JP6664362B2 - Optical system and imaging apparatus having the same - Google Patents

Description

  The present invention relates to an optical system and an image pickup apparatus having the same, for example, an image pickup apparatus using an image pickup device such as a digital still camera, a video camera, a surveillance camera, a broadcast camera, or an image pickup apparatus such as a camera using a silver halide photographic film. It is suitable for.

  As a photographing optical system having a long focal length, a so-called telephoto type photographing optical system in which an optical system having a positive refractive power is arranged on the object side and an optical system having a negative refractive power is arranged on the image side is known. . 2. Description of the Related Art Telephoto type photographing optical systems are used, for example, in single-focus super telephoto lenses.

  In a super telephoto lens, generally, axial chromatic aberration and lateral chromatic aberration increase as the focal length increases. As a technique for satisfactorily correcting these chromatic aberrations, it is known to use a material having low dispersion and high anomalous dispersion for the material of the positive lens disposed closest to the object side.

  In the optical system of Patent Document 1, a positive lens L11 and a positive lens L12 made of a material having low dispersion and high anomalous dispersion are arranged continuously from the object side. Here, a material used as a material of the positive lens and having low dispersion and high anomalous dispersion generally has low scratch resistance. Therefore, the optical system of Patent Document 1 has a configuration in which a cover glass is arranged on the object side of the positive lens L11 so that an external impact or the like is hardly applied to the positive lens L11.

JP 2015-215559 A

  In the optical system of Patent Document 1, good correction of chromatic aberration is achieved by disposing the positive lens L11 and the positive lens L12 at a position where the incident height of the on-axis ray and the off-axis ray becomes high. The effective diameter of the positive lens L12 tends to be large, and the weight of the optical system tends to increase.

  In order to further reduce the weight of the optical system, it is important to arrange a positive lens formed of a material having low dispersion and high anomalous dispersion at an appropriate position.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an optical system which is lightweight and has aberrations such as chromatic aberration corrected well, and an imaging apparatus having the same.

The optical system according to the present invention includes a first lens unit , a second lens unit , and a third lens unit having a positive refractive power, which are arranged in order from the object side to the image side, and the second lens unit moves during focusing. An optical system in which the distance between adjacent lens groups changes, wherein the first lens group includes a positive lens G1p disposed closest to the object and a positive lens disposed closer to the image than the positive lens G1p. G2p, a positive lens G3p disposed closer to the image side than the positive lens G2p, and at least one negative lens, wherein the focal length of the optical system is f, and the lens closest to the object in the first lens group. LD is the distance on the optical axis from the surface to the image plane, D12 is the distance on the optical axis between the positive lens G1p and the lens disposed adjacent to the image side of the positive lens G1p, and the material of the positive lens G2p. Is the Abbe number of νdG2p, νdG3p the Abbe number of the material of the lens G3p, when the Abbe number of the negative lens G1n disposed nearest to the object side among the negative lenses included in the first lens group and the NyudG1n,
LD / f <1.0
0.170 <D12 / LD <0.500
νdG2p> 73.0
νdG3p> 73.0
20.0 <νdG1n <40.0
The following conditional expression is satisfied.

  According to the present invention, it is possible to obtain an optical system which is lightweight and in which aberrations such as chromatic aberration are well corrected.

FIG. 3 is a lens cross-sectional view of the optical system according to the first embodiment. FIG. 3 is an aberration diagram of the optical system according to the first embodiment when focused on infinity. FIG. 9 is a lens cross-sectional view of the optical system according to a second embodiment. FIG. 9 is an aberration diagram of the optical system of Example 2 when focusing on infinity. FIG. 10 is a lens cross-sectional view of the optical system according to a third embodiment. FIG. 13 is an aberration diagram of the optical system of Example 3 when focusing on infinity. FIG. 14 is a lens cross-sectional view of the optical system according to a fourth embodiment. FIG. 14 is an aberration diagram of the optical system of Example 4 when focusing on infinity. FIG. 14 is a lens cross-sectional view of the optical system according to Example 5. FIG. 14 is an aberration diagram of the optical system of Example 5 when focusing on infinity. FIG. 14 is a lens cross-sectional view of the optical system according to Example 6. FIG. 13 is an aberration diagram of the optical system of Example 6 when focusing on infinity. FIG. 14 is a lens cross-sectional view of an optical system according to a seventh embodiment. FIG. 14 is an aberration diagram of the optical system of Example 7 when focusing on infinity. FIG. 16 is a lens cross-sectional view of the optical system according to Example 8. FIG. 14 is an aberration diagram of the optical system of Example 8 when focusing on infinity. FIG. 14 is a lens cross-sectional view of an optical system according to a ninth embodiment. FIG. 21 is an aberration diagram of the optical system of Example 9 when focusing on infinity. FIG. 19 is a lens cross-sectional view of the optical system according to Example 10. FIG. 30 is an aberration diagram of the optical system of Example 10 when focusing on infinity. FIG. 21 is a sectional view of a lens of an optical system according to Example 11; FIG. 28 is an aberration diagram of the optical system of Example 11 when focusing on infinity. FIG. 21 is a lens cross-sectional view of the optical system according to Example 12. FIG. 24 is an aberration diagram of the optical system of Example 12 when focusing on infinity. FIG. 21 is a sectional view of a lens of an optical system according to Example 13; FIG. 28 is an aberration diagram of the optical system of Example 13 when focusing on infinity. 21 is a sectional view of a lens of an optical system according to Example 14. FIG. FIG. 21 is an aberration diagram of the optical system of Example 14 when focusing on infinity. It is a principal part schematic diagram of an imaging device.

  Hereinafter, embodiments of the optical system of the present invention and an imaging apparatus having the same will be described in detail with reference to the accompanying drawings. The optical system of each embodiment includes a first lens group having a positive refractive power, a second lens group having a positive or negative refractive power, and a third lens group having a positive or negative refractive power arranged in order from the object side to the image side. It consists of a lens group. During focusing, the second lens group moves, and the distance between adjacent lens groups changes. Here, the lens group is a lens element that moves integrally at the time of focusing, and may have at least one lens, and does not have to have a plurality of lenses.

  1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 25, and 27 are cross-sectional views of the optical systems of Examples 1 to 14, respectively. FIGS. 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, and 28 respectively show the optical systems of Examples 1 to 14 when focused at infinity. It is an aberration figure.

  FIG. 29 is a schematic diagram showing an embodiment of the imaging device of the present invention. The optical system of each embodiment is a photographic lens system used for an imaging device such as a video camera, a digital camera, a silver halide film camera, and a television camera. In the lens cross-sectional view, the left side is the object side (front), and the right side is the image side (rear). In the lens cross-sectional view, Bi indicates the i-th lens group, where i is the order of the lens groups from the object side to the image side.

  In each embodiment, SP is an aperture stop. In Examples 2, 4, 8, 13, and 14, the aperture stop SP is disposed between the second lens group B2 and the third lens group B3. In the third embodiment, the aperture stop SP is disposed inside the first lens unit B1. In Examples 1, 5, 6, 7, 9, 10, 11, and 12, the aperture stop SP is disposed between the first lens unit B1 and the second lens unit B2.

  The optical systems of Examples 1, 11, and 12 include a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, and a third lens unit having a positive refractive power arranged in order from the object side to the image side. It consists of a lens group. The optical systems of Examples 2, 4, and 8 are arranged in order from the object side to the image side. The first lens group has a positive refractive power, the second lens group has a negative refractive power, and the third lens group has a negative refractive power. It consists of a lens group. The optical systems of the third, fifth, sixth, tenth, thirteenth and fourteenth embodiments are arranged in order from the object side to the image side. The first lens group has a positive refractive power, the second lens group has a positive refractive power, and the negative lens group has a negative refractive power. The third lens group has a refractive power of. The optical systems of Examples 7 and 9 are arranged in order from the object side to the image side. The first lens group has a positive refractive power, the second lens group has a positive refractive power, and the third lens group has a positive refractive power. Consists of

  IP is an image plane. When an optical system is used as an imaging optical system of a video camera or a digital camera, the image plane IP corresponds to a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor. When the optical system of each embodiment is used as an imaging optical system of a silver halide film camera, the image plane IP corresponds to the film plane.

