Zoom lens and imaging device

Abstract

This provides a zoom lens with a high zoom ratio, compact size, lightweight design, and high optical performance. [Solution] The zoom lens has a positive first lens group L1 that is stationary during zooming, an intermediate group including at least three lens groups L2 to L4 that move during zooming, and a rear lens group L5 that is stationary during zooming. The intermediate group includes at least two negative lens groups arranged in sequence. When νd is the Abbe number with respect to the d line of the positive lens closest to the object in the first lens group, Ok1 is the distance on the optical axis from the lens surface closest to the image of the first lens group to the rear principal point of the first lens group when in focus on an object at infinity, f1 is the focal length of the first lens group, and fN is the focal length of the lens group with the largest absolute value of refractive power among the at least two negative refractive power lens groups, the following conditions are satisfied: 75≦νd≦110, -0.45≦Ok1 / f1≦-0.15, and -9.0≦f1 / fN≦-4.0.

Description

Technical Field

[0001] The present invention relates to a zoom lens used in an imaging device.

Background Art

[0002] Zoom lenses are required to have a high zoom ratio, be small and lightweight, and have even higher optical performance. The zoom lens disclosed in Patent Document 1 includes a first lens group with a positive refractive power that is stationary for zooming, a second lens group with a negative refractive power that moves for zooming, and a third lens group with a negative refractive power that moves for zooming, which are arranged in order from the object side to the image side, and a rear lens group with a positive refractive power that is stationary for zooming.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] There is a need for a zoom lens that has a higher zoom ratio, is smaller and lighter, and has higher optical performance than the zoom lens disclosed in Patent Document 1.

Means for Solving the Problems

[0005] A zoom lens as one aspect of the present invention comprises a first lens group having a fixed positive refractive power arranged sequentially from the object side to the image side for zooming, an intermediate group including at least three lens groups that move for zooming, and a rear lens group that remains fixed for zooming, wherein the spacing between adjacent lens groups changes during zooming. The intermediate group includes at least two consecutively arranged lens groups having negative refractive power. The lens closest to the object in the first lens group is a positive lens. When the Abbe number with respect to the d line of the positive lens is νd, the distance on the optical axis from the lens surface closest to the image of the first lens group to the rear principal point of the first lens group when focused on an object at infinity is Ok1, the focal length of the first lens group is f1, and the focal length of the lens group with the largest absolute value of refractive power among the at least two negative refractive power lens groups is fN, 75≦νd≦110 -0.45 ≤ Ok1 / f1 ≤ -0.15 -9.0 ≤ f1 / fN ≤ -4.0 The conditions for this to happen, or, 75≦νd≦110 -0.45 ≤ Ok1 / f1 ≤ -0.15 The present invention is characterized by satisfying the following conditions. Furthermore, an imaging device that performs imaging through the above-mentioned zoom lens also constitutes another aspect of the present invention. [Effects of the Invention]

[0006] According to the present invention, it is possible to provide a zoom lens that is compact, lightweight, and has high optical performance while having a high zoom ratio. [Brief explanation of the drawing]

[0007] [Figure 1] Cross-sectional view of the zoom lens of Example 1. [Figure 2] Aberration diagram of the zoom lens in Example 1. [Figure 3] Cross-sectional view of the zoom lens of Example 2. [Figure 4] Aberration diagram of the zoom lens in Example 2. [Figure 5] Cross-sectional view of the zoom lens of Example 3. [Figure 6] Aberration diagram of the zoom lens in Example 3. [Figure 7] Cross-sectional view of the zoom lens of Example 4. [Figure 8] Aberration diagram of the zoom lens in Example 4. [Figure 9] Cross-sectional view of the zoom lens of Example 5. [Figure 10] Aberration diagram of the zoom lens in Example 5. [Figure 11] Schematic diagram of an imaging device equipped with a zoom lens according to Examples 1-5. [Modes for carrying out the invention]

[0008] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0009] Before describing specific examples 1 to 5, we will explain the points common to each example using Figure 1, which shows the zoom lens of Example 1. The zoom lenses of each example are used in various imaging devices such as broadcast cameras, cinema cameras, video cameras, surveillance cameras, digital still cameras, and silver halide film cameras. Figure 1 shows the configuration of the zoom lens of Example 1 at its wide-angle end and in focus on an object at infinity (hereinafter referred to as the infinity focus state). In the figure, the left side is the object side (front side), and the right side is the image side (back side).

[0010] In a zoom lens, a lens group is a collection of one or more lenses that move together or remain stationary during zooming (magnification) between the wide-angle and telephoto ends. That is, the distance between adjacent lens groups changes during zooming. The lens group may include an aperture diaphragm. The wide-angle and telephoto ends represent the zoom states at the maximum angle of view (shortest focal length) and minimum angle of view (longest focal length), respectively, when the lens group that moves during zooming is positioned at the ends of the range that is mechanically or controllly movable along the optical axis.

[0011] The zoom lens of each embodiment has a first lens group L1 having a positive refractive power that is stationary (does not move) for zooming, arranged in order from the object side to the image side, an intermediate group including at least three lens groups that move for zooming, and a rear lens group that is stationary for zooming. The zoom lens of each embodiment has a high zoom ratio of about 15 to 50 times.

[0012] The lens closest to the object side in the first lens group L1 is a positive lens.

[0013] The intermediate group includes at least two lens groups having negative refractive powers arranged continuously. Embodiments 1 to 3 include two lens groups L2 and L3 having negative refractive powers, and Embodiments 4 and 5 include three lens groups L2 to L4. Further, the intermediate group may include other lens groups that move during zooming. That is, the intermediate group includes at least two lens groups having negative refractive powers and at least one lens group having a positive refractive power. In the figure, the movement trajectories during zooming from the wide-angle end to the telephoto end for each lens group included in the intermediate group are indicated by arrows. The second lens group L2 closest to the image side in the intermediate group (and further the third lens group L3 in Embodiments 4 and 5) moves monotonically toward the image side during zooming from the wide-angle end to the telephoto end. The other lens groups in the intermediate group move non-monotonically during zooming so as to draw a convex-shaped trajectory toward at least one of the object side and the image side during zooming.

[0014] The rear lens group has a positive or negative refractive power. The aperture stop SP is stationary during zooming. IP is the image plane. On the image plane IP, the imaging surface (light-receiving surface) of the imaging device or the film surface (photosensitive surface) of the silver halide film is arranged. A glass block such as a prism or an optical filter may be arranged between the rear lens group LR and the image plane I.

