JP2017026985A - Conversion lens and image capturing device having the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conversion lens which allows for using combinations of exchangeable lens and image capturing device of different formats and offers anti-shake capability, and to provide an image capturing device having the same.SOLUTION: A conversion lens is designed to allow an image capturing optical system, which is usable with a first image capturing device having a plurality of first image sensors as an exchangeable lens, to be used with a second image capturing device having a second image sensor by being placed between the image capturing optical system and the second image sensor. The conversion lens has a negative lens on the most object side and at least two positive lenses on the image side of the negative lens, and is configured to provide an anti-shake effect by moving a part of or the entire conversion lens in a direction perpendicular to an optical axis.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a conversion lens and an image pickup apparatus having the same, and is suitable for, for example, a broadcast television camera, a video camera, a digital still camera, a surveillance camera, a silver salt photography camera, and the like.

Conventionally, in broadcast TV cameras, video cameras, digital still cameras, surveillance cameras, silver halide photography cameras, etc., there is a conversion lens that is placed between the interchangeable lens and the imaging device to increase the focal length of the interchangeable lens. Are known. In addition, there is known a conversion lens to which a vibration isolating function is added by moving a part or the whole of the optical system in a direction perpendicular to the optical axis. (Patent Documents 1 and 2)
In Patent Document 1, the image forming magnification is 1.1 to 1.3, and a 2/3 inch having a color separation optical system in which a part of the optical system is moved in a direction perpendicular to the optical axis to add an anti-vibration function. A conversion lens suitable for format cameras is proposed.

  In Patent Document 2, an imaging magnification of 1.1 to 1.8, a silver salt photographic camera having a diagonal length of 43.2 mm, in which the entire optical system is moved in a direction perpendicular to the optical axis and an anti-vibration function is added. A suitable conversion lens is proposed.

JP-A-11-258499 Japanese Patent Laid-Open No. 7-27975

  In recent years, in broadcast television cameras, video cameras, digital still cameras, surveillance cameras, silver halide photography cameras, and the like, it is desired to achieve both high pixels and high sensitivity, and the size of the image sensor is increasing. Along with the increase in the size of the image sensor, image shake such as camera shake is conspicuous, and thus it has been desired to have an anti-vibration function. On the other hand, among users who have a large number of existing interchangeable lenses, a conversion lens that can use the existing interchangeable lenses for imaging devices of different formats has been desired. For example, there is a need to use a 2/3 inch format interchangeable lens for an image pickup apparatus of a super 35 mm format having a larger image pickup device. In this case, an optical system that makes the focal length of the interchangeable lens longer is disposed between the interchangeable lens and the image sensor, and the image circle of the interchangeable lens needs to be enlarged.

  The interchangeable lens of 2/3 inch format is designed on the assumption of an image pickup apparatus having a color separation optical system. Therefore, in order to attach to a single-plate imaging device like the super 35 mm format, it is necessary to correct aberrations, mainly spherical aberration and axial chromatic aberration.

  The conversion lenses disclosed in Patent Documents 1 and 2 have an anti-vibration function, but only have a long focus on an imaging device of the same format. Therefore, the correction is not performed by removing the above-described color separation optical system, and the aberration correction is not performed considering the enlargement of the image circle, and therefore it cannot be attached to a different format.

  It is an object of the present invention to provide a conversion lens that can be used in combination with an interchangeable lens and an imaging device of different formats and has an anti-vibration function, and an imaging device having the same.

  In the conversion lens of the present invention, an imaging optical system that can be used as an interchangeable lens in a first imaging device having a plurality of first imaging elements can be applied to a second imaging device having a second imaging element. The conversion lens disposed between the imaging optical system and the second imaging element has a negative lens closest to the object side and at least two positive lenses closer to the image side than the negative lens, and part of the conversion lens Alternatively, the whole is moved in a direction perpendicular to the optical axis, thereby performing vibration isolation.

  ADVANTAGE OF THE INVENTION According to this invention, the interchangeable lens and imaging device of a different format can be used in combination, and the conversion lens which has an anti-vibration function, and an imaging device having the same can be obtained.

Lens sectional view when focusing on an object at infinity according to Numerical Example 1 (A), Lens sectional view of only conversion lens (B) Aberration diagram when focusing on an object at infinity in Numerical Example 1 (A), Aberration diagram at the time of image stabilization of 10% (1.36 mm) of the angle of view (B) Lens sectional view (A) when focusing on an object at infinity according to Numerical Example 2, Lens sectional view of only conversion lens (B) Aberration diagram when focusing on an object at infinity in Numerical Example 2 (A), Aberration diagram at the time of image stabilization of 10% (1.60 mm) of the angle of view (B) Lens cross-sectional view (A) when focusing on an object at infinity in Numerical Example 3, Lens cross-sectional view of only conversion lens (B) Aberration diagram when focusing on an object at infinity in Numerical Example 3 (A), Aberration diagram at the time of image stabilization of 10% (2.40 mm) of the angle of view (B) Lens cross-sectional view (A) when focusing on an object at infinity of Numerical Example 4 and lens cross-sectional view of only conversion lens (B) Aberration diagram when focusing on an object at infinity according to Numerical Example 4 (A), Aberration diagram at the time of image stabilization of 10% (2.80 mm) of the angle of view (B) Lens sectional view (A) when focusing on an object at infinity according to Numerical Example 5, Lens sectional view of only conversion lens (B) Aberration diagram when focusing on an object at infinity in Numerical Example 5 (A), Aberration diagram at the time of image stabilization of 10% (3.11 mm) of the angle of view (B) Schematic diagram of main parts of an imaging apparatus of the present invention

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  In the conversion lens of the present invention, an imaging optical system that can be used as an interchangeable lens in an imaging apparatus having a plurality of first imaging elements can be applied to an imaging apparatus having a second imaging element. In that case, the conversion lens of the present invention is disposed between the imaging optical system and the second imaging element. In addition, a negative lens and at least two positive lenses are provided in order from the object side to the image side. Further, it is possible to perform image stabilization by moving a part or the whole of the conversion lens in a direction perpendicular to the optical axis.

  FIG. 1A is a lens cross-sectional view when a main lens optical system for photographing is attached to the conversion lens of Embodiment 1 (Numerical Embodiment 1) of the present invention and focused at infinity. The main lens optical system is a zoom lens composed of a plurality of lens groups, and zooms by changing the interval between the predetermined lens groups. (B) is a sectional view of only the conversion lens.