  In the spherical aberration diagram, Fno is an F number, and indicates a spherical aberration with respect to d-line (wavelength 587.6 nm) and g-line (wavelength 435.8 nm). In the astigmatism diagram, ΔS indicates the amount of astigmatism on the sagittal image plane, and ΔM indicates the amount of astigmatism on the meridional image plane. The distortion is shown for the d-line. The chromatic aberration diagram shows the chromatic aberration at the g-line. ω is an imaging half angle of view.

  In each embodiment, as shown by the arrow in the lens cross-sectional view, the second lens unit B2 moves during focusing from infinity to a short distance, and the distance between adjacent lens units changes. In the optical system of each embodiment, the second lens group B2 corresponds to a focus group. In the first, second, fourth, eighth, eleventh, and twelfth embodiments, the second lens unit B2 moves to the image side during focusing from infinity to a short distance. In Examples 3, 5 to 7, 9, 10, 13, and 14, the second lens unit B2 moves toward the object side during focusing from infinity to a short distance.

  Further, in the optical system of each embodiment, it is possible to change the imaging position by moving some of the lenses of the optical system as a vibration-proof group and moving the vibration-proof group in a direction having a component perpendicular to the optical axis. it can. Thereby, image blur correction can be performed. Any one of the first lens group B1, the second lens group B2, and the third lens group B3 may be used as an image stabilizing group, or some lenses included in a specific lens group may be used as an image stabilizing group. .

  In the optical system of each embodiment, the light of the positive lens G1p disposed closest to the object side among the lenses included in the first lens group B1, and the light of the lens disposed adjacent to the image side of the positive lens G1p. The lens arrangement is such that the axial distance is long. Thereby, the effective diameter of the lens disposed closer to the image side than the positive lens G1p can be effectively reduced.

  The positive lens G2p included in the first lens group B1 and disposed on the image side of the positive lens G1p and the positive lens G3p included in the first lens group B1 and disposed on the image side of the positive lens G2p are lowered. It is made of a material with high dispersion and anomalous dispersion. As a result, both reduction in the weight of the optical system and correction of chromatic aberration are achieved.

Here, Abbe number νd and partial dispersion ratio θgF are known as parameters related to correction of chromatic aberration in the optical system. When the refractive indices of the materials for the g-line (wavelength 435.8 nm), F-line (486.1 nm), C-line (656.3 nm), and d-line (587.6 nm) are Ng, NF, NC, and Nd, respectively, Abbe number νd and partial dispersion ratio θgF are
νd = (Nd-1) / (NF-NC)
θgF = (Ng−NF) / (NF−NC)
It is represented by

  In general, the amount of primary chromatic aberration can be reduced by using a low-dispersion material as a material of a positive lens disposed in a lens group having a positive refractive power as a whole. Further, by using a material having a high anomalous dispersion as a material of a positive lens disposed in a lens group having a positive refractive power as a whole, secondary chromatic aberration of magnification can be favorably corrected.

Here, the anomalous dispersion of the material used for the lens is described.
ΔθgF = θgF− (0.6438−0.001682 × νd) (A)
In many materials, the numerical value of the formula (A) is a value near zero. The more the numerical value of the formula (A) deviates from zero, the higher the anomalous dispersion.

The optical system of each embodiment satisfies the following conditional expressions.
LD / f <1.0 (1)
0.170 <D12 / LD <0.500 (2)
νdG2p> 73.0 (3)
νdG3p> 73.0 (4)

  Here, the focal length of the entire optical system is f, and the distance on the optical axis from the most object side lens surface of the first lens unit B1 to the image plane (hereinafter, referred to as the total lens length) is LD. The distance on the optical axis between the positive lens G1p disposed closest to the object side of the lenses included in the first lens group B1 and the lens G2 disposed adjacent to the image side of the positive lens G1p is D12. . The Abbe number of the material of the positive lens G2p included in the first lens group B1 and disposed closer to the image side than the positive lens G1p is νdG2p, and the Abbe number included in the first lens group B1 is disposed closer to the image side than the positive lens G2p. The Abbe number of the material of the positive lens G3p is νdG3p.

  Conditional expression (1) indicates that the distance LD on the optical axis from the lens surface closest to the object side of the first lens unit B1 to the image plane is shorter than the focal length f of the entire optical system. In general, an optical system mounted on a telephoto lens that shortens the overall length of the lens has a longer focal length than the overall length of the lens. If the total length of the lens is longer than the upper limit of conditional expression (1), the size of the optical system becomes large in the optical axis direction, which is not preferable.

  Conditional expression (2) is a conditional expression defining the ratio of the total lens length LD and the distance D12 on the optical axis between the positive lens G1p and the lens G2 disposed adjacent to the image side of the positive lens G1p. In the optical system of each embodiment, the lens G2 corresponds to the positive lens G2p, but the lens G2 may be a different lens from the positive lens G2p.

  If the distance D12 between the positive lens G1p and the lens G2 on the optical axis becomes short below the lower limit value of the conditional expression (2), the effective diameter of the lens G2 becomes too large, and the weight of the optical system increases. Not preferred. If the upper limit of conditional expression (2) is exceeded and the distance D12 on the optical axis between the positive lens G1p and the lens G2 becomes longer, the spherical aberration and chromatic aberration generated by the positive lens G1p will be closer to the image side than the positive lens G1p. It is not preferable because it becomes difficult to perform correction with the disposed lens.

  The conditional expressions (3) and (4) are conditional expressions defining the Abbe number νdG2p of the material of the positive lens G2p and the Abbe number νdG3p of the material of the positive lens G3p, respectively. If the Abbe number νdG2p is smaller than the lower limit value of conditional expression (3), chromatic aberration is likely to occur in the positive lens G2p, which is not preferable. Similarly, if the Abbe number νdG3p is smaller than the lower limit of conditional expression (4), a large amount of chromatic aberration occurs in the positive lens G3p, which is not preferable.

  In each embodiment, as described above, each element is appropriately set so as to satisfy the conditional expressions (1) to (4). Thus, it is possible to obtain an optical system which is lightweight and in which aberrations such as chromatic aberration are well corrected.

In each embodiment, it is preferable to set the numerical ranges of the conditional expressions (1) to (4) as follows.
LD / f <0.98 (1a)
0.175 <D12 / LD <0.450 ... (2a)
νdG2p> 80.0 (3a)
νdG3p> 80.0 (4a)

It is more preferable to set the numerical ranges of the conditional expressions (1) to (4) as follows.
LD / f <0.96 (1b)
0.178 <D12 / LD <0.400 (2b)
νdG2p> 90.0 (3b)
νdG3p> 90.0 (4b)

  In addition, as in the optical systems of Examples 1 to 9 and Examples 11 to 14 described later, by setting D12 / LD to be 0.200 or more, it is possible to further reduce the weight of the optical system.

Further, in each embodiment, it is more preferable to satisfy one or more of the following conditional expressions.
0.020 <θgF_G2p− (0.6438−0.001682 × νdG2p) <0.100 (5)
0.020 <θgF_G3p− (0.6438−0.001682 × νdG3p) <0.100 (6)
LG2p / (LD-D12)> 0.80 (7)
LG3p / (LD-D12)> 0.70 ... (8)
ρG1p <3.0 [g / cm ³ ] (9)
1.50 <fG1p / fG2p <5.00 (10)
1.30 <fG1p / fG3p <5.00 (11)
1.80 <| fG1p / fG1n | <10.00 (12)
20.0 <νdG1n <40.0 (13)

  Here, the partial dispersion ratio of the material of the positive lens G2p is θgF_G2p, the partial dispersion ratio of the material of the positive lens G3p is θgF_G3p, and the distance on the optical axis from the object side lens surface of the positive lens G2p to the image plane is LG2p. . The distance on the optical axis from the object side lens surface of the positive lens G3p to the image plane is LG3p, the specific gravity of the material of the positive lens G1p is ρG1p, the focal length of the positive lens G1p is fG1p, and the focal length of the positive lens G2p is fG2p. The focal length of the positive lens G3p is fG3p. Of the negative lenses included in the first lens unit B1, the focal length of the negative lens G1n disposed closest to the object side is fG1n, and the Abbe number of the material of the negative lens G1n is νdG1n.