[0015] In each embodiment of the zoom lens, the Abbe number with respect to the d line of the positive lens closest to the object in the first lens group L1 is νd, and the distance on the optical axis from the image-side lens surface of the first lens group L1 to the rear principal point of the first lens group L1 in the infinity focus state is Ok1. The focal length of the first lens group L1 is f1, and the focal length of the lens group with the largest absolute value of refractive power among at least two consecutively arranged lens groups with negative refractive power in the intermediate group is fN. In this case, the zoom lens in each embodiment is, 75≦νd≦110 (1) -0.45 ≤ Ok1 / f1 ≤ -0.15 (2) -9.0 ≤ f1 / fN ≤ -4.0 (3) It is preferable that the following conditions are satisfied. The Abbe number νd with respect to the d line is defined by νd = (Nd-1) / (NF-NC), where the refractive indices for the F line (wavelength 486.1 nm), the d line (wavelength 587.6 nm), and the C line (wavelength 656.3 nm) are NF, Nd, and NC, respectively.

[0016] The conditions in equations (1) to (3) indicate the appropriate range for the configuration of the zoom lens and the characteristics of the positive lens closest to the object in the first lens group L1. By satisfying the conditions in equations (1) and (2), it is possible to realize a zoom lens that is compact, lightweight, and has high optical performance despite having a high zoom ratio, as described above. Furthermore, by satisfying the condition in equation (3), it becomes easy to widen the angle of view.

[0017] If νd falls below the lower limit of equation (1), it becomes difficult to correct first-order axial chromatic aberration at the telephoto end, which is undesirable. If νd exceeds the limit of equation (1), it becomes difficult to correct field curvature at the telephoto end, which is also undesirable.

[0018] Furthermore, it is preferable to set the lower limit of formula (1) to 77, 79, or 81. It is even more preferable to set the upper limit of formula (1) to 105, 100, or 96.

[0019] If the focal length of the first lens group L1 becomes too short so that Ok1 / f1 falls below the lower limit of equation (2), it is undesirable because it becomes difficult to correct various aberrations, especially spherical aberration, at the telephoto end. If the focal length of the first lens group L1 becomes too long so that Ok1 / f1 exceeds the upper limit of equation (2), it is undesirable because the overall length of the zoom lens becomes long, making miniaturization difficult.

[0020] Furthermore, it is preferable to set the lower limit of equation (2) to -0.40, -0.35, or -0.30. It is also preferable to set the upper limit of equation (2) to -0.155 or -0.16. If f1 / fN falls below the lower limit of equation (3), the focal length of the lens group with the greatest absolute refractive power becomes too short, making it difficult to correct the field curvature that fluctuates with zooming, which is undesirable. If f1 / fN exceeds the upper limit of equation (3), the focal length of the lens group with the greatest absolute refractive power becomes too long, making it difficult to widen the angle of view and increase the zoom ratio, which is also undesirable.

[0021] Furthermore, it is more preferable to set the lower limit of equation (3) to -8.5, -8.0, or -7.8. It is even more preferable to set the upper limit of equation (3) to -4.2, -4.4, or -4.6, and it may also be set to -6.0.

[0022] Furthermore, it is preferable that the zoom lens of each embodiment satisfies at least one of the following conditions (4) to (8).

[0023] In each embodiment, when the focal length of the entire zoom lens system at the telephoto end is fT, 2.0 ≤ fT / f1 ≤ 9.0 (4) It is preferable that the following conditions be satisfied.

[0024] The condition in equation (4) indicates an appropriate ratio between the focal length of the zoom lens at its telephoto end and the focal length of the first lens group L1, that is, an appropriate magnification ratio for the first lens group L1. If fT / f1 falls below the lower limit of equation (4), the magnification ratio of the first lens group L1 becomes too small, making it difficult to widen the angle of view and increase the zoom ratio, which is undesirable. If fT / f1 exceeds the upper limit of equation (4), the magnification ratio of the first lens group L1 becomes too large, increasing the sensitivity of the first lens group L to coma aberration, which is also undesirable.

[0025] Furthermore, it is more preferable to set the lower limit of formula (4) to 2.4 or 2.8, and it may also be set to 5.0 or 5.5. It is more preferable to set the upper limit of formula (4) to 8.5, 8.0, 7.5, or 7.0.

[0026] In each embodiment, when the focal length of the positive lens closest to the object in the first lens group L1 is fp, 0.5 ≤ fp / f1 ≤ 4.0 (5) It is preferable that the following conditions be satisfied.

[0027] The conditions in equation (5) indicate an appropriate relationship between the focal length of the positive lens and the focal length of the first lens group L1. If the focal length of the positive lens becomes too short so that fp / f1 falls below the lower limit of equation (5), it becomes difficult to correct spherical aberration at the telephoto end, which is undesirable. If the focal length of the positive lens becomes too long so that fp / f1 exceeds the upper limit of equation (5), it becomes difficult to correct axial chromatic aberration at the telephoto end, which is also undesirable.

[0028] Furthermore, it is more preferable to set the lower limit of equation (5) to 1.0, 1.2, or 1.3. It is even more preferable to set the upper limit of equation (5) to 3.8, and it may also be 3.0, 2.0, or 1.6.

[0029] In the zoom lens of each embodiment, when R1 is the radius of curvature of the object-side surface of the positive lens closest to the object in the first lens group L1, and R2 is the radius of curvature of the image-side surface of the positive lens, 0.5≦(R2+R1) / (R2-R1)≦2.5 (6) It is preferable that the following conditions be satisfied.

[0030] The conditions in equation (6) indicate the appropriate shape factor (SF = (R2 + R1) / (R2 - R1)) for the above positive lens. If SF falls below the lower limit of equation (6), it is undesirable because it becomes difficult to correct various aberrations, especially spherical aberration, at the telephoto end. If SF exceeds the upper limit of equation (6), it is undesirable because it becomes difficult to achieve a long focal length at the telephoto end.

[0031] Furthermore, it is more preferable to set the lower limit of equation (6) to 0.55 or 0.58. It is even more preferable to set the upper limit of equation (6) to 2.4 or 2.2, and it may also be set to 1.0 or 0.8.

[0032] In each embodiment, when the focal length of the entire zoom lens system at the wide-angle end is fW, 15 ≤ fT / fW ≤ 50 (7) It is preferable that the following conditions be satisfied.

