JP2017003807A - Wide-angle lens, image capturing optical device, and digital equipment - Google Patents

Wide-angle lens, image capturing optical device, and digital equipment Download PDF

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JP2017003807A
JP2017003807A JP2015118274A JP2015118274A JP2017003807A JP 2017003807 A JP2017003807 A JP 2017003807A JP 2015118274 A JP2015118274 A JP 2015118274A JP 2015118274 A JP2015118274 A JP 2015118274A JP 2017003807 A JP2017003807 A JP 2017003807A
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lens
wide
image
angle
conditional expression
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JP6512955B2 (en
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泰成 福田
Yasunari Fukuda
泰成 福田
佳奈 井上
Kana Inoue
佳奈 井上
明子 古田
Akiko Furuta
明子 古田
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コニカミノルタ株式会社
Konica Minolta Inc
株式会社ニコン
Nikon Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a wide-angle lens which has a wide view angle represented by an imaging view angle 2ω in excess of 70 degrees and a bright F-number, and yet offers reduced distortion aberration and uniform image quality over an entire image, and to provide an image capturing optical device and digital equipment having the same.SOLUTION: A wide-angle lens LN comprises a first group Gr1 and a positive second group Gr2 in order from the object side, the first group Gr1 comprising, in order from the object side, first through fifth lenses L1-L5 having negative, negative, positive, negative, and positive power, respectively. The third and fourth lenses L3, L4 constitutes a cemented lens LS. The wide-angle lens focuses on an object at a close distance by moving the second group Gr2 toward the object side while keeping the first group Gr1 stationary, and is configured to satisfy a conditional expression: -0.2<φ1/φ<0.1, 0.45<φ2/φ, where φ1 and φ2 represent power of the first group and the second group, respectively, and φ represents power of the entire system.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wide-angle lens, an imaging optical device, and a digital device. More specifically, the present invention relates to an image of an object as an imaging device (for example, a CCD (Charge Coupled Device) type image sensor, a CMOS (Complementary Metal-Oxide Semiconductor) type image. A compact and large-diameter wide-angle lens suitable for interchangeable lens digital cameras captured by a solid-state image sensor such as a sensor, and an imaging optical device that outputs an image of a subject captured by the wide-angle lens and the image sensor as an electrical signal; The present invention relates to a digital device with an image input function such as a digital camera equipped with the imaging optical device.

  In recent years, digital cameras have become common as interchangeable lens cameras. In digital cameras, it is possible for a user to view a photographed image at the same magnification on a monitor. Therefore, improvement in MTF (Modulation Transfer Function) performance and reduction in chromatic aberration are increasingly required. In addition, there is a need for an interchangeable lens having a large aperture of F value: 2 or less and a wide angle of field of view 2ω: 70 degrees or more. In order to meet these requirements, Patent Documents 1 and 2 propose wide-angle lenses as interchangeable lenses for interchangeable lens digital cameras.

JP 05-034592 A Japanese Patent Laid-Open No. 11-211978

  The wide-angle lens proposed in Patent Document 1 realizes a wide angle of view, while distortion aberration and the like are insufficiently corrected, and the F value is about 2.8. The wide-angle lens proposed in Patent Document 2 achieves a bright F value of about 1.4, but the shooting angle of view 2ω is as narrow as about 65 degrees.

  The present invention has been made in view of such a situation, and an object of the present invention is to suppress distortion aberration while realizing a wide field angle exceeding 70 degrees and a bright F value, and to uniform the entire image. Another object of the present invention is to provide a small wide-angle lens that can obtain a high image quality, an imaging optical device including the same, and a digital device.

In order to achieve the above object, the wide-angle lens of the first invention comprises, in order from the object side, a first group and a second group having positive power.
The first group includes, in order from the object side, a first lens having negative power, a second lens having negative power, a third lens having positive power, a fourth lens having negative power, and positive power. And a fifth lens having
The third lens and the fourth lens constitute a cemented lens,
Focusing on a short-distance object is performed by moving the second group to the object side with the position of the first group fixed.
The following conditional expressions (1) and (2) are satisfied.
-0.2 <φ1 / φ <0.1 (1)
0.45 <φ2 / φ (2)
However,
φ1: Power of the first group,
φ2: Power of the second group,
φ: Power of the entire system,
It is.

The wide-angle lens of the second invention is characterized in that, in the first invention, the following conditional expression (3) is satisfied.
0.5 <t / f <0.9 (3)
However,
t: the distance between the second lens and the third lens,
f: focal length of the entire system,
It is.