  Conditional expression (5) is a conditional expression that defines the anomalous dispersion of the material of the positive lens G2p. By configuring the positive lens G2p using a material having high anomalous dispersion, the effect of correcting secondary chromatic aberration of magnification can be enhanced. A material exceeding the upper limit of conditional expression (5) becomes less practical as an imaging optical system. It is not preferable to use a material below the lower limit of conditional expression (5) as the material of the positive lens G2p because it becomes difficult to sufficiently correct the secondary chromatic aberration of magnification.

  Conditional expression (6) is a conditional expression that defines the anomalous dispersion of the material of the positive lens G3p. By composing the positive lens G3p using a material having high anomalous dispersion, the effect of correcting secondary chromatic aberration of magnification can be enhanced. A material exceeding the upper limit value of the conditional expression (6) becomes less practical as an imaging optical system. It is not preferable to use a material below the lower limit of conditional expression (6) as the material of the positive lens G3p because it becomes difficult to sufficiently correct the secondary chromatic aberration of magnification.

  Conditional expression (7) is a conditional expression that defines the position of the positive lens G2p in the entire optical system. When falling below a lower limit value of conditional expression (7), the distance between the positive lens G1p and the positive lens G2p becomes too long, and the height of an on-axis ray or an off-axis ray entering the positive lens G2p becomes too low. As a result, it becomes difficult to satisfactorily correct secondary chromatic aberration of magnification and axial chromatic aberration in the positive lens G2p, which is not preferable.

  Conditional expression (8) is a conditional expression that defines the position of the positive lens G3p in the entire optical system. When falling below a lower limit value of conditional expression (8), the distance between the positive lens G1p and the positive lens G3p becomes too long, and the height of an on-axis ray or an off-axis ray entering the positive lens G3p becomes too low. As a result, secondary magnification chromatic aberration and axial chromatic aberration cannot be satisfactorily corrected by the positive lens G3p, which is not preferable.

  Conditional expression (9) is an expression that defines the specific gravity ρG1p of the material of the positive lens G1p. If the value exceeds the upper limit of conditional expression (9) and the specific gravity ρG1p of the material of the positive lens G1p increases, the weight of the positive lens G1p increases, making it difficult to reduce the weight of the optical system. Not preferred.

  Conditional expression (10) is a conditional expression that defines the ratio of the focal length fG1p of the positive lens G1p to the focal length fG2p of the positive lens G2p. If the focal length fG1p of the positive lens G1p is short below the lower limit value of the conditional expression (10), the refractive power of the positive lens G1p becomes too strong, and a large amount of axial chromatic aberration occurs in the positive lens G1p. In order to correct the axial chromatic aberration generated by the positive lens G1p by the negative lens included in the first lens unit B1, it is necessary to increase the number of negative lenses, which is not preferable because the weight of the optical system is increased.

  If the focal length fG1p of the positive lens G1p becomes longer than the upper limit of the conditional expression (10), the refractive power of the positive lens G1p becomes too weak. As a result, the light cannot be sufficiently converged by the positive lens G1p, and the effective diameter of the lens disposed on the image side of the positive lens G1p becomes large, which undesirably increases the weight of the optical system.

  Conditional expression (11) is a conditional expression that defines the ratio of the focal length fG1p of the positive lens G1p to the focal length fG3p of the positive lens G3p. If the focal length fG1p of the positive lens G1p is short below the lower limit value of the conditional expression (11), the refractive power of the positive lens G1p becomes too strong, and a large amount of axial chromatic aberration occurs in the positive lens G1p. In order to correct the axial chromatic aberration generated by the positive lens G1p by the negative lens included in the first lens unit B1, it is necessary to increase the number of negative lenses, which is not preferable because the weight of the optical system is increased.

  If the focal length fG1p of the positive lens G1p is longer than the upper limit of conditional expression (11), the refractive power of the positive lens G1p becomes too weak. As a result, the light cannot be sufficiently converged by the positive lens G1p, and the effective diameter of the lens disposed on the image side of the positive lens G1p becomes large, which undesirably increases the weight of the optical system.

  Conditional expression (12) is a conditional expression that defines the ratio of the focal length fG1p of the positive lens G1p to the focal length fG1n of the negative lens G1n. If the focal length fG1p of the positive lens G1p is short below the lower limit value of the conditional expression (12), the refractive power of the positive lens G1p becomes too strong, and a large amount of axial chromatic aberration is generated in the positive lens G1p. If the focal length fG1n of the negative lens G1n is longer than the lower limit of conditional expression (12), the refractive power of the negative lens G1n becomes too weak. As a result, it is difficult to correct axial chromatic aberration and spherical aberration generated by the positive lens G1p by the negative lens G1n, which is not preferable.

  If the focal length fG1p of the positive lens G1p is longer than the upper limit of conditional expression (12), the refractive power of the positive lens G1p becomes too weak. As a result, the light cannot be sufficiently converged by the positive lens G1p, and the effective diameter of the lens disposed on the image side of the positive lens G1p becomes large, which undesirably increases the weight of the optical system.

  Conditional expression (13) is a conditional expression defining the Abbe number νdG1n of the material of the negative lens G1n. By using a high-dispersion material as the material of the negative lens G1n included in the first lens unit B1 having a positive refractive power, primary chromatic aberration can be corrected well. If the lower limit of conditional expression (13) is not reached, chromatic aberration of magnification is excessively corrected in the negative lens G1n, which is not preferable. If the value exceeds the upper limit of conditional expression (13), it is difficult to sufficiently correct lateral chromatic aberration in the negative lens G1n, which is not preferable.

Preferably, the numerical ranges of the conditional expressions (5) to (13) are set as follows.
0.030 <θgF_G2p− (0.6438−0.001682 × νdG2p) <0.080 (5a)
0.025 <θgF_G3p− (0.6438−0.001682 × νdG3p) <0.080 (6a)
LG2p / (LD-D12)> 0.85 ... (7a)
LG3p / (LD-D12)> 0.75 ... (8a)
ρG1p <2.8 [g / cm ³ ] (9a)
1.60 <fG1p / fG2p <4.50 (10a)
1.40 <fG1p / fG3p <4.50 (11a)
1.90 <| fG1p / fG1n | <8.00 (12a)
21.0 <νdG1n <39.0 (13a)

More preferably, the numerical ranges of the conditional expressions (5) to (13) are set as follows.
0.040 <θgF_G2p− (0.6438−0.001682 × νdG2p) <0.070 (5b)
0.030 <θgF_G3p− (0.6438−0.001682 × νdG3p) <0.070 (6b)
LG2p / (LD-D12)> 0.90 ... (7b)
LG3p / (LD-D12)> 0.80 ... (8b)
ρG1p <2.7 [g / cm ³ ] (9b)
1.70 <fG1p / fG2p <4.00 (10b)
1.50 <fG1p / fG3p <4.00 (11b)
2.00 <| fG1p / fG1n | <7.00 (12b)
23.0 <νdG1n <38.5 (13b)

  Note that the second lens unit B2 that moves during focusing preferably includes a positive lens and a negative lens. This makes it possible to suppress chromatic aberration during focusing, in particular, fluctuation of axial chromatic aberration.

  In addition, it is preferable that the second lens group B2 includes two or less lenses. As a result, the weight of the focus group can be reduced, and the size and weight of the mechanical mechanism for driving the second lens group B2, which is the focus group, can be reduced.

