical data Surface 9 K = 0.00000e+00 A 4=-4.31443e-06 A 6=-7.78528e-09 A 8=-3.63706e-12 A10=-1.01010e-14 Surface 14 K = 0.00000e+00 A 4=-2.61289e-06 A 6=-1.86250e-09 A 8=-1.99613e-11 A10= 1.42639e-14 The 24th surface K = 0.00000e+00 A 4= 1.98412e-05 A 6= 4.30643e-09 A 8=-4.87862e-11 Various data Zoom ratio 2.35 Wide angle, intermediate, telephoto Focal length 24.72 41.45 58.20 F number 4.08 4.08 4.12 Half angle of view 38.10 27.43 20.39 Image height 19.38 21.51 21.64 Overall lens length 127.50 127.50 127.50 BF 13.50 13.50 13.50 d 8 22.19 6.30 1.00 d10 3.42 8.39 2.76 d15 1.57 12.50 23.43 d19 14.25 5.21 1.18 d26 10.17 19.21 23.24 Zoom lens group data Group, starting surface, focal length 1 1 -26.40 2 9 52.99 3 11 42.73 4 16 -61.70 5 20 99.00 6 27 203.70

[0111] [Numerical Example 13] Unit: mm Surface data Surface number, r, d, nd, νd 1 56.796 1.50 1.72916 54.7 2 27.536 4.77 3 142.693 1.50 1.72916 54.7 4 38.371 4.39 5 -110.747 1.20 1.49700 81.7 6 41.815 0.15 7 33.190 2.84 1.85478 24.8 8 62.845 (Variable) 9* 74.051 3.87 1.49700 81.7 10 -49.579 (Variable) 11 -29.430 1.00 1.77047 29.7 12 43.467 4.33 1.85150 40.8 13 -47.752 0.15 14* 38.227 5.42 1.58313 59.4 15 -58.313 (Variable) 16 (Diaphragm) ∞ 1.28 17 -106.596 1.00 1.85150 40.8 18 27.329 1.84 2.00069 25.5 19 87.076 (Variable) 20* 31.500 6.32 1.49700 81.7 21 -16.054 1.00 1.80610 33.3 22 -26.499 11.68 23 -12.974 1.00 1.90043 37.4 24 -29.352 (Variable) 25 -1000.000 3.95 1.80518 25.4 26 -54.396 17.55 Image plane ∞ Aspherical data Surface 9 K = 0.00000e+00 A 4=-2.07568e-06 A 6= 3.71698e-09 A 8=-6.22940e-11 A10= 1.96262e-13 Surface 14 K = 0.00000e+00 A 4=-6.51029e-06 A 6=-3.63905e-09 A 8=-1.42223e-11 A10= 4.62400e-14 Surface 20 K = 0.00000e+00 A 4= 1.55170e-05 A 6= 4.32459e-08 A 8= 3.53245e-10 Various data Zoom ratio 2.35 Wide angle, medium, telephoto Focal length 24.72 40.65 58.20 F-number 4.08 4.08 4.12 Half field angle 38.11 27.90 20.39 Image height 19.39 21.52 21.63 Overall optical length 123.00 123.00 123.00 BF 17.55 17.55 17.55 d 8 23.79 8.06 1.34 d10 6.24 11.00 6.75 d15 1.00 11.97 22.94 d19 14.25 6.85 1.00 d24 1.00 8.40 14.25 Zoom lens group data Group, starting surface, focal length 1 1 -29.99 2 9 60.38 3 11 46.47 4 16 -71.05 5 20 455.17 6 25 71.31