A wide-angle lens according to a third aspect of the invention is characterized in that, in the first or second aspect of the invention, the following conditional expression (4) is satisfied.
-1 <f1a / f1b <-0.1 (4)
However, when the first group is divided into two lens groups with the widest lens interval in the first group as a boundary, the lens group on the object side is the front group and the lens group on the image side is the rear group. ,
f1a: focal length of the front group,
f1b: focal length of rear group,
It is.

The wide-angle lens according to a fourth aspect of the invention is characterized in that, in any one of the first to third aspects of the invention, the following conditional expression (5) is satisfied.
1 <f1s / f <5 (5)
However,
f1s: focal length of the cemented lens composed of the third lens and the fourth lens,
f: focal length of the entire system,
It is.

The wide-angle lens according to a fifth aspect of the invention is characterized in that, in any one of the first to fourth aspects of the invention, the following conditional expression (6) is satisfied.
−3 <r1s / f <−0.9 (6)
However,
r1s: radius of curvature of the cemented surface of the cemented lens composed of the third lens and the fourth lens,
f: focal length of the entire system,
It is.

A wide-angle lens according to a sixth aspect of the invention is characterized in that, in any one of the first to fifth aspects, the following conditional expression (7) is satisfied.
1.72 <Ndmax (7)
However,
Ndmax: highest refractive index based on d-line in the cemented lens composed of the third lens and the fourth lens,
It is.

  A wide-angle lens according to a seventh invention is characterized in that, in any one of the first to sixth inventions, at least one negative lens in the first group has an aspherical surface.

  A wide-angle lens according to an eighth invention is characterized in that, in any one of the first to seventh inventions, an aperture stop is provided in the second group, and the lens is positioned before and after the aperture stop. .

A wide-angle lens according to a ninth invention is characterized in that, in any one of the first to eighth inventions, at least one positive lens satisfying the following conditional expression (8) is provided on the image side from the aperture stop. To do.
60 <νd (8)
However,
νd: Abbe number,
It is.

  A wide-angle lens according to a tenth aspect of the invention is characterized in that, in any one of the first to ninth aspects, at least one cemented lens is included on the image side from the aperture stop.

  A wide-angle lens according to an eleventh aspect of the invention is any one of the first to tenth aspects of the invention, further comprising an aperture stop in the second group, and at least one aspheric surface on the image side from the aperture stop. It is characterized by.

  An imaging optical device according to a twelfth aspect includes the wide-angle lens according to any one of the first to eleventh aspects, and an imaging element that converts an optical image formed on the imaging surface into an electrical signal. And the wide-angle lens is provided so that an optical image of a subject is formed on the imaging surface of the imaging device.

  According to a thirteenth aspect of the present invention, a digital apparatus includes the imaging optical device according to the twelfth aspect of the present invention, to which at least one function of still image shooting and moving image shooting of a subject is added.

  According to the present invention, a small wide-angle lens and an imaging optical device that can achieve a wide field angle exceeding 70 degrees and a bright F value while suppressing distortion while achieving uniform image quality over the entire image are realized. can do. By using the wide-angle lens or the imaging optical device for a digital device (for example, a digital camera), a high-performance image input function can be added to the digital device in a compact manner.

The lens block diagram of 1st Embodiment (Example 1). The lens block diagram of 2nd Embodiment (Example 2). The lens block diagram of 3rd Embodiment (Example 3). The lens block diagram of 4th Embodiment (Example 4). The lens block diagram of 5th Embodiment (Example 5). The lens block diagram of 6th Embodiment (Example 6). FIG. 3 is a longitudinal aberration diagram of Example 1. FIG. 6 is a longitudinal aberration diagram of Example 2. FIG. 6 is a longitudinal aberration diagram of Example 3. FIG. 6 is a longitudinal aberration diagram of Example 4. FIG. 6 is a longitudinal aberration diagram of Example 5. FIG. 6 is a longitudinal aberration diagram of Example 6. FIG. 4 is a lateral aberration diagram of Example 1. FIG. 4 is a lateral aberration diagram of Example 2. FIG. 4 is a lateral aberration diagram of Example 3. FIG. 6 is a lateral aberration diagram of Example 4. FIG. 6 is a lateral aberration diagram of Example 5. FIG. 12 is a lateral aberration diagram of Example 6. The graph which shows the specific example of an aspherical shape. FIG. 3 is a schematic diagram illustrating a schematic configuration example of a digital device including an imaging optical device.