[0033] The conditions in equation (7) indicate the range of possible zoom ratios for the zoom lens in each embodiment. By setting the zoom ratio within the range of equation (7), a zoom lens that is advantageous in terms of wide angle of view and miniaturization can be realized.

[0034] Furthermore, it is more preferable to set the lower limit of equation (7) to 17, 19, or 20. It is even more preferable to set the upper limit of equation (7) to 48, 45, 42, or 40.

[0035] In the zoom lens of each embodiment, when the refractive index of the positive lens closest to the object in the first lens group L1 with respect to the d line is nd, 1.40 ≤ nd ≤ 1.55 (8) It is preferable that the following conditions be satisfied.

[0036] The conditions in equation (8) indicate an appropriate range for the refractive index of the positive lens. If nd falls below the lower limit of equation (8), the refractive index of the positive lens becomes too small, which is undesirable because it causes the first lens group L1 to become larger. If nd exceeds the upper limit of equation (8), the refractive index of the positive lens becomes too large, which is undesirable because it makes it difficult to correct aberrations at the telephoto end.

[0037] Furthermore, it is preferable to set the lower limit of equation (8) to 1.42 or 1.43. It is even more preferable to set the upper limit of equation (8) to 1.52 or 1.50.

[0038] Furthermore, it is preferable that the zoom lens of each embodiment has at least one of the following configurations.

[0039] In the zoom lens of each embodiment, it is preferable that the first lens group L1 is composed of a first partial lens group L11 and a second partial lens group L12, arranged in order from the object side, and that the second partial lens group L12 is moved for focusing. This reduces the amount of movement of the lens group for focusing and reduces the fluctuation of aberrations associated with the movement of the lens group, which is advantageous for improving the performance of the zoom lens.

[0040] In the diagrams showing the configuration of the zoom lens in each embodiment, the direction of movement of the second partial lens group L12 during focusing from infinity to near distance is indicated by an arrow labeled F. However, the entire first lens group L1 may also move during focusing.

[0041] In the zoom lens of each embodiment, it is preferable that the first lens group L1 is composed of a positive lens, a negative lens, a positive lens, a negative lens, and two positive lenses arranged in order from the object side to the image side. This makes it possible to achieve a wide angle of view at the wide-angle end and a high zoom ratio of the zoom lens while suppressing an increase in the overall length of the zoom lens.

[0042] The zoom lens of each embodiment is preferably composed of a first lens group L1 arranged in order from the object side to the image side, a second lens group L2 with negative refractive power, a third lens group L3 with negative refractive power, and a fourth lens group L4 with positive refractive power, all included in the intermediate group and moving for zooming, and a fifth lens group L5 as a rear lens group. Alternatively, it is preferable to be composed of a first lens group L1 arranged in order from the object side to the image side, a second lens group L2 with negative refractive power, a third lens group L3 with negative refractive power, a fourth lens group L4 with negative refractive power, and a fifth lens group L5 with positive refractive power, all included in the intermediate group and moving for zooming, and a sixth lens group L6 as a rear lens group.

[0043] The zoom lenses of Examples 1 to 5 will be described in detail below. Furthermore, numerical examples 1 to 5 corresponding to each of Examples 1 to 5 will be shown after Example 6.

[0044] In each numerical example, the surface number i indicates the order of the optical surfaces counted from the object side. In the surface data, r is the radius of curvature of the i-th surface (mm), d is the lens thickness or air gap between the i-th and (i+1)th surfaces (mm), and nd is the refractive index of the optical material between the i-th and (i+1)th surfaces with respect to the d-line. νd is the Abbe number with respect to the d-line of the optical material between the i-th and (i+1)th surfaces, and is defined as described above.

[0045] The focal length, F-number, and half-angle of view (°) are values ​​shown for when the lens is in focus at infinity. BF is the back focus (mm), which is the distance along the optical axis from the image-side lens surface (final surface) of the zoom lens to the paraxial image plane, expressed in air equivalent length. The total lens length (mm) is the distance along the optical axis from the object-side lens surface (frontmost) to the final surface of the zoom lens, plus the back focus.

[0046] The asterisk (*) next to the surface number indicates that the surface has an aspherical shape. The aspherical shape is expressed by the following formula, where X is the displacement from the surface vertex in the direction of the optical axis, H is the height from the optical axis in the direction perpendicular to the optical axis, the direction of light propagation is positive, R is the radius of paraxial curvature, K is the cone constant, and A4 to A16 are the aspherical coefficients. The cone constant and aspherical coefficients "e±Z" are "×10 ±Z It means "...".

[0047]

number

[0048] Table 1 summarizes the values ​​for equations (1) to (8) in each numerical example. Each numerical example satisfies all the conditions of equations (1) to (8). [Examples]

[0049] The zoom lens of Embodiment 1 (Numerical Example 1) shown in Figure 1 is composed of a first lens group L1 with a fixed positive refractive power for zooming, arranged in order from the object side to the image side, a second lens group L2 with negative refractive power, a third lens group L3 with negative refractive power, and a fourth lens group L4 with positive refractive power, each moving for zooming, and a fifth lens group L5 as a rear lens group with a fixed positive refractive power for zooming.

[0050] The first lens group L1 includes a first partial lens group L11 consisting of a positive lens, a negative lens, a positive lens, and a negative lens, arranged sequentially from the object side to the image side, and a second partial lens group L12 consisting of two positive lenses. The second partial lens group L12 moves towards the object side for focusing from infinity to near distance.

[0051] The second lens group L2 is a variator that moves monotonically toward the image side when zooming from the wide-angle end to the telephoto end. The third lens group L3 and the fourth lens group L4 are compensators that move non-monotonically when zooming. The fifth lens group L5 includes the aperture diaphragm SP. Optical units such as extender lenses for changing the focal length may be inserted into or removed from the air gap within the fifth lens group L5.

[0052] Figure 2 shows the longitudinal aberrations (spherical aberration, astigmatism, distortion, and chromatic aberration) of the zoom lens of Numerical Example 1 at the (A) wide-angle end and (B) telephoto end when in focus at infinity. The spherical aberration diagram shows the spherical aberration at the d line (wavelength 587.6 nm), g line (wavelength 435.8 nm), C line (wavelength 656.3 nm), and F line (wavelength 486.1 nm), respectively, indicated by solid, dashed, single-dotted, and dashed lines. The astigmatism diagram shows the astigmatism at the meridional image plane M and sagittal image plane S, respectively, indicated by dashed and solid lines. The distortion diagram shows the distortion at the d line. The chromatic aberration diagram shows the lateral chromatic aberration at the d line, g line, C line, and F line, respectively, indicated by solid, dashed, single-dotted, and dashed lines. Fno represents the F number, and ω represents the half-angle (°).