[0112] [Numerical Example 14] Unit: mm Surface data Surface number r d nd νd 1 44.531 1.50 2.00100 29.1 2 20.657 6.73 3 210.632 1.30 1.61800 63.4 4 45.601 3.68 5 -88.666 1.20 1.49700 81.7 6 28.010 0.15 7 27.485 3.66 1.85478 24.8 8 73.926 (Variable) 9 -64.473 1.00 1.85478 24.8 10 65.560 4.13 1.90043 37.4 11* -42.967 (Variable) 12 29.960 1.00 1.85150 40.8 13 16.783 8.00 1.71300 53.9 14 -2289.781 (Variable) 15 (Aperture) ∞ 1.56 16* -55.478 0.80 1.61340 44.3 17 51.369 1.73 1.92286 20.9 18 128.910 (Variable) 19* 20.720 7.05 1.49700 81.7 20 330.205 0.15 21 48.899 1.00 1.78880 28.4 22 25.260 6.92 1.49700 81.7 23 -48.974 2.00 24* -38.616 0.87 1.88202 37.2 25* -400.209 (Variable) Image plane ∞ Aspherical Data Surface 11 K = 0.00000e+00 A 4=-1.90040e-07 A 6= 1.42072e-09 A 8=-3.90164e-12 Surface 16 K = 0.00000e+00 A 4= 2.00592e-06 A 6=-1.18338e-08 A 8= 6.27166e-11 Surface 19 K = 0.00000e+00 A 4= 7.64732e-07 A 6= 1.50857e-08 A 8= 2.03528e-11 Surface 24 K = 0.00000e+00 A 4= 3.41308e-05 A 6=-3.63301e-07 A 8= 8.35904e-10 Surface 25 K =-3.70299e+03 A 4= 5.87839e-05 A 6=-2.50755e-07 A 8= 1.14097e-09 A10=-2.46962e-12 A12= 1.37599e-14 Various Data Zoom Ratio 2.01 Wide Angle Middle Telephoto Focal Length 20.60 32.49 41.50 F Number 2.90 2.90 3.20 Half Angle of View 43.70 33.59 27.53 Image Height 19.68 21.58 21.63 Overall Length of Lens 127.50 127.50 127.50 BF 28.43 42.19 47.70 d 8 18.65 2.99 3.03 d11 4.76 13.01 5.57 d14 0.96 8.36 15.76 d18 20.26 6.51 1.00 d25 28.43 42.19 47.70 Zoom lens group data Group starting surface focal length 1 1 -23.27 2 9 109.64 3 12 48.61 4 15 -81.77 5 19 48.56

[0113] [Numerical Example 15] Unit: mm Surface data Surface number r d nd νd 1 44.816 1.50 1.80400 46.5 2 20.440 6.23 3 92.544 1.50 1.77250 49.6 4 35.808 3.49 5 -510.868 1.20 1.49700 81.7 6 47.200 0.15 7 29.071 2.64 1.85478 24.8 8 47.854 (Variable) 9 47.748 1.00 2.00100 29.1 10 23.651 4.71 1.49700 81.7 11 -66.327 0.15 12* 33.352 4.66 1.58313 59.4 13* -86.801 (Variable) 14 (Aperture) ∞ 1.67 15 -170.704 1.00 1.85150 40.8 16 20.909 2.19 1.96300 24.1 17 63.996 3.32 18 -20.682 1.03 1.92286 20.9 19 -18.896 1.00 1.90043 37.4 20 -28.082 (Variable) 21 * 33.286 8.00 1.49700 81.7 22 * -23.911 0.15 23 35.089 6.75 1.43875 94.7 24 -28.057 1.00 1.85478 24.8 25 -74.318 (Variable) 26 34.502 1.00 1.72916 54.7 27 19.231 7.22 28 -16.925 1.50 1.58313 59.4 29 * -31.176 (Variable) Image plane ∞ Aspherical data 12th surface K = 0.00000e+00 A 4=-3.82309e-06 A 6= 1.20970e-09 A 8=-4.64465e-11 A10= 1.38449e-13 13th surface K = 0.00000e+00 A 4=-6.57377e-06 A 6= 1.15474e-09 21st surface K = 0.00000e+00 A 4=-8.02028e-06 A 6= 4.65308e-09 A 8= 2.58858e-12 22nd surface K = 0.00000e+00 A 4= 1.50220e-05 A 6= 2.27226e-09 29th surface K = 0.00000e+00 A 4=-1.60566e-05 A 6= 1.17646e-08 A 8= 1.57721e-11 A10= 2.82330e-13 Various data Zoom ratio 2.35 Wide - angle Medium Telephoto Focal length 20.60 32.37 48.50 F - number 4.08 4.08 4.12 Half picture angle 42.10 33.44 24.04 Image height 18.62 21.38 21.64 Overall optical length 125.00 125.00 125.00 BF 20.19 26.18 28.91 d8 25.10 14.83 4.56 d13 1.50 11.77 22.05 d20 12.88 7.65 1.50 d25 2.26 1.50 4.92 d29 20.19 26.18 28.91 Zoom lens group data Group Starting surface Focal length 1 1 -27.84 2 9 32.53 3 14 -40.71 4 21 23.28 5 26 -30.52

[0114] The various values in each numerical example are summarized in Table 1 below.