Hereinafter, a wide-angle lens, an imaging optical device, and a digital device according to embodiments of the present invention will be described. A wide-angle lens according to an embodiment of the present invention includes, in order from the object side, a first group and a second group having positive power (power: an amount defined by the reciprocal of the focal length), and the first group. Are, in order from the object side, a first lens having negative power, a second lens having negative power, a third lens having positive power, a fourth lens having negative power, and a fifth lens having positive power. The third lens and the fourth lens constitute a cemented lens, and the second group is moved to the object side in a state where the position of the first group is fixed. The following conditional expressions (1) and (2) are satisfied.
-0.2 <φ1 / φ <0.1 (1)
0.45 <φ2 / φ (2)
However,
φ1: Power of the first group,
φ2: Power of the second group,
φ: Power of the entire system,
It is.

  As described above, the first group is composed of five lenses having negative, negative, positive, and positive powers in order from the object side. Of these, a cemented lens is composed of a positive third lens and a negative fourth lens. Is configured. By arranging the lenses in the first group in negative and positive and negative power arrangements in order from the object side, it is possible to reduce the distortion while reducing the front lens diameter even at a wide angle, and as the final lens of the first group By arranging the positive lens, it is possible to reduce the diameter of the second group. Further, by constructing a positive and negative cemented lens with the third and fourth lenses, it is possible to reduce lateral chromatic aberration. A resin layer having a thickness on the optical axis of 1 mm or less does not constitute the cemented lens. Therefore, a lens (for example, a composite aspherical lens) in which a resin is formed on the lens surface with a core thickness of 1 mm or less as a material for forming the lens is considered as one lens.

The conditional expression (1) prescribes the power of the first group relative to the power of the entire system. However, if the upper limit of the conditional expression (1) is not reached, the lens is longer than the focal length of the entire system. Back can be secured. The long lens back referred to here satisfies the following conditional expression (0). Further, if the upper limit of conditional expression (1) is not reached, the axial light beam emitted from the first group becomes substantially parallel light, so that aberration fluctuations during focusing can be reduced. In particular, fluctuations in spherical aberration can be reduced.
BF / f> 1.4 (0)
However,
BF: Back focus,
f: focal length of the entire system,
It is.

  On the other hand, exceeding the lower limit of conditional expression (1) prevents the negative power of the first group from becoming too strong, thereby reducing the occurrence of various aberrations including spherical aberration. In particular, the occurrence of distortion can be reduced. Further, if the lower limit of conditional expression (1) is exceeded, the axial light beam emitted from the first group becomes substantially parallel light, so that aberration fluctuations during focusing can be reduced. In particular, fluctuations in spherical aberration can be reduced.

  The conditional expression (2) regulates the optimal power of the second group following the first group, but the power of the second group is weakened by exceeding the lower limit of the conditional expression (2). The amount of movement at the time of focusing can be reduced so as not to become too much. As a result, downsizing of the lens system can be achieved. From the above, it is possible to achieve uniform image quality and downsizing from the center of the screen to the periphery of the screen with a small distortion while having a wide angle of view.

  In other words, according to the above characteristic configuration, a small wide-angle lens capable of suppressing the distortion aberration while realizing a wide field angle exceeding 70 degrees and a bright F value and obtaining uniform image quality over the entire image, and the same are provided. An imaging optical device can be realized. By using the wide-angle lens or the imaging optical device for a digital device (for example, a digital camera), it is possible to add a high-performance image input function to the digital device in a lightweight and compact manner. It can contribute to cost, high performance and high functionality. For example, since the wide-angle lens according to the present invention is suitable as an interchangeable lens for a digital camera or a video camera, a lightweight and small interchangeable lens that is convenient to carry can be realized. In the following, conditions for obtaining such effects in a well-balanced manner and achieving higher optical performance, light weight, downsizing, and the like will be described.

It is more desirable to satisfy the following conditional expression (1a).
-0.1 <φ1 / φ <0.1 (1a)
The conditional expression (1a) defines a more preferable condition range based on the above viewpoints, etc., among the condition ranges defined by the conditional expression (1). Therefore, the above effect can be further enhanced preferably by satisfying conditional expression (1a).

It is more desirable to satisfy the following conditional expression (2a).
0.5 <φ2 / φ <0.7 (2a)
This conditional expression (2a) defines a more preferable condition range based on the above viewpoints, etc., among the condition ranges defined by the conditional expression (2). Therefore, the above effect can be further increased preferably by satisfying conditional expression (2a). That is, when the lower limit of conditional expression (2a) is exceeded, the amount of movement during focusing can be further reduced, and downsizing becomes possible. Further, when the value falls below the upper limit of conditional expression (2a), the power of the second group is prevented from becoming too strong, the decentering sensitivity of the focus group is reduced, and aberration fluctuations during focusing (variations such as field curvature) It is possible to prevent the performance deterioration due to.