[0053] The full scale of the horizontal axis in the spherical aberration diagram is ±0.400 mm, and the full scale of the horizontal axis in the astigmatism diagram is also ±0.400 mm. The full scale of the horizontal axis in the distortion diagram is ±5.000%. The full scale of the horizontal axis in the chromatic aberration diagram is ±0.100 mm. The above explanations for the aberration diagrams are the same for the other numerical examples described later. [Examples]

[0054] Figure 3 shows the configuration of the zoom lens of Example 2 (Numerical Example 2) at infinity focus and wide-angle end. The zoom lens of this example is composed of a first lens group L1 with a fixed positive refractive power for zooming, arranged in order from the object side to the image side; a second lens group L2, a third lens group L3 with negative refractive power, and a fourth lens group L4 with positive refractive power, each moving for zooming; and a fifth lens group L5 as a rear lens group with a fixed negative refractive power for zooming.

[0055] The first lens group L1 includes a first partial lens group L11 consisting of a positive lens, a negative lens, a positive lens, and a negative lens, arranged sequentially from the object side to the image side, and a second partial lens group L12 consisting of two positive lenses. The second partial lens group L12 moves towards the object side for focusing from infinity to near distance.

[0056] The second lens group L2 is a variator that moves monotonically toward the image side when zooming from the wide-angle end to the telephoto end. The third lens group L3 and the fourth lens group L4 are compensators that move non-monotonically when zooming. The fifth lens group L5 includes the aperture diaphragm SP. Optical units such as extender lenses for changing the focal length may be inserted into or removed from the air gap within the fifth lens group L5.

[0057] Figure 4 shows the longitudinal aberrations at the wide-angle end (A) and the telephoto end (B) of the zoom lens of numerical example 2 when it is in focus at infinity. [Examples]

[0058] Figure 5 shows the configuration of the zoom lens of Example 3 (Numerical Example 3) at infinity focus and wide-angle end. The zoom lens of this example is composed of a first lens group L1 with a fixed positive refractive power for zooming, arranged in order from the object side to the image side; a second lens group L2, a third lens group L3 with negative refractive power, and a fourth lens group L4 with positive refractive power, each moving for zooming; and a fifth lens group L5 as a rear lens group with a fixed positive refractive power for zooming.

[0059] The first lens group L1 includes a first partial lens group L11 consisting of a positive lens, a negative lens, a positive lens, and a negative lens, arranged sequentially from the object side to the image side, and a second partial lens group L12 consisting of two positive lenses. The second partial lens group L12 moves towards the object side for focusing from infinity to near distance.

[0060] The second lens group L2 is a variator that moves monotonically toward the image side when zooming from the wide-angle end to the telephoto end. The third lens group L3 and the fourth lens group L4 are compensators that move non-monotonically when zooming. The fifth lens group L5 includes the aperture diaphragm SP. Optical units such as extender lenses for changing the focal length may be inserted into or removed from the air gap within the fifth lens group L5.

[0061] Figure 6 shows the longitudinal aberrations at the wide-angle end (A) and the telephoto end (B) of the zoom lens in numerical example 3 when it is in focus at infinity. [Examples]

[0062] Figure 7 shows the configuration of the zoom lens of Example 4 (Numerical Example 4) at infinity focus and wide-angle end. The zoom lens of this example is composed of a first lens group L1 with a fixed positive refractive power arranged in order from the object side to the image side, a second lens group L2, a third lens group L3, a fourth lens group L4, and a fifth lens group L5 with a positive refractive power, each moving for zooming, and a sixth lens group L6 as a rear lens group with a fixed positive refractive power for zooming.

[0063] The first lens group L1 includes a first partial lens group L11 consisting of a positive lens, a negative lens, and a positive lens, arranged in order from the object side to the image side, and a second partial lens group L12 consisting of three positive lenses. The second partial lens group L12 moves towards the object side for focusing from infinity to near distance.

[0064] The second lens group L2 and the third lens group L3 are variators that move monotonically toward the image side when zooming from the wide-angle end to the telephoto end. The fourth lens group L4 and the fourth lens group L5 are compensators that move non-monotonically when zooming. The sixth lens group L6 includes the aperture diaphragm SP. Optical units such as extender lenses for changing the focal length may be inserted into or removed from the air gap within the sixth lens group L6.

[0065] Furthermore, the second lens group L2 and the third lens group L3 move monotonically toward the image side while their distance from the wide-angle end to the telephoto end changes slightly (smaller than the change in distance between other lens groups). These second lens group L2 and the third lens group L3 may be treated as two sub-lens groups that constitute a single second lens group. In this case, the fourth to sixth lens groups L4 to L6 become the third to fifth lens groups, respectively. This is also the case in Example 5, which will be described later.

[0066] Figure 8 shows the longitudinal aberrations at the wide-angle end (A) and the telephoto end (B) of the zoom lens of numerical example 4 when it is in focus at infinity. [Examples]

[0067] Figure 9 shows the configuration of the zoom lens of Example 5 (Numerical Example 5) at infinity focus and wide-angle end. The zoom lens of this example is composed of a first lens group L1 with a fixed positive refractive power for zooming, arranged in order from the object side to the image side; a second lens group L2, a third lens group L3, a fourth lens group L4, and a fifth lens group L5 with a positive refractive power, each moving for zooming; and a sixth lens group L6 as a rear lens group with a fixed positive refractive power for zooming.

[0068] The first lens group L1 includes a first partial lens group L11 consisting of a positive lens, a negative lens, a positive lens, and a positive lens, arranged in order from the object side to the image side, and a second partial lens group L12 consisting of two positive lenses. The second partial lens group L12 moves towards the object side for focusing from infinity to near distance.

[0069] The second lens group L2 and the third lens group L3 are variators that move monotonically toward the image side when zooming from the wide-angle end to the telephoto end. The fourth lens group L4 and the fourth lens group L5 are compensators that move non-monotonically when zooming. The sixth lens group L6 includes the aperture diaphragm SP. Optical units such as extender lenses for changing the focal length may be inserted into or removed from the air gap within the sixth lens group L6.