  FIGS. 2A and 2B are aberration diagrams of Example 1 (Numerical Example 1) when (A) non-vibration-proofing and (B) anti-vibration (10% correction of angle of view). However, the aberration diagram shows the state when focusing on infinity. The focal length is a value when the value of the numerical example is expressed in mm. This is the same in all the following embodiments.

3, 5, 7, and 9 are sectional views of Examples 2 to 5 (Numerical Examples 2 to 5), respectively.
4, 6, 8, and 10 are (A) non-vibration-proof and (B) anti-vibration (when 10% of field angle is corrected) in Examples 2 to 5 (Numerical Examples 2 to 5), respectively. FIG.
FIG. 11 is a schematic diagram of a main part of the imaging apparatus of the present invention.

In each lens cross-sectional view, the left side is the subject (object) side (front) and the imaging optical system side, and the right side is the image side (rear). In the lens cross-sectional view, ML is a main lens optical system for photographing, and CL is a conversion lens disposed between the main lens optical system and the imaging surface. UL is a lens group that moves in a direction orthogonal to the optical axis (moves with a component orthogonal to the optical axis) during image stabilization.
Reference numeral I denotes an imaging surface, which corresponds to an imaging surface such as a solid-state imaging device (photoelectric conversion device) that receives an image formed by an optical system and performs photoelectric conversion.

  In the aberration diagrams, the straight line is the e-line, the two-dot chain line is the g-line, the one-dot chain line is the C-line, and the long dotted line is the F-line meridional ray. Dotted lines with short intervals are e-line sagittal rays. ω is a half angle of view, and Fno is an F number. Note that the lens group is moved upward with respect to the center angle of view of 0 degrees during image stabilization.

  In each embodiment, a main lens optical system used as an interchangeable lens for an image pickup apparatus having at least three color separation optical systems and first image pickup elements is used, and one second image pickup element without a color separation optical system is used. It can be applied to an image pickup apparatus. For this purpose, a conversion lens is disposed between the main lens optical system and the second image sensor. The conversion lens has a negative lens closest to the object side and at least two positive lenses closer to the image side than the negative lens. Furthermore, it is possible to perform image stabilization by moving a part or the whole of the conversion lens in a direction perpendicular to the optical axis.

  Since the main lens optical system is an optical system used for an image pickup apparatus having a color separation optical system, various aberrations, particularly spherical aberration and axial chromatic aberration, are used in a conversion lens to be applied to an optical system without a color separation optical system. Correction is performed.

  Further, since the negative lens is located closest to the object side, it becomes easy to correct off-axis aberrations while extending the back focus. In the two positive lenses, the positive lens on the object side effectively corrects chromatic aberration together with the negative lens, and the positive lens on the image side mainly has an imaging function.

  On the other hand, vibration can be prevented by moving a part or the whole of the conversion lens in a direction orthogonal to the optical axis. For this purpose, it is necessary that the lens group to be moved is roughly corrected for aberrations. However, in reality, aberrations occur in the main lens optical system due to minute changes in the optical path in the main lens optical system during image stabilization, so that minute aberrations remain to be canceled.

  By satisfying each of the above conditions, each embodiment of the present invention can be used in combination with an interchangeable lens and an imaging device of different formats, and obtains a conversion lens having an anti-vibration function.

The length in the air from the vertex of the lens closest to the object side of the conversion lens to the image forming point when the focused main lens optical system is mounted is L, the F number of the main lens optical system is Fm, and the main lens optics When the back focus in the air of the system is BFm, and the imaging magnification of the conversion lens when the focused main lens optical system is attached is β, the conversion lens of the present invention is
0.5 <(L · Fm) / (BFm · β) <2.0 (1)
1.1 <β <4.0 (2)
It is good to satisfy the condition.

  Conditional expression (1) standardizes and defines the length of the conversion lens to the image formation point by each parameter. The ratio between the F number of the main lens optical system and the back focus is substantially equal to the lens diameter on the most image side when the F number of the main lens optical system is small and the imaging device is small. When the main lens optical system and the conversion lens are arranged close to each other, the lens diameter closest to the image side of the main lens optical system is close to the lens diameter closest to the object side of the conversion lens. On the other hand, the imaging magnification and the length of the conversion lens are in a substantially proportional relationship. Therefore, the length of the conversion lens is normalized by the lens diameter and the imaging magnification. If the upper limit of conditional expression (1) is exceeded, the length of the conversion lens becomes long and the size thereof increases. If the lower limit of conditional expression (1) is exceeded, the length of the conversion lens becomes too short, and it becomes difficult to place a substrate or sensor for processing during vibration isolation.

  Conditional expression (2) defines the imaging magnification of the conversion lens. When the upper limit of conditional expression (2) is exceeded, the number of lenses of the conversion lens increases remarkably, and the overall size of the apparatus including the optical system becomes too large. When the lower limit of conditional expression (2) is exceeded, if the size of the image sensor after conversion is equal to or greater than the size before conversion, ray vignetting is likely to occur at the surrounding image height during image stabilization, and the image stabilization is almost impossible. The effect is not obtained.

More preferably in each embodiment, when the back focus in the air when the main lens optical system is attached to the conversion lens is BFc,
0.6 <BFc · Fm / BFm <2.5 (3)
It is good to satisfy the condition.

  Conditional expression (3) standardizes and defines the back focus of the entire optical system by each parameter. Similar to conditional expression (1), the ratio of the F number of the main lens optical system to the back focus is close to the diameter of the conversion lens, so the back focus is defined by the lens diameter. If the upper limit of conditional expression (3) is exceeded, the back focus is too long, and the overall size of the apparatus including the optical system becomes too large. If the lower limit of conditional expression (3) is exceeded, the back focus is too short, so that it is not possible to secure an interval for arranging a filter or the like inside the imaging apparatus.

More preferably in each embodiment, when the diagonal length of the sensor size of the first image sensor is ISm, and the diagonal length of the sensor size of the second image sensor is ISc,
1.0 <ISc / ISm <3.5 (4)
It is good to satisfy the condition.