It is desirable to satisfy the following conditional expression (3).
0.5 <t / f <0.9 (3)
However,
t: the distance between the second lens and the third lens,
f: focal length of the entire system,
It is.

  By falling below the upper limit of conditional expression (3), distortion and coma can be effectively corrected, the diameters of the first lens and the second lens can be suppressed, and the lens system can be downsized. It becomes. On the other hand, by exceeding the lower limit of the conditional expression (3), the principal point positions of the second lens having the negative power and the third lens having the positive power can be separated, and the power of each lens can be reduced. Occurrence can be reduced.

It is desirable to satisfy the following conditional expression (4).
-1 <f1a / f1b <-0.1 (4)
However, when the first group is divided into two lens groups with the widest lens interval in the first group as a boundary, the lens group on the object side is the front group and the lens group on the image side is the rear group. ,
f1a: focal length of the front group,
f1b: focal length of rear group,
It is.

  Conditional expression (4) prescribes an appropriate power arrangement within the first group. However, if the upper limit of conditional expression (4) is not reached, distortion occurring in the front group is effective in the rear group. It becomes possible to correct to. On the other hand, exceeding the lower limit of conditional expression (4) makes it possible to reduce spherical aberration, distortion, and the like.

It is desirable to satisfy the following conditional expression (5).
1 <f1s / f <5 (5)
However,
f1s: focal length of the cemented lens composed of the third lens and the fourth lens,
f: focal length of the entire system,
It is.

  If the upper limit of conditional expression (5) is not reached, insufficient correction of the g-line with respect to the d-line can be prevented to reduce lateral chromatic aberration, and the coma aberration of the upper marginal ray can be effectively corrected. On the other hand, when the lower limit of conditional expression (5) is surpassed, it becomes easy to secure the back focus, and further, overcorrection of the g-line with respect to the d-line is prevented to prevent the lateral chromatic aberration from deteriorating. It becomes possible to prevent the coma from deteriorating.

It is desirable to satisfy the following conditional expression (6).
−3 <r1s / f <−0.9 (6)
However,
r1s: radius of curvature of the cemented surface of the cemented lens composed of the third lens and the fourth lens,
f: focal length of the entire system,
It is.

  By falling below the upper limit of conditional expression (6), it is possible to prevent the coma aberration of the lower marginal ray from deteriorating. On the other hand, by exceeding the lower limit of conditional expression (6), the coma aberration of the upper marginal ray can be effectively corrected.

It is desirable to satisfy the following conditional expression (7).
1.72 <Ndmax (7)
However,
Ndmax: highest refractive index based on d-line in the cemented lens composed of the third lens and the fourth lens,
It is.

  By exceeding the lower limit of the conditional expression (7), it is possible to loosen the curvature of the lens, and thus it is possible to effectively reduce the occurrence of spherical aberration. Further, it is more desirable that the third lens and the fourth lens constituting the cemented lens satisfy the conditional expression (7).

It is more desirable to satisfy the following conditional expression (7a).
1.85 <Ndmax (7a)
This conditional expression (7a) defines a more preferable condition range based on the above viewpoints, etc., among the condition ranges defined by the conditional expression (7). Therefore, the above effect can be further increased preferably by satisfying conditional expression (7a). That is, when the conditional expression (7a) is satisfied, the generation of spherical aberration can be further effectively reduced.

  It is desirable that at least one negative lens in the first group has an aspherical surface. By disposing a negative lens in the first group, it is possible to widen the angle, but on the other hand, a large distortion aberration may occur, which may cause a problem. Therefore, if an aspherical surface is provided on the negative lens in the first lens group, it is possible to effectively correct distortion occurring in the negative lens. In order to effectively correct distortion, it is desirable that the aspherical surface has a shape in which the power decreases with increasing distance from the center of the optical axis with respect to the shape represented by the paraxial radius of curvature. An example is shown in FIG. A dotted line R0 indicates the shape of a reference spherical surface having a paraxial radius of curvature (corresponding to a radius of curvature r in an embodiment described later), and a solid line R * indicates the actual shape of an aspheric surface including an aspheric coefficient. ing.

  It is desirable to have an aperture stop in the second group, and the lens is positioned before and after the aperture stop. If comprised in this way, the optical effective diameter of the 2nd group which is a focus group can be reduced, and size reduction is attained. This also makes it possible to reduce the noise and increase the speed during focusing.

It is desirable to have at least one positive lens that satisfies the following conditional expression (8) on the image side from the aperture stop.
60 <νd (8)
However,
νd: Abbe number,
It is.