  Further, in the optical system of each embodiment, it is preferable that the first lens unit B1 be stationary during focusing. The first lens unit B1 disposed closest to the object side among the lens units constituting the optical system has a large effective diameter and is heavy. In order to move the heavy first lens unit B1 during focusing, a large driving mechanism is required, which undesirably increases the weight of the optical system and the imaging apparatus including the optical system.

  Next, Numerical Embodiments 1 to 14 corresponding to Embodiments 1 to 14 of the present invention will be described. In each numerical example, i indicates the order of the optical surface from the object side. ri is the radius of curvature of the i-th optical surface (i-th surface), di is the distance between the i-th surface and the (i + 1) -th surface, and ndi and νdi are the refraction of the material of the i-th optical member with respect to the d-line, respectively. Shows the rate and Abbe number. As for the change in the distance between the lens surfaces, the distance between the lens surfaces when focusing on infinity and the distance between the lens surfaces when focusing on the closest distance are described.

  In each embodiment, the back focus (BF) represents the distance from the most image-side surface of the optical system to the image surface in terms of air conversion length. Table 1 shows the correspondence between the above-described conditional expressions and the numerical examples. In Table 1, ΔθgF_Gi indicates a numerical value of θgF_Gi− (0.6438−0.001682 × νdi).

  In each embodiment, a protective glass for protecting the lens may be disposed on the object side of the first lens unit B1. It is assumed that the protective glass having an extremely low refractive power is not included in the first lens group B1.

[Numerical Example 1]
Unit: mm
Surface data surface number rd nd νd Effective diameter θgF ΔθgF
1 150.642 16.15 1.59270 35.3 135.36
2 730.042 100.00 134.20
3 107.703 14.79 1.43387 95.1 84.27 0.5373 0.0534
4 -328.442 0.27 82.15
5 -318.403 3.00 1.85478 24.8 81.94
6 87.265 3.08 76.51
7 88.737 12.63 1.43387 95.1 76.87 0.5373 0.0534
8 -1026.629 35.00 76.22
9 68.568 6.10 1.89286 20.4 62.07
10 127.179 5.00 60.58
11 68.368 2.30 1.65412 39.7 55.04
12 43.418 1.15 51.09
13 48.830 7.97 1.43387 95.1 51.07
14 133.424 7.57 49.03
15 (aperture) ∞ (variable) 44.73
16 -3151.717 1.87 1.91082 35.3 40.00
17 61.271 (variable) 38.04
18 97.234 1.76 1.92286 20.9 33.23
19 63.011 9.17 1.56732 42.8 32.60
20 -96.758 1.07 33.13
21 110.488 4.14 1.85025 30.1 32.94
22 -106.157 1.44 1.59522 67.7 32.67
23 36.770 5.26 31.16
24 -77.293 1.47 1.72916 54.7 31.20
25 75.820 4.11 32.49
26 89.505 10.00 1.64769 33.8 36.21
27 -216.973 0.15 38.52
28 77.954 12.44 1.73800 32.3 39.99
29 -58.563 2.00 1.80809 22.8 39.98
30 ∞ 65.15 40.13
Image plane ∞

Various data focal length 392.55
F-number 2.90
Half angle of view 3.15
Image height 21.64
Lens length 371.25
BF 65.15

∞ -0.16 times
d15 5.89 20.04
d17 30.34 16.19

Entrance pupil position 532.27
Exit pupil position -104.85
Front principal point position 18.38
Rear principal point position -327.40

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 175.07 215.00 163.73 -118.69
2 16 -65.97 1.87 0.96 -0.02
3 18 183.65 53.01 23.36 -15.91

Single lens Data lens Start surface Focal length
1 1 316.96
2 3 188.88
3 5 -79.86
4 7 188.90
5 9 158.84
6 11 -188.77
7 13 172.59
8 16 -65.97
9 18 -198.89
10 19 68.69
11 21 64.24
12 22 -45.71
13 24 -52.28
14 26 99.10
15 28 47.14
16 29 -72.47

[Numerical example 2]
Unit: mm
Surface data surface number rd nd νd Effective diameter θgF ΔθgF
1 304.232 11.77 1.59551 39.2 134.48
2 -3473.263 130.00 133.88
3 135.555 14.53 1.43387 95.1 93.09 0.5373 0.0534
4 -474.298 0.42 91.37
5 -431.027 4.00 1.73800 32.3 91.22
6 247.150 3.00 88.10
7 88.485 12.33 1.43387 95.1 85.53 0.5373 0.0534
8 462.085 1.00 83.92
9 73.802 4.50 1.65412 39.7 77.43
10 57.758 (variable) 72.10
11 249.332 8.55 1.80809 22.8 60.63
12 -145.324 2.60 1.85478 24.8 59.32
13 149.847 (variable) 56.49
14 (aperture) ∞ 6.99 40.88
15 236.895 1.90 1.83481 42.7 38.53
16 79.511 5.11 1.53775 74.7 37.72
17 -211.462 41.94 37.34
18 270.103 2.34 1.80518 25.4 20.27
19 -92.625 1.62 1.62299 58.2 19.86
20 39.986 2.11 18.85
21 -65.825 1.57 1.77250 49.6 18.79
22 149.119 2.19 19.24
23 80.993 3.17 1.63980 34.5 20.64
24 -114.908 50.87 21.09
25 -494.014 7.22 1.67270 32.1 33.69
26 -29.034 1.80 1.83481 42.7 34.04
27 143.833 1.45 36.41
28 81.978 9.87 1.73800 32.3 38.45
29 -38.887 1.80 1.92286 18.9 38.93
30 -74.668 65.00 40.16
Image plane ∞

Various data focal length 780.00
F-number 5.80
Half angle of view 1.59
Image height 21.64
Total lens length 490.00
BF 65.00

∞ -0.15 times
d10 35.94 72.66
d13 54.41 17.69

Entrance pupil position 862.03
Exit pupil position -239.64
Front principal point position -355.06
Rear principal point position -715.00

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 298.08 181.56 38.61 -127.38
2 11 -374.69 11.15 13.67 7.28
3 14 -654.05 141.95 -152.97 -439.31

Single lens Data lens Start surface Focal length
1 1 470.28
2 3 244.75
3 5 -212.31
4 7 249.75
5 9 -456.83
6 11 114.73
7 12 -85.96
8 15 -144.16
9 16 108.12
10 18 85.91
11 19 -44.62
12 21 -58.93
13 23 74.73
14 25 45.57
15 26 -28.80
16 28 37.02
17 29 -90.11

[Numerical example 3]
Unit: mm
Surface data surface number rd nd νd Effective diameter θgF ΔθgF
1 302.631 13.68 1.53172 48.8 141.98
2 -1528.554 150.00 141.38
3 111.159 17.83 1.43387 95.1 91.72 0.5373 0.0534
4 -262.152 0.30 89.76
5 -272.660 3.80 1.73800 32.3 89.31
6 128.018 0.50 84.42
7 82.578 13.73 1.43387 95.1 84.07 0.5373 0.0534
8 648.537 62.47 82.66
9 (aperture) ∞ 1.50 51.15
10 74.152 9.64 1.80809 22.8 48.30
11 -92.697 1.50 1.90315 29.8 46.76
12 56.781 (variable) 42.24
13 100.319 1.80 1.80809 22.8 29.08
14 56.270 4.40 1.90366 31.3 28.33
15 157.977 (variable) 27.36
16 69.858 4.69 1.85478 24.8 25.00
17 -79.548 1.62 1.76385 48.5 23.95
18 39.816 2.99 23.03
19 -78.851 1.57 1.91082 35.3 23.10
20 119.107 3.02 23.76
21 122.941 4.72 1.51633 64.1 25.73
22 -49.179 2.56 26.47
23 -43.755 1.70 1.76385 48.5 26.94
24 -95.999 22.67 28.05
25 218.669 8.46 1.73800 32.3 39.79
26 -43.667 1.90 1.92286 18.9 40.29
27 -79.787 85.94 41.38
Image plane ∞