  Conditional expression (4) has the first imaging element of the imaging device to which the main lens optical system can be attached without any optical system, and the imaging device to which the main lens optical system can be attached via the conversion lens. The ratio of the diagonal length of the second image sensor is defined. If the upper limit of conditional expression (4) is exceeded, the second image sensor becomes relatively large, leading to an increase in the number of conversion lenses and an increase in size. If the lower limit of conditional expression (4) is exceeded, the second image sensor becomes too small, which is not suitable for increasing the number of pixels and the sensitivity of the sensor.

When the focal length of the negative lens closest to the object side is fn and the refractive index is ndn, the conversion lens of the present invention is
−2.0 <fn / L <−0.1 (5)
1.81 <ndn <3.00 (6)
It is good to satisfy the condition.

  Conditional expression (5) defines the ratio of the focal length of the negative lens closest to the object side and the length to the imaging point of the conversion lens. If the upper limit of conditional expression (5) is exceeded, the focal length of the negative lens becomes relatively short, making it difficult to correct aberrations. If the lower limit of conditional expression (5) is exceeded, the focal length of the negative lens will be relatively long, making it difficult to increase the back focus, and securing an interval for arranging the filters in the imaging device. Have difficulty.

  Conditional expression (6) defines the refractive index of the negative lens closest to the object side. If the upper limit of conditional expression (6) is exceeded, correction of the Betzval sum becomes difficult, and field curvature occurs. If the lower limit of conditional expression (6) is exceeded, the radius of curvature of the negative lens becomes too small, making it difficult to correct various aberrations, leading to an increase in the number of lenses.

When the refractive index of the most object side positive lens is ndp and the Abbe number is νdp, the conversion lens of the present invention is
1.75 <ndp <3.00 (7)
5 <νdp <30 (8)
It is good to satisfy the condition.

  Conditional expression (7) defines the refractive index of the most object side positive lens. If the upper limit of conditional expression (7) is exceeded, correction of the Betzval sum becomes difficult, and field curvature occurs. If the lower limit of conditional expression (7) is exceeded, the radius of curvature of the positive lens becomes too small, making it difficult to correct various aberrations, leading to an increase in the number of lenses.

  Conditional expression (8) defines the Abbe number of the positive lens closest to the object side. If the range of conditional expression (8) is not satisfied, it will be difficult to correct chromatic aberration and deviate from the aberration balance inherent in the main lens optical system. As a result, when the main lens optical system zooms or focuses, it becomes difficult to balance chromatic aberration over the entire zoom and focus.

When the average Abbe number of the negative lens on the object side from the most positive lens on the object side is νdna, the conversion lens of the present invention is
1 <νdna−νdp <20 (9)
It is good to satisfy the condition.

  Conditional expression (9) defines the ratio between the Abbe number of the positive lens closest to the object side and the Abbe number of the negative lens closer to the object side than the positive lens. Outside the range of conditional expression (9), it becomes difficult to correct axial chromatic aberration and lateral chromatic aberration at the same time, leading to an increase in the number of lenses.

  More preferably, it is preferable to have a conversion lens and a second imaging element inside the imaging device. According to this, it is possible to shorten the back focus of the conversion lens by optimally arranging the filters in the imaging apparatus, and it is possible to reduce not only the total length but also the number of conversion lenses.

More preferably, the numerical ranges of the conditional expressions (1) to (9) are set as follows.
0.90 <(L · Fm) / (BFm · β) <1.50 (1a)
1.30 <β <3.40 (2a)
0.80 <BFc · Fm / BFm <2.20 (3a)
1.10 <ISc / ISm <3.10 (4a)
−1.60 <fn / L <−0.25 (5a)
1.85 <ndn <2.50 (6a)
1.78 <ndp <2.30 (7a)
10.0 <νdp <25.0 (8a)
3.0 <νdna−νdp <17.0 (9a)

Next, features of the main lens optical system having a configuration common to the embodiments will be described.
The first lens surface to the nineteenth lens surface are fixed lens groups during zooming, and the seventh lens surface to the eleventh lens surface move along the optical axis during focusing. The two lens groups of the 20th lens surface to the 27th lens surface and the 28th lens surface to the 38th lens surface move along the optical axis during zooming. The 39th lens surface to the 55th lens surface are lens groups that are fixed during zooming, and the stop is the 39th lens surface. The 56th to 58th lens surfaces correspond to prisms and the like inside the camera.

  The main lens optical system is designed to be compatible with an imaging element having a diagonal length of 11 mm, and this 11 mm is referred to as an image circle in a range where there is no light vignetting.

  Next, the features of the lens configuration of each example will be described.

  In Example 1, the conversion lens is the 56th lens surface to the 61st lens surface. The anti-vibration lens group is the 56th lens surface to the 59th lens surface, and the 60th lens surface to the 61st lens surface is a fixed lens at the time of image stabilization. The 59th lens surface is aspherical, and corrects various aberrations during image stabilization, mainly coma and curvature of field.

  As shown in Table 1 to be described later, Numerical Example 1 satisfies all the conditional expressions (1) to (9), and the imaging magnification is 1.36 times. Anti-vibration of 10% of the diagonal length (1.36 mm) is achieved by moving the anti-vibration lens group by 1.00 mm in the direction perpendicular to the optical axis with respect to the imaging element having a diagonal length of 13.6 mm. . In addition, high optical performance with excellent correction of various aberrations is obtained, and high performance is maintained even during image stabilization.

  In Example 2, the conversion lens is the 56th lens surface to the 62nd lens surface. The anti-vibration lens group includes the 56th lens surface to the 62nd lens surface.

  As shown in Table 1 to be described later, Numerical Example 2 satisfies all the conditional expressions (1) to (9), and the imaging magnification is 1.60 times. Anti-vibration of 10% (1.60 mm) of the diagonal length is achieved by moving the anti-vibration lens group by 1.33 mm in the direction perpendicular to the optical axis with respect to the imaging element having a diagonal length of 16.0 mm. . In addition, high optical performance with excellent correction of various aberrations is obtained, and high performance is maintained even during image stabilization.

  In Example 3, the conversion lens has a 56th lens surface to a 65th lens surface. The anti-vibration lens group includes the 56th lens surface to the 60th lens surface, and the 61st lens surface to the 65th lens surface are fixed lenses during vibration isolation.