[0115] [Table 1]

[0116] [Imaging device] Next, an example of a digital still camera (imaging device) using the zoom lens L0 of the present invention as an imaging optical system will be described with reference to FIG. 31. In FIG. 31, 10 is a camera body, and 11 is a photographing optical system 11 constituted by any one of the zoom lenses L0 described in Examples 1 to 15. 12 is a solid-state imaging device (photoelectric conversion element) such as a CCD sensor or a CMOS sensor that is built in the camera body and receives and photoelectrically converts the optical image formed by the photographing optical system 11. The camera body 10 may be a so-called single-lens reflex camera having a quick return mirror, or a so-called mirrorless camera not having a quick return mirror.

[0117] By applying the optical system of the present invention to an imaging device such as a digital still camera, an imaging device with a small lens can be obtained.

[0118] [Imaging system] In addition, an imaging system (surveillance camera system) including the zoom lens L0 of each embodiment and a control unit for controlling the zoom lens may be configured. In this case, the control unit can control the zoom lens so that each lens group, focusing group, and anti-shake group move as described above during zooming, focusing, and image blur correction. At this time, it is not necessary for the control unit to be integrally configured with the zoom lens, and the control unit may be configured separately from the zoom lens. For example, a configuration may be adopted in which a control unit (control device) arranged remotely from a drive unit for driving each lens of the zoom lens includes a transmission unit that sends a control signal (command) for controlling the zoom lens. According to such a control unit, the zoom lens can be remotely operated.

[0119] Also, a configuration may be adopted in which an operation unit such as a controller and buttons for remotely operating the zoom lens is provided in the control unit, and the zoom lens is controlled in response to an input to the operation unit by the user. For example, an enlargement button and a reduction button may be provided as the operation unit. At this time, a signal may be sent from the control unit to the drive unit of the zoom lens so that when the user presses the enlargement button, the magnification of the zoom lens increases, and when the user presses the reduction button, the magnification of the zoom lens decreases.

[0120] In addition, the imaging system may have a display unit such as a liquid crystal panel that displays information (movement state) related to the zoom of the zoom lens. Information related to the zoom of the zoom lens is, for example, the zoom magnification (zoom state) and the movement amount (movement state) of each lens group. In this case, the user can remotely operate the zoom lens via the operation unit while viewing the information related to the zoom of the zoom lens shown on the display unit. At this time, the display unit and the operation unit may be integrated by adopting, for example, a touch panel.

[0121] The preferred embodiments and examples of the present invention have been described above. However, the present invention is not limited to these embodiments and examples, and various combinations, modifications, and changes are possible within the scope of the gist thereof.

[0122] The embodiments of the present invention include the following configurations.

[0123] [Configuration 1] A zoom lens comprising, in order from the object side to the image side, a first lens group having a negative refractive power, an intermediate group having one or more lens groups and having a positive refractive power as a whole, a fixed lens group having a negative refractive power, and a subsequent group having three or more lens groups, wherein the intervals between adjacent lens groups change during zooming, wherein the first lens group and the fixed lens group are immobile during zooming, and at least a part of the intermediate group or the subsequent group moves during focusing, wherein the first lens group includes at least one negative lens and at least one positive lens, When the lateral magnification at the wide-angle end of the intermediate group is βMw, the lateral magnification at the telephoto end of the intermediate group is βMt, the focal length of the entire system at the wide-angle end of the zoom lens is fw, and the focal length of the entire system at the telephoto end of the zoom lens is ft, 0.60 ≦ (βMt / βMw) / (ft / fw) ≦ 4.00 1.65 ≦ ft / fw ≦ 6.00 A zoom lens characterized by satisfying the conditional expression.

[0124] [Configuration 2] A zoom lens comprising, in order from the object side to the image side, a first lens group having a negative refractive power, an intermediate group having one or more lens groups and having a positive refractive power as a whole, a fixed lens group having a negative refractive power, and a subsequent group having one or more lens groups, having five or more lens groups in the entire system, and the intervals between adjacent lens groups change during zooming, wherein the first lens group and the fixed lens group are immobile during zooming, and at least a part of the subsequent group moves during focusing, The first lens group includes at least one negative lens and at least one positive lens. When the lateral magnification at the wide-angle end of the intermediate group is βMw, the lateral magnification at the telephoto end of the intermediate group is βMt, the overall focal length at the wide-angle end of the zoom lens is fw, the overall focal length at the telephoto end of the zoom lens is ft, the distance on the optical axis from the vertex of the object-side lens surface of the first lens group to the vertex of the image-side lens surface of the first lens group is D1, and the distance on the optical axis from the vertex of the object-side lens surface of the zoom lens at the wide-angle end to the vertex of the image-side lens surface of the zoom lens is TLw, 0.60 ≦ (βMt / βMw) / (ft / fw) ≦ 4.00 2.00 ≦ ft / fw ≦ 6.00 0.04 ≦ D1 / TLw ≦ 0.25 A zoom lens characterized by satisfying the conditional expression.