[0070] Figure 10 shows the longitudinal aberrations at the wide-angle end (A) and the telephoto end (B) of the zoom lens of numerical example 5 when it is in focus at infinity. [Numerical Example 1] Unit: mm Surface data Face number rd nd νd 1 161.551 16.13 1.49700 81.5 2 -948.095 0.20 3 171.346 4.00 1.77250 49.6 4 100.435 3.60 5 104.049 16.19 1.43387 95.1 6 1685.391 8.56 7 -251.961 3.20 1.72916 54.7 8 388.842 15.63 9 321.287 12.18 1.43387 95.1 10 -232.884 0.15 11 145.177 9.40 1.43387 95.1 12 968.682 (variable) 13* -295.187 1.20 1.59522 67.7 14 33.348 6.82 15 -65.974 1.00 1.59522 67.7 16 27.520 8.50 1.72047 34.7 17 -47.897 2.47 18 -30.076 1.20 1.77250 49.6 19 984.542 (variable) 20 -69.448 1.00 1.77250 49.6 21 129.752 3.26 1.92119 24.0 22 -2436.113 (variable) 23* 294.629 7.12 1.43875 94.7 24 -63.833 0.20 25 50.902 1.20 2.05090 26.9 26 40.772 7.63 1.59522 67.7 27 138.945 (variable) 28 105.524 5.94 1.51860 69.9 29 -126.376 0.20 30 59.773 5.68 1.43875 94.7 31 -1164.171 1.20 2.00100 29.1 32 147.018 4.04 33 (aperture) ∞ 31.31 34 -515.221 4.22 1.80810 22.8 35 -22.458 0.80 1.95375 32.3 36 99.786 37.60 37 47.943 6.76 1.51860 69.9 38 -35.664 0.17 39 -108.641 4.05 1.60342 38.0 40 -29.497 1.00 1.88300 40.8 41 27.303 1.80 42 29.813 11.40 1.76182 26.5 43 -19.084 1.00 2.00100 29.1 44 83.726 0.64 45 52.520 9.09 1.64769 33.8 46 -26.930 1.10 1.98612 16.5 47 -38.388 49.90 Image plane ∞ Aspherical data Page 13 K =-1.18082e+00 A 4= 4.07830e-06 A 6= 7.17765e-10 A 8=-5.40864e-12 A10= 5.06878e-14 A12=-1.25398e-16 A14= 1.04671e-19 A16= 6.53328e-23 Page 23 K = 0.00000e+00 A 4=-1.12738e-06 A 6= 2.39065e-11 A 8=-1.48685e-13 Various data Zoom ratio 30.00 Wide-angle, Medium, Telephoto Focal length 40.00 184.53 1200.00 F-number 4.60 4.60 10.00 Half-angle (°): 20.30 4.59 0.71 Image height 14.80 14.80 14.80 Lens length 455.16 455.16 455.16 BF 49.90 49.90 49.90 d12 1.68 83.28 121.68 d19 116.23 13.38 7.06 d22 13.29 36.89 1.96 d27 15.22 12.87 15.72 d47 49.90 49.90 49.90 Lens group data Group starting plane focal length 1 1 195.06 2 13 -25.06 3 20 -104.35 4 23 71.04 5 28 253.10 [Numerical Example 2] Unit: mm Surface data Face number rd nd νd 1 133.310 21.14 1.43387 95.1 2 -526.944 0.20 3 127.752 4.00 1.77250 49.6 4 86.167 4.35 5 92.338 16.78 1.43387 95.1 6 866.218 13.45 7 -199.364 3.20 1.72916 54.7 8 304.007 11.48 9 282.239 12.18 1.43387 95.1 10 -191.533 0.15 11 118.518 10.07 1.43875 94.9 12 1412.982 (variable) 13* 626.418 1.20 1.83481 42.7 14 31.266 7.86 15 -43.210 1.00 1.43875 94.7 16 33.794 5.47 1.73800 32.3 17 -89.445 3.42 18 -26.173 1.20 1.43875 94.7 19 108.512 (variable) 20 97.245 2.86 1.76182 26.5 21 196.047 2.94 22 -150.729 1.20 1.75500 52.3 23 210.803 (variable) 24* 58.793 8.51 1.43875 94.7 25 -79.975 0.20 26 124.772 1.20 2.00069 25.5 27 50.824 7.03 1.77250 49.6 28 -581.703 (variable) 29 22.816 5.48 1.43875 94.7 30 34.675 0.20 31 27.670 1.20 2.00100 29.1 32 23.745 8.70 33 (aperture) ∞ 15.66 34 56.207 6.45 1.80810 22.8 35 -19.451 0.80 2.00100 29.1 36 57.921 37.60 37 58.783 5.49 1.54814 45.8 38 -33.898 0.17 39 -77.999 3.30 1.62004 36.3 40 -32.056 1.00 1.88300 40.8 41 47.311 1.16 42 39.153 8.54 1.63980 34.5 43 -19.138 1.00 2.00100 29.1 44 67.881 0.91 45 49.194 6.08 1.63980 34.5 46 -41.769 43.98 Image plane ∞ Aspherical data Page 13 K = 2.01991e+00 A 4= 3.24019e-06 A 6= 6.68661e-10 A 8= 2.03340e-11 A10=-1.66727e-13 A12= 7.84854e-16 A14=-1.65971e-18 A16= 1.35703e-21 Page 24 K = 0.00000e+00 A 4=-2.17230e-06 A 6= 8.06830e-11 A 8= 1.39805e-13 Various data Zoom ratio 19.99 Wide-angle, Medium, Telephoto Focal length 50.00 176.60 999.36 F-number 4.60 4.60 8.55 Half-angle (°): 16.49 4.79 0.85 Image height 14.80 14.80 14.80 Lens length 400.40 400.40 400.40 BF 43.98 43.98 43.98 d12 2.59 56.99 82.59 d19 105.01 12.69 1.96 d23 2.00 38.98 1.94 d28 1.98 2.92 25.09 d46 43.98 43.98 43.98 Lens group data Group starting plane focal length 1 1 163.71 2 13 -22.54 3 20 -228.07 4 24 57.83 5 29 -603.34 [Numerical Example 3] Unit: mm Surface data Face number rd nd νd 1 160.363 16.21 1.49700 81.5 2 -789.513 0.20 3 165.662 4.00 1.77250 49.6 4 99.928 3.57 5 103.373 15.00 1.43387 95.1 6 762.000 11.55 7 -242.547 3.20 1.72916 54.7 8 366.855 16.41 9 361.413 11.80 1.43387 95.1 10 -220.022 0.15 11 146.506 9.67 1.43875 94.9 12 1341.013 (variable) 13* -145.353 1.20 1.53775 74.7 14 31.534 6.22 15 -70.009 1.00 1.52841 76.5 16 30.782 7.03 1.76634 35.8 17 -62.868 1.87 18 -39.946 1.20 1.77250 49.6 19 117.269 (variable) 20 -68.392 1.00 1.72916 54.7 21 142.635 3.11 1.92119 24.0 22 2987.046 (Variable) 23* 51.791 10.29 1.43875 94.7 24* -92.944 (variable) 25 101.269 8.58 1.48749 70.2 26 -69.900 0.20 27 115.977 7.92 1.43875 94.7 28 -57.389 1.20 2.00100 29.1 29 -221.465 7.59 30 (aperture) ∞ 30.96 31 129.704 4.34 1.80810 22.8 32 -28.640 0.80 1.95375 32.3 33 48.513 37.60 34 52.241 7.75 1.51633 