  As shown in Table 1 to be described later, Numerical Example 1 satisfies all the conditional expressions (1) to (9), and the imaging magnification is 2.40 times. Anti-vibration of 10% of the diagonal length (2.40 mm) is achieved by moving the anti-vibration lens group by 0.93 mm in the direction perpendicular to the optical axis with respect to the imaging element having a diagonal length of 24.0 mm. . In addition, high optical performance with excellent correction of various aberrations is obtained, and high performance is maintained even during image stabilization.

  In Example 4, the conversion lens is the 56th lens surface to the 66th lens surface. The anti-vibration lens group is a 56th lens surface to a 66th lens surface.

  As shown in Table 1 to be described later, Numerical Example 4 satisfies all the conditional expressions (1) to (9), and the imaging magnification is 2.80 times. Anti-vibration of 10% of the diagonal length (2.80 mm) is achieved by moving the anti-vibration lens group by 0.78 mm in the direction perpendicular to the optical axis with respect to the imaging element having a diagonal length of 28.0 mm. . In addition, high optical performance with excellent correction of various aberrations is obtained, and high performance is maintained even during image stabilization.

  In Example 5, the conversion lens is the 56th lens surface to the 69th lens surface. The anti-vibration lens group includes the 56th lens surface to the 63rd lens surface, and the 64th lens surface to the 69th lens surface are fixed lenses during vibration isolation. The 61st lens surface is aspherical and corrects various aberrations at the time of image stabilization, mainly coma and curvature of field.

  As shown in Table 1 described later, Numerical Example 5 satisfies all the conditional expressions (1) to (9), and the imaging magnification is 3.11 times. Anti-vibration of 10% of the diagonal length (3.11 mm) is achieved by moving the anti-vibration lens group by 0.84 mm in the direction perpendicular to the optical axis with respect to the imaging element having a diagonal length of 31.1 mm. . In addition, high optical performance with excellent correction of various aberrations is obtained, and high performance is maintained even during image stabilization.

  As described above, according to each embodiment, the refractive power arrangement and the aspherical arrangement of each lens group are appropriately defined. As a result, a conversion lens is obtained in which various aberrations are favorably corrected both at the time of image stabilization and at the time of non-image stabilization.

  FIG. 11 is a schematic diagram of a main part of an imaging apparatus (camera system) using the conversion lens and the main lens optical system of Examples 1 to 5 as a photographing optical system. In FIG. 11, reference numeral 102 denotes a conversion lens according to any one of Examples 1 to 5. 101 is a main lens optical system, and 124 is a camera. The conversion lens 102 can be attached to and detached from the camera 124, and the main lens optical system 101 can be attached to and detached from the conversion lens 102. An imaging apparatus 125 is configured by attaching the conversion lens 102 and the main lens optical system 101 to the camera 124. The conversion lens 102 includes an anti-vibration lens group UL and a lens group C that is fixed during anti-vibration. Reference numeral 131 denotes a drive mechanism such as a magnet or a motor that drives the vibration-proof lens group UL in a direction orthogonal to the optical axis. Reference numeral 130 denotes a detector such as a gyro for detecting lens shake.

The main lens optical system 101 includes a first lens group F, a zoom unit LZ, and a final lens group R for image formation.
The zoom unit LZ includes a lens group that moves on the optical axis for zooming. SP is an aperture stop. Reference numerals 114 and 115 denote driving mechanisms such as helicoids and cams for driving the first lens group F and the zooming portion LZ in the optical axis direction, respectively.

  Reference numerals 116 to 118 denote motors (drive means) that electrically drive the drive mechanisms 114 and 115 and the aperture stop SP. Reference numerals 119 to 121 denote detectors such as an encoder, a potentiometer, or a photosensor for detecting the positions of the first lens group F and the zooming unit LZ on the optical axis and the aperture diameter of the aperture stop SP. In the camera 124, 109 is a glass block corresponding to an optical filter in the camera 124, 110 is a solid-state imaging device (photoelectric sensor) such as a CCD sensor or a CMOS sensor that receives a subject image formed by the main lens optical system 101 and the conversion lens 102. Conversion element).

  Reference numerals 111, 122, and 132 denote CPUs that control various types of driving of the camera 124, the conversion lens 102, and the main lens optical system 101. Thus, by applying the conversion lens of the present invention to a camera, an imaging device having high optical performance is realized.

  In FIG. 11, the conversion lens is detachable. However, the same effect can be obtained even if the conversion lens is arranged inside the imaging apparatus.

  The preferred embodiments of the present invention have been described above, but the present invention is not limited to these embodiments, and various modifications and changes can be made within the scope of the gist.

Numerical examples 1 to 5 for the main lens optical system and Examples 1 to 5 of each example of the present invention are shown below.
In each numerical example, i indicates the order of the surfaces from the object side, ri is the radius of curvature of the i-th surface from the object side, di is the i-th and i + 1-th distance from the object side, ndi, νdi Are the refractive index and Abbe number of the i-th optical member.
Aspherical surfaces are marked with * next to the surface number. Table 1 shows the correspondence between the respective examples and the conditional expressions described above.

The aspheric shape is the X axis in the optical axis direction, the H axis in the direction perpendicular to the optical axis, the light traveling direction is positive, R is the paraxial radius of curvature, k is the cone constant, and A4, A6, and A8 are the aspheric coefficients. Is expressed by the following equation. “E-Z” means “× 10 ^−Z ”.