[0125] [Configuration 3] When the distance on the optical axis from the vertex of the object-side lens surface of the first lens group to the vertex of the image-side lens surface of the first lens group is D1, and the distance on the optical axis from the vertex of the object-side lens surface of the zoom lens at the wide-angle end to the vertex of the image-side lens surface of the zoom lens is TLw, 0.04 ≦ D1 / TLw ≦ 0.25 The zoom lens according to Configuration 1, characterized by satisfying the conditional expression.

[0126] [Configuration 4] When the lateral magnification at the wide-angle end of the first subsequent lens group, which is the most object-side lens group among the subsequent lens groups, is βr1w, and the lateral magnification at the telephoto end of the first subsequent lens group is βr1t, 0.30 ≦ |βr1t / βr1w| / (ft / fw) ≦ 40.0 The zoom lens according to any one of Configurations 1 to 3, characterized by satisfying the conditional expression.

[0127] [Configuration 5] In the zoom lens, 0.99 ≤ (βMt / βMw) ≤ 20.00 The zoom lens according to any one of Configurations 1 to 4, characterized by satisfying the conditional expression.

[0128] [Configuration 6] When the focal length of the first lens group is f1, 0.83 ≤ (-f1) / fw ≤ 5.00 The zoom lens according to any one of Configurations 1 to 5, characterized by satisfying the conditional expression.

[0129] [Configuration 7] When the focal length of the first lens group is f1 and the combined focal length at the telephoto end of the intermediate group is fMt, 0.48 ≤ (-f1) / fMt ≤ 1.27 The zoom lens according to any one of Configurations 1 to 6, characterized by satisfying the conditional expression.

[0130] [Configuration 8] When the focal length of the first lens group is f1 and the focal length of the fixed lens group is fs, 0.10 ≤ (-f1) / (-fs) ≤ 2.00 The zoom lens according to any one of Configurations 1 to 7, characterized by satisfying the conditional expression.

[0131] [Configuration 9] When the focal length of the first lens group is f1 and the focal length of the focusing group that moves during focusing is fF, -3.00 ≤ (-f1) / fF ≤ 1.00 The zoom lens according to any one of Configurations 1 to 8, characterized by satisfying the conditional expression.

[0132] [Configuration 10] When the focal length of the first lens group is f1 and the focal length of the lens group arranged closest to the image side among the subsequent groups is fL, 0.005 ≤ (-f1) / |fL| ≤ 2.00 The zoom lens according to any one of Configurations 1 to 9, characterized by satisfying the following conditional expression.

[0133] [Configuration 11] When the largest air interval among the intervals between surfaces on the optical axis of the lenses arranged in the first lens group is Dm, and the distance on the optical axis from the vertex of the lens surface on the object side of the first lens group to the vertex of the lens surface on the image side of the first lens group is D1, 0.10 ≦ Dm / D1 ≦ 0.60 The zoom lens according to any one of Configurations 1 to 10, characterized by satisfying the following conditional expression.

[0134] [Configuration 12] When the movement amount during zooming from the wide-angle end to the telephoto end of the lens group on the object side among the lens groups constituting the intermediate group is Mm1, and the movement amount during zooming from the wide-angle end to the telephoto end of the lens group on the object side among the lens groups constituting the subsequent group is Mr1, 0.70 ≦ |Mm1| / |Mr1| ≦ 2.50 The zoom lens according to any one of Configurations 1 to 11, characterized by satisfying the following conditional expression.

[0135] [Configuration 13] When the distance on the optical axis from the vertex of the lens surface on the object side of the zoom lens at the wide-angle end to the vertex of the lens surface on the image side of the zoom lens is TLw, and the movement amount of the lens group having the largest movement amount during zooming from the wide-angle end to the telephoto end among the lens groups constituting the intermediate group is Mma, 0.09 ≦ │Mma│ / TLw ≦ 0.27 The zoom lens according to any one of Configurations 1 to 12, characterized by satisfying the following conditional expression.