Various data focal length 584.98
F-number 4.12
Half angle of view 2.12
Image height 21.64
Total lens length 476.10
BF 85.94

∞ -0.14 times
d12 48.06 4.82
d15 5.05 48.29

Entrance pupil position 618.32
Exit pupil position -265.10
Front principal point position 228.49
Rear principal point position -499.04

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 492.97 274.95 -443.17 -343.41
2 13 238.41 6.20 -4.10 -7.28
3 16 -1576.39 55.91 -594.87 -1036.81

Single lens Data lens Start surface Focal length
1 1 476.33
2 3 182.55
3 5 -117.57
4 7 216.51
5 10 52.33
6 11 -38.80
7 13 -161.53
8 14 94.77
9 16 44.15
10 17 -34.54
11 19 -51.89
12 21 68.67
13 23 -106.76
14 25 50.01
15 26 -107.23

[Numerical example 4]
Unit: mm
Surface data surface number rd nd νd Effective diameter θgF ΔθgF
1 303.500 14.27 1.48749 70.2 141.99
2 -1119.197 125.00 141.42
3 133.848 18.28 1.43387 95.1 100.56 0.5373 0.0534
4 -278.409 1.00 98.74
5 -272.653 4.45 1.67300 38.1 97.88
6 341.744 7.63 93.96
7 85.208 13.41 1.43387 95.1 88.08 0.5373 0.0534
8 451.394 1.00 86.17
9 68.525 5.00 1.51742 52.4 77.54
10 52.234 (variable) 70.88
11 477.269 7.06 1.80809 22.8 64.98
12 -180.144 2.60 1.85025 30.1 63.77
13 158.963 (variable) 60.68
14 (aperture) ∞ 6.99 43.66
15 1790.868 1.90 1.83481 42.7 41.15
16 53.608 8.55 1.59522 67.7 40.01
17 -120.253 17.05 39.67
18 99.470 4.03 1.80518 25.4 31.84
19 -110.952 1.62 1.62299 58.2 31.25
20 41.547 4.33 28.91
21 -68.903 1.57 1.77250 49.6 28.86
22 209.179 3.12 29.01
23 99.162 3.52 1.73800 32.3 29.71
24 -277.851 48.07 29.67
25 161.753 6.28 1.73800 32.3 39.71
26 -73.339 1.90 1.92286 18.9 39.80
27 -283.372 93.89 40.13
Image plane ∞

Various data focal length 584.99
F-number 4.12
Half angle of view 2.12
Image height 21.64
Total lens length 476.09
BF 93.89

∞ -0.14 times
d10 22.54 47.33
d13 51.04 26.25

Entrance pupil position 786.58
Exit pupil position -161.90
Front principal point position 33.70
Rear principal point position -491.10

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 241.29 190.04 75.74 -108.88
2 11 -260.30 9.66 7.63 2.26
3 14 -13347.44 108.92 -4161.70 -6209.10

Single lens Data lens Start surface Focal length
1 1 491.38
2 3 211.17
3 5 -224.69
4 7 239.44
5 9 -474.28
6 11 162.62
7 12 -98.97
8 15 -66.23
9 16 63.46
10 18 65.70
11 19 -48.32
12 21 -66.93
13 23 99.42
14 25 69.16
15 26 -107.69

[Numerical example 5]
Unit: mm
Surface data surface number rd nd νd Effective diameter θgF ΔθgF
1 256.651 12.30 1.53172 48.8 118.70
2 -898.293 100.00 118.14
3 123.678 14.23 1.43387 95.1 82.63 0.5373 0.0534
4 -250.852 0.30 80.94
5 -236.670 3.50 1.73800 32.3 80.85
6 159.068 1.00 77.47
7 73.782 12.65 1.43387 95.1 76.56 0.5373 0.0534
8 562.749 1.00 75.14
9 50.236 3.50 1.73800 32.3 67.65
10 44.936 47.20 63.78
11 81.633 7.02 1.80809 22.8 45.69
12 -345.170 2.00 1.90366 31.3 44.08
13 59.571 12.67 40.95
14 (aperture) ∞ (variable) 38.36
15 72.373 1.85 1.90366 31.3 30.81
16 70.798 3.44 1.53775 74.7 30.16
17 618.776 (variable) 29.48
18 112.273 3.56 1.84666 23.8 28.12
19 -85.446 1.61 1.77250 49.6 27.52
20 43.801 3.33 25.58
21 -71.870 1.50 1.91082 35.3 25.51
22 7154.260 12.83 25.59
23 -86.248 2.42 1.61340 44.3 29.01
24 -66.648 20.00 29.85
25 134.333 8.24 1.67300 38.1 39.36
26 -50.197 1.80 1.80809 22.8 39.68
27 -115.724 106.46 40.39
Image plane ∞

Various data focal length 489.05
F-number 4.12
Half angle of view 2.53
Image height 21.64
Lens length 411.08
BF 106.46

∞ -0.14 times
d14 24.67 2.00
d17 2.00 24.67

Entrance pupil position 565.70
Exit pupil position -158.34
Front principal point position 151.57
Rear principal point position -382.58

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 414.18 204.70 -309.53 -268.47
2 14 152.99 29.96 23.47 -4.38
3 18 -441.84 55.28 -166.34 -347.04

Single lens Data lens Start surface Focal length
1 1 376.81
2 3 193.15
3 5 -128.42
4 7 194.19
5 9 -802.16
6 11 82.30
7 12 -56.09
8 15 -8138.48
9 16 148.34
10 18 57.78
11 19 -37.28
12 21 -78.11
13 23 456.65
14 25 55.29
15 26 -111.07

[Numerical example 6]
Unit: mm
Surface data surface number rd nd νd Effective diameter θgF ΔθgF
1 303.613 11.69 1.54814 45.8 118.70
2 -720.087 95.00 118.22
3 145.704 14.21 1.43387 95.1 85.77 0.5373 0.0534
4 -228.748 0.30 84.22
5 -214.415 3.50 1.74950 35.3 84.19
6 190.939 2.00 81.27
7 78.997 14.38 1.43387 95.1 80.42 0.5373 0.0534
8 1108.619 1.00 78.73
9 54.119 3.50 1.73800 32.3 71.00
10 47.476 66.65 66.93
11 87.668 4.79 1.80809 22.8 42.48
12 171.534 2.00 1.91082 35.3 40.89
13 66.228 7.96 39.19
14 (aperture) ∞ (variable) 37.65
15 76.142 1.85 1.90366 31.3 29.64
16 75.600 3.27 1.53775 74.7 29.01
17 778.003 (variable) 28.33
18 123.763 3.56 1.84666 23.8 26.99
19 -70.153 1.61 1.77250 49.6 26.40
20 41.736 3.54 24.48
21 -68.635 1.50 1.91082 35.3 24.32
22 -1082.263 4.25 24.42
23 -62.341 2.40 1.67300 38.1 24.59
24 -48.987 31.15 25.36
25 107.183 8.24 1.67300 38.1 39.48
26 -54.390 1.80 1.80809 22.8 39.71
27 -153.673 94.42 40.28
Image plane ∞

Various data focal length 489.05
F-number 4.12
Half angle of view 2.53
Image height 21.64
Lens length 411.08
BF 94.42

∞ -0.14 times
d14 24.52 2.00
d17 2.00 24.52

Entrance pupil position 605.93
Exit pupil position -158.62
Front principal point position 149.81
Rear principal point position -394.63

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 383.47 219.01 -229.79 -254.89
2 14 155.98 29.64 23.46 -4.15
3 18 -376.55 58.04 -140.90 -308.38