Main lens unit mm

Surface data surface number rd nd vd Effective diameter
1 * 17634.271 4.70 1.69680 55.5 183.19
2 109.899 46.92 152.38
3 -201.325 4.50 1.69680 55.5 151.93
4 1829.577 0.15 155.00
5 283.523 12.64 1.80518 25.4 158.03
6 2167.464 5.15 157.76
7 -2805.896 18.49 1.48749 70.2 157.47
8 -196.467 0.20 157.29
9 -1000.469 4.40 1.80518 25.4 149.49
10 603.998 16.55 1.48749 70.2 146.78
11 -307.782 32.56 146.03
12 315.156 17.48 1.48749 70.2 155.94
13 -596.320 0.15 156.09
14 191.137 4.40 1.80518 25.4 155.18
15 118.065 0.39 149.21
16 119.291 35.44 1.48749 70.2 149.24
17 -534.941 0.15 148.58
18 * 200.940 12.13 1.62041 60.3 141.59
19 826.607 (variable) 140.30
20 129.425 1.50 1.88300 40.8 52.29
21 64.705 6.90 48.69
22 -200.592 1.50 1.72916 54.7 47.84
23 41.776 10.46 1.84666 23.8 43.43
24 -106.134 1.50 1.72916 54.7 42.53
25 86.715 6.25 41.00
26 -81.264 1.50 1.88300 40.8 40.91
27 227.627 (variable) 41.93
28 600.754 6.75 1.62041 60.3 51.99
29 -114.148 0.15 52.85
30 117.668 11.71 1.48749 70.2 53.85
31 -75.558 0.09 53.66
32 -76.874 1.60 1.80518 25.4 53.57
33 -134.820 0.15 53.89
34 86.226 1.60 1.80518 25.4 52.65
35 48.805 10.30 1.48749 70.2 50.88
36 2324.271 0.15 50.18
37 94.553 6.65 1.62041 60.3 49.18
38 -6865.358 (variable) 47.86
39 (Aperture) ∞ 3.42 29.98
40 -46.195 1.50 1.77250 49.6 29.29
41 36.572 7.11 1.78472 25.7 28.98
42 -43.549 1.50 1.77250 49.6 28.89
43 69.864 5.93 28.57
44 -41.024 19.74 1.77250 49.6 28.98
45 -41.228 8.40 37.08
46 -195.562 4.78 1.62041 60.3 37.58
47 -59.391 0.20 37.84
48 277.984 1.80 1.88300 40.8 36.81
49 37.998 7.73 1.48749 70.2 35.68
50 -82.491 0.20 35.71
51 81.354 8.17 1.48749 70.2 34.96
52 -31.106 1.80 1.83400 37.2 34.70
53 -201.103 0.20 35.02
54 180.091 6.65 1.48749 70.2 34.93
55 -40.373 5.00 34.74
56 ∞ 33.00 1.60859 46.4 40.00
57 ∞ 13.20 1.51633 64.2 40.00
58 ∞ 12.00 40.00
Image plane ∞

Aspheric data 1st surface
K = 1.68492e + 004 A 4 = 2.64785e-008 A 6 = -1.47610e-012 A 8 = 8.96960e-017 A10 = -3.30657e-021

18th page
K = -1.44619e-001 A 4 = -7.46282e-009 A 6 = -2.04300e-013 A 8 = 1.70939e-017 A10 = -3.75331e-021

Various data

Focal length 6.70
F number 1.50
Half angle of view 39.38
Statue height 5.50
Total lens length 606.22
BF 12.00

d19 3.93
d27 173.49
d38 1.30

Entrance pupil position 107.96
Exit pupil position 328.64
Front principal point position 114.80
Rear principal point position 5.30

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 120.59 216.39 131.11 72.76
2 20 -30.00 29.61 13.82 -6.54
3 28 50.00 39.16 11.50 -15.21
4 39 40.05 130.33 45.82 10.33

Single lens Data lens Start surface Focal length
1 1 -158.05
2 3 -258.94
3 5 400.19
4 7 430.89
5 9 -462.89
6 10 419.32
7 12 424.19
8 14 -390.58
9 16 203.02
10 18 423.07
11 20 -147.30
12 22 -47.09
13 23 36.24
14 24 -64.95
15 26 -67.27
16 28 154.56
17 30 95.98
18 32 -222.86
19 34 -141.09
20 35 101.76
21 37 149.80
22 40 -26.09
23 41 26.13
24 42 -34.36
25 44 258.69
26 46 135.12
27 48 -49.73
28 49 54.33
29 51 47.13
30 52 -44.05
31 54 68.10
32 56 0.00
33 57 0.00

Numerical example 1
Unit mm

Surface data surface number rd nd vd Effective diameter
1 * 17634.271 4.70 1.69680 55.5 183.19
2 109.899 46.92 152.38
3 -201.325 4.50 1.69680 55.5 151.93
4 1829.577 0.15 155.00
5 283.523 12.64 1.80518 25.4 158.03
6 2167.464 5.15 157.76
7 -2805.896 18.49 1.48749 70.2 157.47
8 -196.467 0.20 157.29
9 -1000.469 4.40 1.80518 25.4 149.49
10 603.998 16.55 1.48749 70.2 146.78
11 -307.782 32.56 146.03
12 315.156 17.48 1.48749 70.2 155.94
13 -596.320 0.15 156.09
14 191.137 4.40 1.80518 25.4 155.18
15 118.065 0.39 149.21
16 119.291 35.44 1.48749 70.2 149.24
17 -534.941 0.15 148.58
18 * 200.940 12.13 1.62041 60.3 141.59
19 826.607 3.93 140.30
20 129.425 1.50 1.88300 40.8 52.29
21 64.705 6.90 48.69
22 -200.592 1.50 1.72916 54.7 47.84
23 41.776 10.46 1.84666 23.8 43.43
24 -106.134 1.50 1.72916 54.7 42.53
25 86.715 6.25 41.00
26 -81.264 1.50 1.88300 40.8 40.91
27 227.627 173.49 41.93
28 600.754 6.75 1.62041 60.3 51.99
29 -114.148 0.15 52.85
30 117.668 11.71 1.48749 70.2 53.85
31 -75.558 0.09 53.66
32 -76.874 1.60 1.80518 25.4 53.57
33 -134.820 0.15 53.89
34 86.226 1.60 1.80518 25.4 52.65
35 48.805 10.30 1.48749 70.2 50.88
36 2324.271 0.15 50.18
37 94.553 6.65 1.62041 60.3 49.18
38 -6865.358 1.30 47.86
39 (Aperture) ∞ 3.42 29.98
40 -46.195 1.50 1.77250 49.6 29.29
41 36.572 7.11 1.78472 25.7 28.98
42 -43.549 1.50 1.77250 49.6 28.89
43 69.864 5.93 28.57
44 -41.024 19.74 1.77250 49.6 28.98
45 -41.228 8.40 37.08
46 -195.562 4.78 1.62041 60.3 37.58
47 -59.391 0.20 37.84
48 277.984 1.80 1.88300 40.8 36.81
49 37.998 7.73 1.48749 70.2 35.68
50 -82.491 0.20 35.71
51 81.354 8.17 1.48749 70.2 34.96
52 -31.106 1.80 1.83400 37.2 34.70
53 -201.103 0.20 35.02
54 180.091 6.65 1.48749 70.2 34.93
55 -40.373 12.00 34.74
56 -339.273 1.50 2.00330 28.3 26.94
57 42.375 6.63 26.26
58 93.825 3.29 1.95906 17.5 28.01
59 * -514.249 1.40 28.02
60 42.327 3.46 1.49700 81.5 27.74
61 109.453 40.00 27.21
Image plane ∞