64.1 35 -37.812 0.16 36 -111.053 4.75 1.60342 38.0 37 -27.496 1.00 1.88300 40.8 38 32.716 1.56 39 33.408 10.71 1.85478 24.8 40 -21.733 1.00 2.00100 29.1 41 48.205 1.21 42 43.954 10.39 1.60342 38.0 43 -24.443 1.10 1.95906 17.5 44 -35.431 47.09 Image plane ∞ Aspherical data Page 13 K = 1.98235e+00 A 4= 3.46474e-06 A 6=-1.08846e-09 A 8= 1.60965e-12 A10=-2.29039e-15 A12= 2.12071e-17 A14=-5.50356e-20 A16= 4.35851e-23 Page 23 K = 0.00000e+00 A 4=-1.79332e-06 A 6= 5.48389e-10 A 8=-2.57959e-13 Page 24 K = 0.00000e+00 A 4= 1.09898e-06 A 6= 4.54644e-10 A 8= 6.59687e-14 Various data Zoom ratio 25.00 Wide-angle, Medium, Telephoto Focal length 45.00 202.95 1125.00 F-number 4.60 4.60 9.62 Half-angle (°): 18.21 4.17 0.75 Image height 14.80 14.80 14.80 Lens length 455.25 455.25 455.25 BF 47.09 47.09 47.09 d12 2.55 84.12 122.51 d19 113.58 12.71 8.82 d22 10.88 33.61 1.95 d24 17.67 14.23 11.38 d44 47.09 47.09 47.09 Lens group data Group starting plane focal length 1 1 200.16 2 13 -26.47 3 20 -103.93 4 23 77.48 5 25 201.58 [Numerical Example 4] Unit: mm Surface data Face number rd nd νd 1 165.278 8.63 1.43875 94.7 2 447.341 1.00 3 224.557 3.00 1.88300 40.8 4 113.131 1.07 5 111.367 18.05 1.43387 95.1 6 -1770.815 11.15 7 134.761 7.11 1.43387 95.1 8 278.253 0.20 9 104.639 6.83 1.43387 95.1 10 175.720 0.20 11 151.404 5.61 1.43387 95.1 12 293.076 (variable) 13 53.024 1.00 2.00100 29.1 14 23.872 9.21 15 -38.340 0.90 1.72916 54.7 16 68.260 0.70 17 32.411 6.01 1.80810 22.8 18 -53.129 (variable) 19 -37.807 1.10 1.77250 49.6 20 41.099 (variable) 21 -122.526 1.30 1.80100 35.0 22 54.859 4.14 1.84649 23.9 23 422.084 (variable) 24 -801.904 2.96 1.76634 35.8 25 -124.440 0.15 26 54.741 2.93 1.78472 25.7 27 82.124 (Variable) 28 (aperture) ∞ 1.00 29 119.635 9.43 1.43875 94.7 30 -60.297 1.50 1.96300 24.1 31 -71.898 0.15 32 70.190 8.31 1.43875 94.7 33 -56.400 1.50 2.00100 29.1 34 -729.027 50.00 35 80.558 4.64 1.56732 42.8 36 -50.990 2.54 37 -42.988 1.20 1.83481 42.7 38 29.452 6.50 1.63980 34.5 39 -32.935 2.01 40 -123.374 5.44 1.64769 33.8 41 -23.536 1.20 2.00100 29.1 42 -529.847 0.67 43 31.106 4.04 1.61800 63.3 44 184.270 3.80 45 ∞ 34.37 1.60859 46.4 46 ∞ 13.75 1.51680 64.2 47 ∞ 7.00 Image plane ∞ Various data Zoom ratio 39.85 Wide-angle, Medium, Telephoto Focal length 11.02 40.03 439.03 F-number 2.10 2.08 4.09 Half-angle (°): 26.53 7.82 0.72 Image height 5.50 5.50 5.50 Lens length 402.69 402.69 402.69 BF 7.00 7.00 7.00 d12 1.37 63.39 103.71 d18 0.88 1.53 1.91 d20 134.59 32.85 33.74 d23 10.04 39.21 10.02 d27 3.50 13.41 1.00 d47 7.00 7.00 7.00 Lens group data Group starting plane focal length 1 1 155.53 2 13 -155.59 3 19 -25.34 4 21 -129.12 5 24 97.06 6 28 83.50 [Numerical Example 5] Unit: mm Surface data Face number rd nd νd 1 180.137 15.28 1.49700 81.5 2 -789.237 0.20 3 198.814 4.00 1.77250 49.6 4 112.942 3.46 5 116.871 14.26 1.43387 95.1 6 1241.126 8.75 7 -251.002 3.20 1.72916 54.7 8 506.225 18.11 9 385.502 11.64 1.43387 95.1 10 -241.896 0.15 11 150.904 9.72 1.43875 94.9 12 1094.599 (variable) 13* -484.077 1.20 1.43875 94.7 14 34.038 7.44 15 -170.791 1.00 1.72916 54.7 16 24.472 10.03 1.76634 35.8 17 -94.125 (variable) 18 -32.819 1.20 1.72916 54.7 19* 2578.580 (variable) 20 -113.177 1.00 1.77250 49.6 21 55.549 4.74 1.78880 28.4 22 -176.378 2.12 23 -64.063 1.20 1.88300 40.8 24 -379.478 (variable) 25* 494.977 8.41 1.43875 94.7 26 -57.733 0.20 27 59.015 1.20 2.00069 25.5 28 48.014 7.41 1.59522 67.7 29 126.247 (variable) 30 84.799 8.13 1.49700 81.5 31 -127.181 0.20 32 54.553 7.37 1.43875 94.7 33 -504.241 1.20 2.00100 29.1 34 189.224 3.96 35 (aperture) ∞ 29.33 36 242.230 4.79 1.80810 22.8 37 -24.515 0.80 1.95375 32.3 38 48.987 37.60 39 58.665 7.22 1.48749 70.2 40 -28.824 0.14 41 -83.714 4.52 1.62588 35.7 42 -22.600 1.00 1.88300 40.8 43 28.400 1.59 44 29.985 10.75 1.78472 25.7 45 -16.678 1.00 2.00100 29.1 46 62.135 0.73 47 44.975 10.62 1.63980 34.5 48 -22.382 1.10 1.95906 17.5 49 -31.899 47.86 Image plane ∞ Aspherical data Page 13 K = 2.03811e+00 A 4= 4.46960e-06 A 6=-3.73984e-09 A 8= 3.24444e-11 A10=-1.53241e-13 A12= 4.01107e-16 A14=-5.27746e-19 A16= 2.79747e-22 Page 19 K = 0.00000e+00 A 4= 1.70977e-07 A 6=-9.87190e-09 A 8= 2.03848e-10 A10=-2.27112e-12 A12= 1.35250e-14 A14=-4.07636e-17 A16= 4.89496e-20 Page 25 K = 0.00000e+00 A 4=-1.01951e-06 A 6= 6.03432e-11 A 8=-1.16440e-13 Various data Zoom ratio 37.50 Wide-angle, Medium, Telephoto Focal length 40.00 197.63 1500.00 F-number 4.67 4.67 12.95 Half-angle (°): 20.30 4.28 0.57 Image height 14.80 14.80 14.80 Lens length 480.70 480.70 480.70 BF 47.86 47.86 47.86 d12 1.25 93.75 137.29 d17 5.36 4.02 3.90 d19 109.64 12.76 2.96 d24 25.06 38.68 1.86 d29 23.55 15.63 18.84 d49 47.86 47.86 47.86 Lens group data Group starting plane focal length 1 1 210.69 2 13 -143.37 3 18 -44.44 4 20 -73.06 5 25 78.18 6 30 241.93