Single lens Data lens Start surface Focal length
1 1 391.20
2 3 207.53
3 5 -134.26
4 7 195.22
5 9 -675.14
6 11 216.37
7 12 -119.52
8 15 18912.95
9 16 155.46
10 18 53.33
11 19 -33.66
12 21 -80.51
13 23 316.92
14 25 54.73
15 26 -105.03

[Numerical example 7]
Unit: mm
Surface data surface number rd nd νd Effective diameter θgF ΔθgF
1 272.017 15.63 1.53172 48.8 135.37
2 -661.466 75.00 134.73
3 161.777 18.72 1.43387 95.1 101.09 0.5373 0.0534
4 -196.205 0.20 99.09
5 -199.530 4.30 1.73800 32.3 98.73
6 281.165 0.50 94.56
7 92.859 12.89 1.43387 95.1 92.38 0.5373 0.0534
8 395.372 50.00 90.76
9 91.563 6.68 1.92286 18.9 57.92
10 21 270.468 1.80 1.85478 24.8 56.63
11 53.190 17.97 51.03
12 (aperture) ∞ (variable) 47.07
13 72.592 5.63 1.59522 67.7 34.46
14 -269.274 1.70 1.51633 64.1 33.25
15 189.489 (variable) 32.01
16 133.885 4.62 1.84666 23.8 27.82
17 -109.073 1.71 1.65160 58.5 26.59
18 41.354 3.05 24.48
19 -76.188 1.63 1.88300 40.8 24.53
20 142.443 11.01 25.43
21 523.344 5.91 1.61340 44.3 33.31
22 -41.876 2.00 1.69895 30.1 34.14
23 -87.849 17.30 35.78
24 86.521 9.20 1.61340 44.3 45.71
25 -70.765 1.91 1.80809 22.8 45.84
26 -141.307 60.00 46.30
Image plane ∞

Various data focal length 392.57
F-number 2.90
Half angle of view 3.15
Image height 21.64
Total lens length 371.15
BF 60.00

∞ -0.16 times
d12 34.43 1.00
d15 7.36 40.79

Entrance pupil position 497.61
Exit pupil position -312.22
Front principal point position 476.15
Rear principal point position -332.57

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 394.38 185.72 -252.79 -240.54
2 12 170.54 41.75 32.44 -6.55
3 16 591.22 58.35 271.96 414.18

Single lens Data lens Start surface Focal length
1 1 364.63
2 3 207.65
3 5 -157.54
4 7 276.16
5 9 99.63
6 10 -62.38
7 13 96.66
8 14 -215.14
9 16 71.62
10 17 -45.81
11 19 -56.02
12 21 63.46
13 22 -116.57
14 24 64.91
15 25 -177.56

[Numerical example 8]
Unit: mm
Surface data surface number rd nd νd Effective diameter θgF ΔθgF
1 385.526 13.44 1.51823 58.9 134.25
2 -571.729 77.00 133.81
3 138.510 20.20 1.43387 95.1 105.47 0.5373 0.0534
4 -239.954 0.88 103.58
5 -236.997 4.45 1.72047 34.7 102.71
6 413.620 1.96 98.82
7 89.685 13.98 1.49700 81.5 94.58 0.5375 0.0309
8 401.260 1.00 92.61
9 73.362 4.00 1.51633 64.1 83.23
10 55.381 (variable) 76.71
11 676.714 8.83 1.80809 22.8 71.19
12 -131.916 2.50 1.85025 30.1 69.98
13 177.931 (variable) 66.25
14 (aperture) ∞ 6.99 47.46
15 389.162 1.90 1.83481 42.7 44.83
16 50.248 10.20 1.59522 67.7 43.35
17 -104.244 21.30 42.94
18 62.380 4.41 1.80518 25.4 30.44
19 -125.782 1.62 1.62299 58.2 29.62
20 29.348 4.45 26.31
21 -76.872 1.50 1.77250 49.6 26.33
22 90.429 3.40 27.45
23 62.033 5.17 1.73800 32.3 31.17
24 -269.003 11.30 31.75
25 63.333 7.28 1.73800 32.3 35.82
26 -65.540 1.50 1.92286 18.9 35.62
27 179.797 60.88 35.48
Image plane ∞

Various data focal length 392.00
F-number 2.92
Half angle of view 3.16
Image height 21.64
Lens total length 371.00
BF 60.88

∞ -0.17 times
d10 23.34 58.96
d13 57.54 21.92

Entrance pupil position 604.24
Exit pupil position -69.07
Front principal point position -186.31
Rear principal point position -331.12

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 218.77 136.91 38.12 -80.51
2 11 -258.49 11.33 8.11 1.81
3 14 -1780.17 81.01 39.35 -30.56

Single lens Data lens Start surface Focal length
1 1 446.46
2 3 205.73
3 5 -208.53
4 7 228.98
5 9 -473.50
6 11 137.28
7 12 -88.77
8 15 -69.29
9 16 58.40
10 18 52.34
11 19 -38.04
12 21 -53.58
13 23 68.76
14 25 44.72
15 26 -51.89

[Numerical Example 9]
Unit: mm
Surface data surface number rd nd νd Effective diameter θgF ΔθgF
1 253.206 15.70 1.53172 48.8 135.37
2 -794.645 80.00 134.68
3 120.312 19.13 1.43387 95.1 98.20 0.5373 0.0534
4 -255.664 0.27 95.99
5 -251.994 4.30 1.73800 32.3 95.75
6 185.815 2.00 90.53
7 78.093 14.41 1.43387 95.1 87.97 0.5373 0.0534
8 395.372 1.00 86.16
9 65.333 5.00 1.73800 32.3 77.77
10 52.898 55.75 71.52
11 131.577 5.85 1.92286 18.9 47.81
12 -173.016 1.80 2.00100 29.1 46.87
13 79.693 5.11 44.10
14 (aperture) ∞ (variable) 43.54
15 84.346 5.20 1.76385 48.5 34.24
16 -330.244 1.50 1.78760 23.4 33.22
17 500.351 (variable) 32.49
18 119.964 5.15 1.84666 23.8 28.83
19 -81.582 1.71 1.67790 55.3 27.56
20 38.192 3.96 26.61
21 -65.854 1.63 1.76200 40.1 26.66
22 131.367 11.01 27.85
23 595.238 4.99 1.51633 64.1 36.10
24 -86.999 10.16 37.37
25 76.297 10.02 1.61340 44.3 44.95
26 -60.967 1.91 1.92286 18.9 45.06
27 -120.249 66.01 45.73
Image plane ∞

Various data focal length 392.57
F-number 2.90
Half angle of view 3.15
Image height 21.64
Total lens length 371.15
BF 66.01

∞ -0.16 times
d14 31.55 1.00
d17 6.03 36.58

Entrance pupil position 548.07
Exit pupil position -202.24
Front principal point position 366.12
Rear principal point position -326.56

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 478.88 205.21 -475.87 -321.17
2 14 133.94 38.25 30.72 -4.59
3 18 3089.85 50.55 1169.58 1813.90

Single lens Data lens Start surface Focal length
1 1 363.02
2 3 191.51
3 5 -144.32
4 7 221.25
5 9 -454.12
6 11 81.74
7 12 -54.31
8 15 88.44
9 16 -252.39
10 18 58.03
11 19 -38.15
12 21 -57.36
13 23 147.38
14 25 56.82
15 26 -136.11