Aspheric data 59th surface
K = 0.00000e + 000 A 4 = -1.13711e-006 A 6 = -1.57811e-009 A 8 = 3.13303e-012

Various data

Focal length 9.11
F number 2.04
Half angle of view 36.73
Image height 6.80
Total lens length 611.30
BF 40.00
d55 12.00

Entrance pupil position 107.96
Exit pupil position -1066.36
Front principal point position 116.99
Rear principal point position 30.89

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 6.70 543.02 114.80 39.47
2 56 -281.58 16.28 -40.37 -61.37

Single lens Data lens Start surface Focal length
32 56 -37.16
33 58 81.86
34 60 136.13

Numerical example 2
Unit mm

Surface data surface number rd nd vd Effective diameter
1 * 17634.271 4.70 1.69680 55.5 183.19
2 109.899 46.92 152.38
3 -201.325 4.50 1.69680 55.5 151.93
4 1829.577 0.15 155.00
5 283.523 12.64 1.80518 25.4 158.03
6 2167.464 5.15 157.76
7 -2805.896 18.49 1.48749 70.2 157.47
8 -196.467 0.20 157.29
9 -1000.469 4.40 1.80518 25.4 149.49
10 603.998 16.55 1.48749 70.2 146.78
11 -307.782 32.56 146.03
12 315.156 17.48 1.48749 70.2 155.94
13 -596.320 0.15 156.09
14 191.137 4.40 1.80518 25.4 155.18
15 118.065 0.39 149.21
16 119.291 35.44 1.48749 70.2 149.24
17 -534.941 0.15 148.58
18 * 200.940 12.13 1.62041 60.3 141.59
19 826.607 3.93 140.30
20 129.425 1.50 1.88300 40.8 52.29
21 64.705 6.90 48.69
22 -200.592 1.50 1.72916 54.7 47.84
23 41.776 10.46 1.84666 23.8 43.43
24 -106.134 1.50 1.72916 54.7 42.53
25 86.715 6.25 41.00
26 -81.264 1.50 1.88300 40.8 40.91
27 227.627 173.49 41.93
28 600.754 6.75 1.62041 60.3 51.99
29 -114.148 0.15 52.85
30 117.668 11.71 1.48749 70.2 53.85
31 -75.558 0.09 53.66
32 -76.874 1.60 1.80518 25.4 53.57
33 -134.820 0.15 53.89
34 86.226 1.60 1.80518 25.4 52.65
35 48.805 10.30 1.48749 70.2 50.88
36 2324.271 0.15 50.18
37 94.553 6.65 1.62041 60.3 49.18
38 -6865.358 1.30 47.86
39 (Aperture) ∞ 3.42 29.98
40 -46.195 1.50 1.77250 49.6 29.29
41 36.572 7.11 1.78472 25.7 28.98
42 -43.549 1.50 1.77250 49.6 28.89
43 69.864 5.93 28.57
44 -41.024 19.74 1.77250 49.6 28.98
45 -41.228 8.40 37.08
46 -195.562 4.78 1.62041 60.3 37.58
47 -59.391 0.20 37.84
48 277.984 1.80 1.88300 40.8 36.81
49 37.998 7.73 1.48749 70.2 35.68
50 -82.491 0.20 35.71
51 81.354 8.17 1.48749 70.2 34.96
52 -31.106 1.80 1.83400 37.2 34.70
53 -201.103 0.20 35.02
54 180.091 6.65 1.48749 70.2 34.93
55 -40.373 12.00 34.74
56 163.150 1.50 1.88300 40.8 29.18
57 48.064 20.00 28.04
58 -137.392 1.50 1.95375 32.3 24.59
59 24.134 5.39 1.80809 22.8 24.52
60 24339.091 0.36 24.69
61 33.413 4.25 1.58913 61.1 25.11
62 389.925 30.00 24.70
Image plane ∞

Various data

Focal length 10.72
F number 2.40
Half angle of view 36.73
Statue height 8.00
Total lens length 618.02
BF 30.00

d55 12.00

Entrance pupil position 107.96
Exit pupil position -273.83
Front principal point position 118.30
Rear principal point 19.28

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 6.70 543.02 114.80 39.47
2 56 -138.12 33.00 -17.63 -52.87

Single lens Data lens Start surface Focal length
32 56 -77.19
33 58 -21.27
34 59 29.59
35 61 61.52