[0071] [Table 1]

[0072] [Imaging device] Figure 11 shows an example configuration of the imaging device 125. In Figure 11, 101 is a zoom lens from one of Examples 1 to 5. 124 is the camera body. The zoom lens 101 is detachable from the camera body 124. In this figure, the first lens group U1 is shown as lens group F, the intermediate group as lens group LZ, and the rear lens group as lens group R. SP is the aperture diaphragm. 114 and 115 are drive mechanisms that drive the lens group that moves for focusing and the lens group LZ that moves for zooming, respectively, and include helicoids, cams, etc. 116-118 are motors (actuators) that drive the drive mechanisms 114 and 115 and the aperture diaphragm SP. 119-121 are detectors for detecting the position of the lens group for focusing and the lens group LZ, and the aperture diameter of the aperture diaphragm SP, and are composed of encoders, potentiometers, photosensors, etc.

[0073] In the camera body 124, 109 is a glass block such as a prism or optical filter. 110 is an image sensor, such as a CCD sensor or CMOS sensor, which is a photoelectric conversion element that converts the subject image formed by the zoom lens 101 into photoelectric data (imaging the subject through the zoom lens 101). 111 and 122 are processing units that perform various processes and controls in the camera body 124 and the zoom lens 101, respectively, and include a processor such as a CPU.

[0074] By using the zoom lenses described in Examples 1 to 5 above, a compact and lightweight imaging device 125 that can obtain good captured images can be provided.

[0075] The embodiment described above includes the following configuration.

[0076] (Composition 1) A zoom lens having a first lens group arranged sequentially from the object side to the image side and having a fixed positive refractive power for zooming, an intermediate group including at least three lens groups that move for zooming, and a rear lens group that remains fixed for zooming, wherein the spacing between adjacent lens groups changes during zooming, The intermediate group includes at least two groups of lenses having negative refractive power arranged in succession. The lens closest to the object in the first lens group is a positive lens. When νd is the Abbe number with respect to the d line of the positive lens, Ok1 is the distance on the optical axis from the image-side lens surface of the first lens group to the rear principal point of the first lens group when in focus on an object at infinity, f1 is the focal length of the first lens group, and fN is the focal length of the lens group with the largest absolute value of refractive power among the at least two lens groups having negative refractive power, 75≦νd≦110 -0.45 ≤ Ok1 / f1 ≤ -0.15 -9.0 ≤ f1 / fN ≤ -4.0 A zoom lens characterized by satisfying the following conditions. (Configuration 2) When the focal length of the zoom lens at the telephoto end is fT, 2.0 ≤ fT / f1 ≤ 9.0 A zoom lens according to configuration 1, characterized by satisfying the following conditions. (Composition 3) When the focal length of the positive lens in the first lens group is fp, 0.5 ≤ fp / f1 ≤ 4.0 A zoom lens according to configuration 1 or 2, characterized by satisfying the following conditions. (Composition 4) When the radius of curvature of the object-side surface of the positive lens in the first lens group is R1, and the radius of curvature of the image-side surface of the positive lens is R2, 0.5 ≤ (R2 + R1) / (R2 - R1) ≤ 2.5 A zoom lens according to any one of configurations 1 to 3, characterized by satisfying the following conditions. (Composition 5) When the focal length of the zoom lens at the wide-angle end is fW and the focal length of the zoom lens at the telephoto end is fT, 15 ≤ fT / fW ≤ 50 A zoom lens according to any one of configurations 1 to 4, characterized by satisfying the following conditions. (Composition 6) When the refractive index of the positive lens in the first lens group with respect to the d line is nd, 1.40 ≤ nd ≤ 1.55 A zoom lens according to any one of configurations 1 to 5, characterized by satisfying the following conditions. (Composition 7) The first lens group comprises a first partial lens group and a second partial lens group, arranged sequentially from the object side to the image side. The zoom lens according to any one of configurations 1 to 6, characterized in that the second partial lens group moves toward the object for focusing from infinity to near distance. (Composition 8) The zoom lens according to any one of configurations 1 to 7, characterized in that the first lens group is composed of a positive lens, a negative lens, a positive lens, a negative lens, and two positive lenses, arranged in order from the object side to the image side. (Composition 9) A zoom lens according to any one of configurations 1 to 8, characterized in that it comprises a first lens group arranged in order from the object side to the image side, a second lens group with negative refractive power, a third lens group with negative refractive power, and a fourth lens group with positive refractive power, which are included in the intermediate group and move for zooming, respectively, and a fifth lens group as the rear lens group. (Composition 10) A zoom lens according to any one of configurations 1 to 8, characterized in that it comprises a first lens group arranged in order from the object side to the image side, a second lens group with negative refractive power, a third lens group with negative refractive power, a fourth lens group with negative refractive power, and a fifth lens group with positive refractive power, all included in the intermediate group and moving for zooming, and a sixth lens group L6 as the rear lens group. (Composition 11) A zoom lens having a first lens group arranged sequentially from the object side to the image side and having a fixed positive refractive power for zooming, an intermediate group including at least three lens groups that move for zooming, and a rear lens group that remains fixed for zooming, wherein the spacing between adjacent lens groups changes during zooming, The intermediate group includes at least two groups of lenses having negative refractive power arranged in succession. The lens closest to the object in the first lens group is a positive lens. When the Abbe number with respect to the d line of the positive lens is νd, the distance on the optical axis from the image-side lens surface of the first lens group to the rear principal point of the first lens group when in focus on an object at infinity is Ok1, and the focal length of the first lens group is f1, 75≦νd≦110 -0.45 ≤ Ok1 / f1 ≤ -0.15 A zoom lens characterized by satisfying the following conditions. (Composition 12) A zoom lens described in any one of configurations 1 to 11, An imaging device characterized by having an image sensor that captures an image of a subject through the aforementioned zoom lens.