[Numerical example 10]
Unit: mm
Surface data surface number rd nd νd Effective diameter θgF ΔθgF
1 294.571 10.93 1.59270 35.3 100.87
2 -427.284 50.00 100.40
3 87.155 16.09 1.43387 95.1 78.40 0.5373 0.0534
4 -250.471 0.20 76.31
5 -248.732 3.30 1.85478 24.8 76.12
6 245.249 0.30 73.12
7 57.005 12.25 1.43387 95.1 69.69 0.5373 0.0534
8 208.094 0.50 67.55
9 48.647 4.50 1.85478 24.8 60.46
10 39.822 34.21 54.77
11 110.427 4.43 1.92286 18.9 38.11
12 -234.759 1.50 1.91082 35.3 37.06
13 45.695 5.31 34.20
14 (aperture) ∞ (variable) 33.67
15 48.513 6.40 1.59522 67.7 28.74
16 -47.434 1.70 1.72916 54.7 27.90
17 -203.760 (variable) 26.86
18 118.337 4.05 1.84666 23.9 24.81
19 -53.903 1.50 1.77250 49.6 23.88
20 34.010 3.73 22.69
21 -53.303 1.50 1.80610 40.9 22.89
22 148.382 15.17 24.15
23 580.743 4.75 1.51742 52.4 37.96
24 -79.778 0.20 39.06
25 79.802 10.01 1.65412 39.7 42.17
26 -47.847 1.80 1.92286 18.9 42.40
27 -95.313 60.48 43.34
Image plane ∞

Various data focal length 292.52
F-number 2.90
Half angle of view 4.23
Image height 21.64
Total lens length 273.26
BF 60.48

∞ -0.17 times
d14 16.44 1.00
d17 1.99 17.44

Entrance pupil position 343.18
Exit pupil position -133.95
Front principal point position 195.61
Rear principal point position -232.04

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 383.25 138.21 -430.69 -251.00
2 14 77.20 24.54 16.95 -4.53
3 18 -683.60 42.71 -275.39 -521.08

Single lens Data lens Start surface Focal length
1 1 295.85
2 3 151.20
3 5 -144.03
4 7 176.63
5 9 -335.68
6 11 81.88
7 12 -41.89
8 15 41.32
9 16 -85.18
10 18 44.22
11 19 -26.79
12 21 -48.49
13 23 135.90
14 25 47.19
15 26 -106.04

[Numerical example 11]
Unit: mm
Surface data surface number rd nd νd Effective diameter θgF ΔθgF
1 99.464 14.87 1.59270 35.3 101.04
2 456.909 64.58 99.29
3 80.681 11.90 1.43387 95.1 62.00 0.5373 0.0534
4 -167.967 0.15 60.11
5 -166.869 2.30 1.85478 24.8 59.92
6 51.072 0.15 54.95
7 50.726 11.60 1.43387 95.1 55.04 0.5373 0.0534
8 -770.506 10.68 54.62
9 59.715 3.81 1.89286 20.4 50.66
10 74.063 8.36 49.33
11 58.185 2.00 1.65412 39.7 45.60
12 45.596 1.04 43.86
13 51.918 6.42 1.90366 31.3 43.79
14 206.154 3.00 42.24
15 (aperture) ∞ (variable) 40.40
16 2015.159 1.90 1.91082 35.3 37.51
17 32.641 3.50 1.84666 23.8 34.33
18 43.038 (variable) 33.42
19 64.610 5.62 1.49700 81.5 31.81
20 -78.046 1.00 31.84
21 469.814 3.84 1.85478 24.8 30.43
22 -64.210 1.50 1.60311 60.6 30.18
23 33.512 7.59 28.87
24 -47.827 1.50 1.60311 60.6 29.44
25 93.980 2.80 31.60
26 77.014 6.40 1.59551 39.2 36.97
27 -82.425 0.42 37.69
28 108.793 10.03 1.85478 24.8 38.99
29 -32.591 2.00 1.89286 20.4 38.97
30 1236.437 63.67 39.14
Image plane ∞

Various data focal length 292.46
F-number 2.90
Half angle of view 4.23
Image height 21.64
Total lens length 273.23
BF 63.67

∞ -0.16 times
d12 2.91 10.48
d15 17.66 10.09

Entrance pupil position 301.22
Exit pupil position -69.46
Front principal point position -48.75
Rear principal point position -228.78

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 112.19 140.87 122.13 -68.98
2 16 -47.10 5.40 2.77 -0.11
3 19 167.49 42.71 18.20 -15.09

Single lens Data lens Start surface Focal length
1 1 211.24
2 3 127.46
3 5 -45.53
4 7 110.16
5 9 306.80
6 11 -343.79
7 13 75.30
8 16 -36.44
9 17 138.24
10 19 72.07
11 21 66.31
12 22 -36.30
13 24 -52.35
14 26 67.87
15 28 30.33
16 29 -35.54

[Numerical example 12]
Unit: mm
Surface data surface number rd nd νd Effective diameter θgF ΔθgF
1 178.783 15.20 1.59270 35.3 135.31
2 1415.744 124.89 134.26
3 108.327 15.15 1.43387 95.1 78.98 0.5373 0.0534
4 -192.136 0.15 76.97
5 -197.207 3.00 1.85478 24.8 76.67
6 76.176 0.15 71.84
7 73.738 12.64 1.43387 95.1 72.03 0.5373 0.0534
8 13386.147 11.63 71.67
9 86.704 5.89 1.89286 20.4 68.81
10 159.733 33.10 67.66
11 69.154 2.30 1.65412 39.7 49.89
12 45.945 1.53 47.30
13 55.402 8.24 1.66672 48.3 47.22
14 2426.623 3.00 45.60
15 (aperture) ∞ (variable) 42.92
16 174.740 2.00 1.90366 31.3 40.00
17 37.347 4.13 1.49700 81.5 36.73
18 52.890 (variable) 35.68
19 87.342 4.14 1.84666 23.8 31.49
20 403.419 1.07 31.05
21 95.943 4.24 1.85478 24.8 32.55
22 -94.709 1.50 1.76385 48.5 32.10
23 38.328 6.23 30.47
24 -80.394 1.50 1.76385 48.5 30.84
25 109.369 3.26 32.09
26 72.385 12.53 1.67300 38.1 34.59
27 -32.147 1.70 1.59522 67.7 35.84
28 -300.120 0.15 37.16
29 144.097 9.42 1.85478 24.8 37.64
30 -34.206 2.00 1.89286 20.4 37.67
31 1892.910 62.96 37.94
Image plane ∞

Various data focal length 392.56
F-number 2.90
Half angle of view 3.15
Image height 21.64
Lens length 371.23
BF 62.96

∞ -0.15 times
d12 2.00 13.67
d15 15.51 3.84

Entrance pupil position 626.88
Exit pupil position -63.48
Front principal point position -199.43
Rear principal point position -329.61

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 156.52 236.90 265.60 -109.21
2 16 -66.00 6.13 3.14 -0.67
3 19 520.43 47.74 46.30 13.75

Single lens Data lens Start surface Focal length
1 1 343.67
2 3 162.13
3 5 -63.96
4 7 170.85
5 9 204.61
6 11 -217.83
7 13 84.92
8 16 -52.93
9 17 234.98
10 19 130.88
11 21 56.34
12 22 -35.55
13 24 -60.45
14 26 34.75
15 27 -60.63
16 29 33.15
17 30 -37.61

[Numerical example 13]
Unit: mm
Surface data surface number rd nd νd Effective diameter θgF ΔθgF
1 163.339 13.35 1.59270 35.3 120.06
2 943.811 144.80 118.94
3 104.653 12.00 1.43387 95.1 61.40 0.5373 0.0534
4 -116.617 0.15 59.82
5 -117.086 2.30 1.85478 24.8 59.62
6 80.844 0.15 57.15
7 77.117 12.13 1.43387 95.1 57.26 0.5373 0.0534
8 -114.243 0.15 57.03
9 95.689 3.57 1.89286 20.4 54.37
10 129.498 4.81 53.26
11 -174.822 2.00 1.48749 70.2 53.26
12 146.631 (variable) 51.87
13 107.088 10.02 1.64769 33.8 49.80
14 -72.534 2.20 1.58913 61.1 49.14
15 -4440.551 (variable) 47.39
16 (aperture) ∞ 8.01 40.94
17 702.560 1.90 1.84666 23.8 36.97
18 47.597 7.46 1.61340 44.3 35.58
19 -126.474 19.15 35.02
20 122.013 3.76 1.84666 23.8 26.80
21 -71.635 1.40 1.76385 48.5 26.39
22 34.538 6.95 25.37
23 -64.820 1.40 1.76385 48.5 26.15
24 90.115 2.28 27.35
25 139.671 9.08 1.73800 32.3 29.11
26 -21.978 1.70 1.76385 48.5 30.01
27 -232.122 0.96 32.79
28 78.499 8.15 1.73800 32.3 34.89
29 -47.550 1.90 1.89286 20.4 35.24
30 -127.714 82.50 35.96
Image plane ∞