[0136] [Configuration 14] When the distance on the optical axis from the vertex of the lens surface on the object side of the zoom lens at the wide-angle end to the vertex of the lens surface on the image side of the zoom lens is TLw, and the amount of movement of the lens group with the largest amount of movement during zooming from the wide-angle end to the telephoto end among the lens groups constituting the subsequent group is Mra, 0.06 ≦ │Mra│ / TLw ≦ 0.25 The zoom lens according to any one of Configurations 1 to 13, characterized in that the conditional expression is satisfied.

[0137] [Configuration 15] The subsequent group includes a first subsequent lens group and a second subsequent lens group, which are arranged in order from the object side to the image side. When the focal length of the first subsequent lens group is fr1 and the focal length of the second subsequent lens group is fr2, 0.10 ≦ |fr1| / |fr2| ≦ 10.0 The zoom lens according to any one of Configurations 1 to 14, characterized in that the conditional expression is satisfied.

[0138] [Configuration 16] Among the lens groups constituting the zoom lens, each lens group that moves during zooming has an electrically driven mechanism. The zoom lens according to any one of Configurations 1 to 15, characterized in that.

[0139] [Configuration 17] An imaging device, characterized by having the zoom lens according to any one of Configurations 1 to 16.

[0140] [Configuration 18] The imaging device according to Configuration 17, further comprising an imaging element that photoelectrically converts the optical image formed by the zoom lens.

Explanation of Signs

[0141] L0 Zoom lens L1 First lens group LM Intermediate group Lm1 First intermediate lens group Lm2 Second intermediate lens group Ls Fixed lens group LR Subsequent group Lr1 First subsequent lens group Lr2 Second subsequent lens group

Claims

1. A zoom lens comprising, in order from the object side to the image side, a first lens group having a negative refractive power, an intermediate group having one or more lens groups and having a positive refractive power as a whole, a fixed lens group having a negative refractive power, and a subsequent group having three or more lens groups, wherein the intervals between adjacent lens groups change during zooming, during zooming, the first lens group and the fixed lens group are stationary, and at least a part of the intermediate group or the subsequent group moves during focusing, the first lens group includes at least one negative lens and at least one positive lens, when the lateral magnification at the wide-angle end of the intermediate group is βMw, the lateral magnification at the telephoto end of the intermediate group is βMt, the overall focal length at the wide-angle end of the zoom lens is fw, and the overall focal length at the telephoto end of the zoom lens is ft, 0.60 ≤ (βMt / βMw) / (ft / fw) ≤ 4.00 1.65 ≤ ft / fw ≤ 6.00 A zoom lens characterized by satisfying the conditional expression.

2. A zoom lens comprising, in order from the object side to the image side, a first lens group having a negative refractive power, an intermediate group having one or more lens groups and having a positive refractive power as a whole, a fixed lens group having a negative refractive power, and a subsequent group having one or more lens groups, having five or more lens groups in total, and wherein the intervals between adjacent lens groups change during zooming, during zooming, the first lens group and the fixed lens group are stationary, and at least a part of the subsequent group moves during focusing, the first lens group includes at least one negative lens and at least one positive lens, When the lateral magnification at the wide-angle end of the intermediate group is βMw, the lateral magnification at the telephoto end of the intermediate group is βMt, the overall focal length at the wide-angle end of the zoom lens is fw, the overall focal length at the telephoto end of the zoom lens is ft, the distance on the optical axis from the vertex of the lens surface on the object side of the first lens group to the vertex of the lens surface on the image side of the first lens group is D1, and the distance on the optical axis from the vertex of the lens surface on the object side of the zoom lens at the wide-angle end to the vertex of the lens surface on the image side of the zoom lens is TLw, 0.60 ≤ (βMt / βMw) / (ft / fw) ≤ 4.00 2.00 ≤ ft / fw ≤ 6.00 0.04 ≤ D1 / TLw ≤ 0.25 A zoom lens characterized by satisfying the conditional expression.

3. When the distance on the optical axis from the vertex of the lens surface on the object side of the first lens group to the vertex of the lens surface on the image side of the first lens group is D1, and the distance on the optical axis from the vertex of the lens surface on the object side of the zoom lens at the wide-angle end to the vertex of the lens surface on the image side of the zoom lens is TLw, 0.04 ≤ D1 / TLw ≤ 0.25 The zoom lens according to claim 1, characterized by satisfying the conditional expression.