Numerical Example 3
Unit mm

Surface data surface number rd nd vd Effective diameter
1 * 17634.271 4.70 1.69680 55.5 183.19
2 109.899 46.92 152.38
3 -201.325 4.50 1.69680 55.5 151.93
4 1829.577 0.15 155.00
5 283.523 12.64 1.80518 25.4 158.03
6 2167.464 5.15 157.76
7 -2805.896 18.49 1.48749 70.2 157.47
8 -196.467 0.20 157.29
9 -1000.469 4.40 1.80518 25.4 149.49
10 603.998 16.55 1.48749 70.2 146.78
11 -307.782 32.56 146.03
12 315.156 17.48 1.48749 70.2 155.94
13 -596.320 0.15 156.09
14 191.137 4.40 1.80518 25.4 155.18
15 118.065 0.39 149.21
16 119.291 35.44 1.48749 70.2 149.24
17 -534.941 0.15 148.58
18 * 200.940 12.13 1.62041 60.3 141.59
19 826.607 3.93 140.30
20 129.425 1.50 1.88300 40.8 52.29
21 64.705 6.90 48.69
22 -200.592 1.50 1.72916 54.7 47.84
23 41.776 10.46 1.84666 23.8 43.43
24 -106.134 1.50 1.72916 54.7 42.53
25 86.715 6.25 41.00
26 -81.264 1.50 1.88300 40.8 40.91
27 227.627 173.49 41.93
28 600.754 6.75 1.62041 60.3 51.99
29 -114.148 0.15 52.85
30 117.668 11.71 1.48749 70.2 53.85
31 -75.558 0.09 53.66
32 -76.874 1.60 1.80518 25.4 53.57
33 -134.820 0.15 53.89
34 86.226 1.60 1.80518 25.4 52.65
35 48.805 10.30 1.48749 70.2 50.88
36 2324.271 0.15 50.18
37 94.553 6.65 1.62041 60.3 49.18
38 -6865.358 1.30 47.86
39 (Aperture) ∞ 3.42 29.98
40 -46.195 1.50 1.77250 49.6 29.29
41 36.572 7.11 1.78472 25.7 28.98
42 -43.549 1.50 1.77250 49.6 28.89
43 69.864 5.93 28.57
44 -41.024 19.74 1.77250 49.6 28.98
45 -41.228 8.40 37.08
46 -195.562 4.78 1.62041 60.3 37.58
47 -59.391 0.20 37.84
48 277.984 1.80 1.88300 40.8 36.81
49 37.998 7.73 1.48749 70.2 35.68
50 -82.491 0.20 35.71
51 81.354 8.17 1.48749 70.2 34.96
52 -31.106 1.80 1.83400 37.2 34.70
53 -201.103 0.20 35.02
54 180.091 6.65 1.48749 70.2 34.93
55 -40.373 12.00 34.74
56 104.749 1.50 1.95375 32.3 29.13
57 27.380 8.39 27.32
58 29.715 7.17 1.80809 22.8 29.27
59 -82.121 1.50 2.00100 29.1 28.49
60 55.041 18.11 27.15
61 -67.167 3.87 1.48749 70.2 25.67
62 -28.199 0.20 25.80
63 -49.051 5.53 1.85478 24.8 25.04
64 -17.807 1.50 2.00100 29.1 25.08
65 -73.153 40.00 25.94
Image plane ∞

Various data

Focal length 16.08
F number 3.60
Half angle of view 36.73
Statue height 12.00
Total lens length 642.78
BF 40.00

d55 12.00

Entrance pupil position 107.96
Exit pupil position -100.58
Front principal point position 122.20
Rear principal point position 23.92

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 6.70 543.02 114.80 39.47
2 56 -54.38 47.77 2.44 -36.14

Single lens Data lens Start surface Focal length
32 56 -38.96
33 58 27.52
34 59 -32.48
35 61 96.23
36 63 29.94
37 64 -23.64

Numerical Example 4
Unit mm

Surface data surface number rd nd vd Effective diameter
1 * 17634.271 4.70 1.69680 55.5 183.19
2 109.899 46.92 152.38
3 -201.325 4.50 1.69680 55.5 151.93
4 1829.577 0.15 155.00
5 283.523 12.64 1.80518 25.4 158.03
6 2167.464 5.15 157.76
7 -2805.896 18.49 1.48749 70.2 157.47
8 -196.467 0.20 157.29
9 -1000.469 4.40 1.80518 25.4 149.49
10 603.998 16.55 1.48749 70.2 146.78
11 -307.782 32.56 146.03
12 315.156 17.48 1.48749 70.2 155.94
13 -596.320 0.15 156.09
14 191.137 4.40 1.80518 25.4 155.18
15 118.065 0.39 149.21
16 119.291 35.44 1.48749 70.2 149.24
17 -534.941 0.15 148.58
18 * 200.940 12.13 1.62041 60.3 141.59
19 826.607 3.93 140.30
20 129.425 1.50 1.88300 40.8 52.29
21 64.705 6.90 48.69
22 -200.592 1.50 1.72916 54.7 47.84
23 41.776 10.46 1.84666 23.8 43.43
24 -106.134 1.50 1.72916 54.7 42.53
25 86.715 6.25 41.00
26 -81.264 1.50 1.88300 40.8 40.91
27 227.627 173.49 41.93
28 600.754 6.75 1.62041 60.3 51.99
29 -114.148 0.15 52.85
30 117.668 11.71 1.48749 70.2 53.85
31 -75.558 0.09 53.66
32 -76.874 1.60 1.80518 25.4 53.57
33 -134.820 0.15 53.89
34 86.226 1.60 1.80518 25.4 52.65
35 48.805 10.30 1.48749 70.2 50.88
36 2324.271 0.15 50.18
37 94.553 6.65 1.62041 60.3 49.18
38 -6865.358 1.30 47.86
39 (Aperture) ∞ 3.42 29.98
40 -46.195 1.50 1.77250 49.6 29.29
41 36.572 7.11 1.78472 25.7 28.98
42 -43.549 1.50 1.77250 49.6 28.89
43 69.864 5.93 28.57
44 -41.024 19.74 1.77250 49.6 28.98
45 -41.228 8.40 37.08
46 -195.562 4.78 1.62041 60.3 37.58
47 -59.391 0.20 37.84
48 277.984 1.80 1.88300 40.8 36.81
49 37.998 7.73 1.48749 70.2 35.68
50 -82.491 0.20 35.71
51 81.354 8.17 1.48749 70.2 34.96
52 -31.106 1.80 1.83400 37.2 34.70
53 -201.103 0.20 35.02
54 180.091 6.65 1.48749 70.2 34.93
55 -40.373 19.49 34.74
56 515.790 1.50 2.00069 25.5 25.30
57 29.839 7.87 24.08
58 38.858 1.50 2.00069 25.5 25.99
59 15.882 8.12 1.92286 18.9 24.78
60 230.891 6.51 24.41
61 -139.612 1.50 2.00100 29.1 23.29
62 39.951 7.23 1.59551 39.2 23.25
63 -25.132 0.20 23.61
64 -37.628 1.50 2.00100 29.1 23.02
65 52.202 4.08 1.85478 24.8 23.56
66 -103.569 40.00 23.89
Image plane ∞

Various data

Focal length 18.76
F number 4.19
Half angle of view 36.73
Statue height 14.00
Total lens length 642.51
BF 40.00

d55 19.49

Entrance pupil position 107.96
Exit pupil position -59.57
Front principal point position 123.18
Rear principal point position 21.24

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 6.70 543.02 114.80 39.47
2 56 -34.19 40.00 4.70 -21.54

Single lens Data lens Start surface Focal length
31 54 68.10
32 56 -31.41
33 58 -27.50
34 59 17.93
35 61 -30.65
36 62 26.87
37 64 -21.49
38 65 40.72