Various data focal length 488.82
F-number 4.10
Half angle of view 2.53
Image height 21.64
Lens length 411.15
BF 82.50

∞ -0.14 times
d12 43.95 24.39
d15 2.95 22.51

Entrance pupil position 760.74
Exit pupil position -70.30
Front principal point position -314.21
Rear principal point position -406.33

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 680.35 195.41 -475.01 -383.69
2 13 143.84 12.22 0.85 -6.65
3 16 -147.89 74.11 8.88 -61.93

Single lens Data lens Start surface Focal length
1 1 331.15
2 3 129.25
3 5 -55.65
4 7 108.19
5 9 391.00
6 11 -163.25
7 13 68.26
8 14 -125.19
9 17 -60.38
10 18 57.31
11 20 53.79
12 21 -30.33
13 23 -49.16
14 25 26.36
15 26 -31.89
16 28 41.26
17 29 -85.80

[Numerical example 14]
Unit: mm
Surface data surface number rd nd νd Effective diameter θgF ΔθgF
1 168.552 14.91 1.59270 35.3 133.65
2 853.592 122.18 132.49
3 148.612 11.95 1.43387 95.1 81.00 0.5373 0.0534
4 -254.303 0.15 79.55
5 -257.480 3.20 1.85478 24.8 79.38
6 141.530 0.15 76.27
7 127.364 12.78 1.43387 95.1 76.25 0.5373 0.0534
8 -174.232 0.15 75.68
9 577.170 3.41 1.89286 20.4 72.87
10 4707.875 3.60 72.09
11 -190.967 3.00 1.80400 46.6 72.07
12 1388.400 (variable) 71.03
13 145.654 7.22 1.59551 39.2 58.51
14 -226.906 2.80 1.67790 55.3 57.84
15 984.208 (variable) 56.57
16 (aperture) ∞ 63.32 45.47
17 -414.599 1.20 1.76385 48.5 20.91
18 29.784 4.80 1.54814 45.8 20.45
19 -119.234 2.00 20.87
20 99.170 3.22 1.78472 25.7 25.23
21 -62.702 1.30 1.76385 48.5 25.08
22 48.094 3.54 24.53
23 -80.964 1.30 1.76385 48.5 24.69
24 140.808 1.27 25.34
25 57.182 13.30 1.67300 38.1 24.00
26 -35.514 1.30 1.59522 67.7 25.49
27 74.378 17.60 26.08
28 112.883 7.02 1.65412 39.7 33.62
29 -43.326 1.70 1.89286 20.4 33.92
30 -99.977 84.94 34.71
Image plane ∞

Various data focal length 778.70
F-number 5.83
Half angle of view 1.59
Image height 21.64
Total lens length 485.28
BF 84.94

∞ -0.14 times
d12 88.70 58.25
d15 3.28 33.73

Entrance pupil position 834.02
Exit pupil position -132.06
Front principal point position -1181.64
Rear principal point position -693.76

Lens group data group Start surface Focal length Lens configuration length Front principal point position Rear principal point position
1 1 553.60 175.48 -202.95 -262.39
2 13 326.76 10.02 -1.93 -8.08
3 16 -148.91 122.87 30.61 -106.67

Single lens Data lens Start surface Focal length
1 1 351.50
2 3 218.15
3 5 -106.45
4 7 171.79
5 9 736.46
6 11 -208.62
7 13 150.05
8 14 -271.75
9 17 -36.34
10 18 43.98
11 20 49.38
12 21 -35.45
13 23 -67.13
14 25 34.55
15 26 -40.21
16 28 48.73
17 29 -86.87

  Next, an embodiment of a digital still camera (imaging apparatus) using the optical system of the present invention as an imaging optical system will be described with reference to FIG. In FIG. 29, reference numeral 10 denotes a camera main body, and 11 denotes a photographing optical system constituted by any of the optical systems described in the first to fourteenth embodiments. Reference numeral 12 denotes a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor that receives a subject image formed by the imaging optical system 11 and is built in the camera body.

  As described above, by applying the optical system of the present invention to an imaging device such as a digital still camera, it is possible to obtain an imaging device that is lightweight and in which aberrations such as chromatic aberration are well corrected.

B1 First lens group B2 Second lens group B3 Third lens group SP Aperture stop

Claims (12)

The first lens group , the second lens group , and the third lens group having a positive refractive power are arranged in order from the object side to the image side, and the second lens group moves during focusing, and the adjacent lens group moves. An optical system with a variable spacing,
The first lens group includes a positive lens G1p disposed closest to the object side, a positive lens G2p disposed closer to the image side than the positive lens G1p, and a positive lens disposed closer to the image side than the positive lens G2p. G3p, and at least one negative lens;
The focal length of the optical system is f, the distance on the optical axis from the most object side lens surface of the first lens group to the image plane is LD, and the positive lens G1p and the image side of the positive lens G1p are adjacent to each other. The distance on the optical axis from the disposed lens is D12, the Abbe number of the material of the positive lens G2p is νdG2p, the Abbe number of the material of the positive lens G3p is νdG3p, and among the negative lenses included in the one lens group. When the Abbe number of the negative lens G1n arranged closest to the object side is νdG1n,
LD / f <1.0
0.170 <D12 / LD <0.500
νdG2p> 73.0
νdG3p> 73.0
20.0 <νdG1n <40.0
An optical system characterized by satisfying the following conditional expression. When the focal length of the positive lens G1p is fG1p and the focal length of the negative lens G1n is fG1n,
1.80 <| fG1p / fG1n | <10.00
The optical system according to claim 1, wherein the following conditional expression is satisfied. When the partial dispersion ratio of the material of the positive lens G2p is θgF_G2p,
0.020 <θgF_G2p− (0.6438−0.001682 × νdG2p) <0.100
The optical system according to claim 1, wherein the following conditional expression is satisfied. When the partial dispersion ratio of the material of the positive lens G3p is θgF_G3p,
0.020 <θgF_G3p− (0.6438−0.001682 × νdG3p) <0.100
The optical system according to any one of claims 1 to 3, wherein the following conditional expression is satisfied. When the distance on the optical axis from the object-side lens surface of the positive lens G2p to the image plane is LG2p,
LG2p / (LD-D12)> 0.80
The optical system according to any one of claims 1 to 4, wherein the following conditional expression is satisfied. When the distance on the optical axis from the lens surface on the object side of the positive lens G3p to the image plane is LG3p,
LG3p / (LD-D12)> 0.70
The optical system according to any one of claims 1 to 5, wherein the following conditional expression is satisfied. When the specific gravity of the material of the positive lens G1p is ρG1p,
ρG1p <3.0 [g / cm ³ ]
The optical system according to any one of claims 1 to 6, wherein the following conditional expression is satisfied.   The optical system according to any one of claims 1 to 7, wherein the second lens group includes a positive lens and a negative lens.   The optical system according to claim 1, wherein the second lens group includes two or less lenses. When the focal length of the positive lens G1p is fG1p and the focal length of the positive lens G2p is fG2p,
1.50 <fG1p / fG2p <5.00
The optical system according to any one of claims 1 to 9, wherein the following conditional expression is satisfied. When the focal length of the positive lens G1p is fG1p and the focal length of the positive lens G3p is fG3p,
1.30 <fG1p / fG3p <5.00
The optical system according to claim 1, wherein the following conditional expression is satisfied.   An imaging apparatus comprising: the optical system according to claim 1; and an imaging element that receives an image formed by the optical system.

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