4. When the lateral magnification at the wide-angle end of the first subsequent lens group, which is the most object-side lens group among the subsequent groups, is βr1w, and the lateral magnification at the telephoto end of the first subsequent lens group is βr1t, 0.30 ≤ |βr1t / βr1w| / (ft / fw) ≤ 40.0 The zoom lens according to any one of claims 1 to 3, characterized by satisfying the conditional expression.

5. In the zoom lens, 0.99 ≤ (βMt / βMw) ≤ 20.00 The zoom lens according to any one of claims 1 to 3, characterized by satisfying the conditional expression.

6. When the focal length of the first lens group is f1, 0.83 ≤ (-f1) / fw ≤ 5.00 The zoom lens according to any one of claims 1 to 3, characterized in that the conditional expression is satisfied.

7. When the focal length of the first lens group is f1 and the combined focal length at the telephoto end of the intermediate group is fMt, 0.48 ≤ (-f1) / fMt ≤ 1.27 The zoom lens according to any one of claims 1 to 3, characterized in that the conditional expression is satisfied.

8. When the focal length of the first lens group is f1 and the focal length of the fixed lens group is fs, 0.10 ≤ (-f1) / (-fs) ≤ 2.00 The zoom lens according to any one of claims 1 to 3, characterized in that the conditional expression is satisfied.

9. When the focal length of the first lens group is f1 and the focal length of the focusing group that moves during focusing is fF, -3.00 ≤ (-f1) / fF ≤ 1.00 The zoom lens according to any one of claims 1 to 3, characterized in that the conditional expression is satisfied.

10. When the focal length of the first lens group is f1 and the focal length of the lens group arranged closest to the image side among the subsequent lens groups is fL, 0.005 ≤ (-f1) / |fL| ≤ 2.00 The zoom lens according to any one of claims 1 to 3, characterized in that the conditional expression is satisfied.

11. When the largest air interval among the surface intervals on the optical axis in the lenses arranged in the first lens group is Dm and the distance on the optical axis from the surface vertex of the most object-side lens surface of the first lens group to the surface vertex of the most image-side lens surface of the first lens group is D1, 0.10 ≤ Dm / D1 ≤ 0.60 The zoom lens according to any one of claims 1 to 3, characterized by satisfying the following conditional expression.

12. When the amount of movement during zooming from the wide-angle end to the telephoto end of the lens group closest to the object side among the lens groups constituting the intermediate group is Mm1, and the amount of movement during zooming from the wide-angle end to the telephoto end of the lens group closest to the object side among the lens groups constituting the subsequent group is Mr1, 0.70 ≦ |Mm1| / |Mr1| ≦ 2.50 The zoom lens according to any one of claims 1 to 3, characterized by satisfying the following conditional expression.

13. When the distance on the optical axis from the vertex of the lens surface closest to the object side of the zoom lens at the wide-angle end to the vertex of the lens surface closest to the image side of the zoom lens is TLw, and the amount of movement of the lens group with the largest amount of movement during zooming from the wide-angle end to the telephoto end among the lens groups constituting the intermediate group is Mma, 0.09 ≦ |Mma| / TLw ≦ 0.27 The zoom lens according to any one of claims 1 to 3, characterized by satisfying the following conditional expression.

14. When the distance on the optical axis from the vertex of the lens surface closest to the object side of the zoom lens at the wide-angle end to the vertex of the lens surface closest to the image side of the zoom lens is TLw, and the amount of movement of the lens group with the largest amount of movement during zooming from the wide-angle end to the telephoto end among the lens groups constituting the subsequent group is Mra, 0.06 ≦ |Mra| / TLw ≦ 0.25 The zoom lens according to any one of claims 1 to 3, characterized by satisfying the following conditional expression.

15. The subsequent group includes a first subsequent lens group and a second subsequent lens group, which are arranged in order from the object side to the image side. When the focal length of the first subsequent lens group is fr1 and the focal length of the second subsequent lens group is fr2, 0.10 ≦ |fr1| / |fr2| ≦ 10.0 The zoom lens according to any one of claims 1 to 3, characterized by satisfying the following conditional expression.

16. Among the lens groups constituting the zoom lens, each lens group that moves during zooming has a mechanism for electrically driving, the zoom lens according to any one of claims 1 to 3.

17. An imaging device, characterized by having the zoom lens according to any one of claims 1 to 3.

18. The imaging device according to claim 17, further comprising an imaging element that photoelectrically converts an optical image formed by the zoom lens.

Images