Numerical Example 5
Unit mm

Surface data surface number rd nd vd Effective diameter
1 * 17634.271 4.70 1.69680 55.5 183.19
2 109.899 46.92 152.38
3 -201.325 4.50 1.69680 55.5 151.93
4 1829.577 0.15 155.00
5 283.523 12.64 1.80518 25.4 158.03
6 2167.464 5.15 157.76
7 -2805.896 18.49 1.48749 70.2 157.47
8 -196.467 0.20 157.29
9 -1000.469 4.40 1.80518 25.4 149.49
10 603.998 16.55 1.48749 70.2 146.78
11 -307.782 32.56 146.03
12 315.156 17.48 1.48749 70.2 155.94
13 -596.320 0.15 156.09
14 191.137 4.40 1.80518 25.4 155.18
15 118.065 0.39 149.21
16 119.291 35.44 1.48749 70.2 149.24
17 -534.941 0.15 148.58
18 * 200.940 12.13 1.62041 60.3 141.59
19 826.607 3.93 140.30
20 129.425 1.50 1.88300 40.8 52.29
21 64.705 6.90 48.69
22 -200.592 1.50 1.72916 54.7 47.84
23 41.776 10.46 1.84666 23.8 43.43
24 -106.134 1.50 1.72916 54.7 42.53
25 86.715 6.25 41.00
26 -81.264 1.50 1.88300 40.8 40.91
27 227.627 173.49 41.93
28 600.754 6.75 1.62041 60.3 51.99
29 -114.148 0.15 52.85
30 117.668 11.71 1.48749 70.2 53.85
31 -75.558 0.09 53.66
32 -76.874 1.60 1.80518 25.4 53.57
33 -134.820 0.15 53.89
34 86.226 1.60 1.80518 25.4 52.65
35 48.805 10.30 1.48749 70.2 50.88
36 2324.271 0.15 50.18
37 94.553 6.65 1.62041 60.3 49.18
38 -6865.358 1.30 47.86
39 (Aperture) ∞ 3.42 29.98
40 -46.195 1.50 1.77250 49.6 29.29
41 36.572 7.11 1.78472 25.7 28.98
42 -43.549 1.50 1.77250 49.6 28.89
43 69.864 5.93 28.57
44 -41.024 19.74 1.77250 49.6 28.98
45 -41.228 8.40 37.08
46 -195.562 4.78 1.62041 60.3 37.58
47 -59.391 0.20 37.84
48 277.984 1.80 1.88300 40.8 36.81
49 37.998 7.73 1.48749 70.2 35.68
50 -82.491 0.20 35.71
51 81.354 8.17 1.48749 70.2 34.96
52 -31.106 1.80 1.83400 37.2 34.70
53 -201.103 0.20 35.02
54 180.091 6.65 1.48749 70.2 34.93
55 -40.373 14.64 34.74
56 125.704 1.50 2.00100 29.1 27.72
57 23.883 1.43 25.89
58 32.377 1.50 2.00100 29.1 26.07
59 15.286 9.56 1.80809 22.8 25.00
60 1089.814 8.02 25.20
61 * -90.267 1.50 1.95375 32.3 26.17
62 162.199 4.54 1.51742 52.4 26.35
63 -45.616 5.00 26.64
64 -31.372 1.50 2.00100 29.1 26.21
65 -197.684 6.53 1.68893 31.1 27.77
66 -25.168 0.20 28.88
67 -104.448 7.58 1.85478 24.8 28.22
68 -19.585 1.50 2.00100 29.1 28.30
69 -91.982 60.00 29.42
Image plane ∞

Aspheric data

61st
K = 0.00000e + 000 A 4 = 9.72422e-006 A 6 = 9.05906e-009 A 8 = 6.38844e-011

Various data

Focal length 20.84
F number 4.66
Half angle of view 36.73
Statue height 15.55
Total lens length 668.02
BF 60.00

d55 14.64

Entrance pupil position 107.96
Exit pupil position -98.56
Front principal point position 126.06
Rear principal point position 39.16

Zoom lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 6.70 543.02 114.80 39.47
2 56 -48.47 50.36 -1.36 -42.28

Single lens Data lens Start surface Focal length
32 56 -29.44
33 58 -30.02
34 59 18.91
35 61 -60.19
36 62 69.01
37 64 -37.12
38 65 40.91
39 67 26.82
40 68 -24.92

ML main lens optical system, CL conversion lens, UL anti-vibration lens group, I image plane

Claims (8)

  An imaging optical system that can be used as an interchangeable lens in a first imaging device having a plurality of first imaging elements, and applicable to a second imaging device having a second imaging element; and A conversion lens disposed between the second imaging element and having a negative lens closest to the object side and at least two positive lenses closer to the image side than the negative lens, and a part or the whole of the conversion lens A conversion lens characterized by performing vibration isolation by moving the lens in a direction perpendicular to the optical axis. The length in the air from the lens apex of the conversion lens closest to the object side to the image forming point when the imaging optical system in the focused state is attached is L, the F number of the imaging optical system is Fm, and the imaging When the back focus in the air of the optical system is BFm, and the imaging magnification of the conversion lens when the imaging optical system in the focused state is attached is β,
0.5 <(L · Fm) / (BFm · β) <2.0
1.1 <β <4.0
The conversion lens according to claim 1, wherein the following condition is satisfied. When the back focus in the air when the imaging optical system is attached to the conversion lens is BFc,
0.6 <BFc · Fm / BFm <2.5
The conversion lens according to claim 1, wherein the following condition is satisfied. When the diagonal length of the sensor size of the first image sensor is ISm and the diagonal length of the sensor size of the second image sensor is ISc,
1.0 <ISc / ISm <3.5
The conversion lens according to claim 1, wherein the following condition is satisfied. When the focal length of the negative lens closest to the object side is fn and the refractive index is ndn,
−2.0 <fn / L <−0.1
1.81 <ndn <3.00
The conversion lens according to claim 1, wherein the following condition is satisfied. When the refractive index of the positive lens closest to the object side is ndp and the Abbe number is νdp,
1.75 <ndp <3.00
5 <νdp <30
The conversion lens according to claim 1, wherein the following condition is satisfied. When the average Abbe number of the object side negative lens from the most object side positive lens is νdna,
1 <νdna−νdp <20
The conversion lens according to claim 1, wherein the following condition is satisfied.   An image pickup apparatus comprising the conversion lens according to claim 1 and an image pickup device.

Images