[0077] The embodiments described above are merely representative examples, and various modifications and changes can be made to each embodiment when implementing the present invention. [Explanation of symbols]

[0078] L1 First lens group L2 Second lens group L3 Third lens group L4 4th lens group L5 5th lens group L6 6th lens group SP aperture diaphragm IP image plane

Claims

1. A zoom lens having a first lens group arranged sequentially from the object side to the image side and having a fixed positive refractive power for zooming, an intermediate group including at least three lens groups that move for zooming, and a rear lens group that remains fixed for zooming, wherein the spacing between adjacent lens groups changes during zooming, The intermediate group includes at least two groups of lenses having negative refractive power arranged in succession. The lens closest to the object in the first lens group is a positive lens. When νd is the Abbe number with respect to the d line of the positive lens, OK1 is the distance on the optical axis from the image-side lens surface of the first lens group to the rear principal point of the first lens group when in focus on an object at infinity, f1 is the focal length of the first lens group, and fN is the focal length of the lens group with the largest absolute value of refractive power among the at least two lens groups having negative refractive power, 75 ≤ νd ≤ 110 -0.45 ≤ OK1 / f1 ≤ -0.15 -9.0 ≤ f1 / fN ≤ -4.0 A zoom lens characterized by satisfying the following conditions.

2. When the focal length of the zoom lens at the telephoto end is ftT, 2.0 ≤ fT / f1 ≤ 9.0 The zoom lens according to claim 1, characterized by satisfying the following conditions.

3. When the focal length of the positive lens in the first lens group is fp, 0.5 ≤ fp / f1 ≤ 4.0 The zoom lens according to claim 1, characterized by satisfying the following conditions.

4. When the radius of curvature of the object-side surface of the positive lens in the first lens group is R1, and the radius of curvature of the image-side surface of the positive lens is R2, 0.5≦(R2+R1) / (R2-R1)≦2.5 The zoom lens according to claim 1, characterized by satisfying the following conditions.

5. When the focal length of the zoom lens at the wide-angle end is fW and the focal length of the zoom lens at the telephoto end is ftT, 15 ≤ fT / fW ≤ 50 The zoom lens according to claim 1, characterized by satisfying the following conditions.

6. When the refractive index of the positive lens in the first lens group with respect to the d line is nd, 1.40 ≤ nd ≤ 1.55 The zoom lens according to claim 1, characterized by satisfying the following conditions.

7. The first lens group comprises a first partial lens group and a second partial lens group, arranged sequentially from the object side to the image side. The zoom lens according to claim 1, characterized in that the second partial lens group moves toward the object for focusing from infinity to near distance.

8. The zoom lens according to claim 1, characterized in that the first lens group is composed of a positive lens, a negative lens, a positive lens, a negative lens, and two positive lenses, arranged in order from the object side to the image side.

9. The zoom lens according to claim 1, characterized in that it comprises a first lens group arranged in order from the object side to the image side, a second lens group with negative refractive power, a third lens group with negative refractive power, and a fourth lens group with positive refractive power, which are included in the intermediate group and move for zooming, respectively, and a fifth lens group as the rear lens group.

10. The zoom lens according to claim 1, characterized in that it comprises a first lens group arranged in order from the object side to the image side, a second lens group with negative refractive power, a third lens group with negative refractive power, a fourth lens group with negative refractive power, and a fifth lens group with positive refractive power, which are included in the intermediate group and move for zooming, and a sixth lens group L6 as the rear lens group.

11. A zoom lens having a first lens group arranged sequentially from the object side to the image side and having a fixed positive refractive power for zooming, an intermediate group including at least three lens groups that move for zooming, and a rear lens group that remains fixed for zooming, wherein the spacing between adjacent lens groups changes during zooming, The intermediate group includes at least two groups of lenses having negative refractive power arranged in succession. The lens closest to the object in the first lens group is a positive lens. When the Abbe number with respect to the d line of the positive lens is νd, the distance on the optical axis from the image-side lens surface of the first lens group to the rear principal point of the first lens group when in focus on an object at infinity is OK1, and the focal length of the first lens group is f1, 75 ≤ νd ≤ 110 -0.45 ≤ OK1 / f1 ≤ -0.15 A zoom lens characterized by satisfying the following conditions.

12. A zoom lens according to any one of claims 1 to 11, An imaging device characterized by having an image sensor that captures an image of a subject through the aforementioned zoom lens.

Images