  Exceeding the lower limit of conditional expression (8) can effectively prevent excessive generation of chromatic aberration. It is further desirable to have two or more positive lenses that satisfy the conditional expression (8) on the image side from the aperture stop. Thereby, the occurrence of chromatic aberration can be further effectively reduced.

It is more desirable to satisfy the following conditional expression (8a).
70 <νd (8a)
This conditional expression (8a) defines a more preferable condition range based on the above viewpoints, etc., among the condition ranges defined by the conditional expression (8). Therefore, the above effect can be further increased preferably by satisfying conditional expression (8a). That is, by satisfying conditional expression (8a), the occurrence of chromatic aberration can be more effectively reduced.

  It is desirable to include at least one cemented lens closer to the image side than the aperture stop. If comprised in this way, generation | occurrence | production of a chromatic aberration can be reduced. It is further desirable to include at least two cemented lenses on the image side from the aperture stop. Thereby, the occurrence of chromatic aberration can be further effectively reduced.

  It is desirable to have an aperture stop in the second group and to have at least one aspheric surface on the image side from the aperture stop. If comprised in this way, it will become possible to correct | amend effectively the spherical aberration and the coma aberration which arose on the object side from the aperture stop by the aspherical surface. In order to effectively correct spherical aberration and coma aberration, it is desirable that the aspherical surface has a shape in which the power increases with increasing distance from the optical axis center with respect to the shape represented by the paraxial radius of curvature. An example is shown in FIG. A dotted line R0 indicates the shape of a reference spherical surface having a paraxial radius of curvature (corresponding to a radius of curvature r in an embodiment described later), and a solid line R * indicates the actual shape of an aspheric surface including an aspheric coefficient. ing.

  The wide-angle lens according to the embodiment of the present invention is suitable for use as an imaging lens for a digital device with an image input function (for example, an interchangeable lens digital camera). An imaging optical device that optically captures an image and outputs it as an electrical signal can be configured. The imaging optical device is an optical device that constitutes a main component of a camera used for still image shooting or moving image shooting of a subject, for example, a wide-angle lens that forms an optical image of an object in order from the object (i.e., subject) side, And an imaging device that converts an optical image formed by the wide-angle lens into an electrical signal. Further, the wide-angle lens having the above-described characteristic configuration is arranged so that an optical image of the subject is formed on the light receiving surface (that is, the imaging surface) of the imaging device. An imaging optical device and a digital device including the imaging optical device can be realized.

  Examples of digital devices with an image input function include cameras such as digital cameras, video cameras, surveillance cameras, security cameras, in-vehicle cameras, and videophone cameras. In addition, personal computers, portable digital devices (for example, mobile phones, smart phones (high performance mobile phones), tablet terminals, mobile computers, etc.), peripheral devices (scanners, printers, mice, etc.), and other digital devices (drives) Recorders, defense equipment, etc.) with built-in or external camera functions. As can be seen from these examples, it is possible not only to configure a camera by using an imaging optical device, but also to add a camera function by mounting the imaging optical device on various devices. For example, a digital device with an image input function such as a mobile phone with a camera can be configured.

  FIG. 20 is a schematic cross-sectional view showing a schematic configuration example of a digital device DU as an example of a digital device with an image input function. The imaging optical device LU mounted on the digital device DU shown in FIG. 20 includes, in order from the object (namely, subject) side, a wide-angle lens LN (AX: optical axis) that forms an optical image (image plane) IM of the object, An image sensor SR that converts the optical image IM formed on the light receiving surface (imaging surface) SS by the wide-angle lens LN into an electrical signal, and a parallel plane plate (for example, the image sensor SR) as necessary. (Corresponding to an optical filter such as an optical low-pass filter and an infrared cut filter, which are arranged as necessary). When a digital device DU with an image input function is constituted by this imaging optical device LU, the imaging optical device LU is usually arranged inside the body, but when necessary to realize the camera function, a form as necessary is adopted. Is possible. For example, the unitized imaging optical device LU can be configured to be detachable or rotatable with respect to the main body of the digital device DU.

  The wide-angle lens LN is a wide-angle lens having a two-group configuration, and moves the second group of positive power to the object side along the optical axis AX while fixing the position of the first group, thereby reducing the distance to an object at a short distance. The optical image IM is formed on the light receiving surface SS of the image sensor SR by performing focusing. As the image sensor SR, for example, a solid-state image sensor such as a CCD image sensor or a CMOS image sensor having a plurality of pixels is used. Since the wide-angle lens LN is provided so that the optical image IM of the subject is formed on the light-receiving surface SS that is a photoelectric conversion unit of the image sensor SR, the optical image IM formed by the wide-angle lens LN is the image sensor It is converted into an electric signal by SR.

  The digital device DU includes a signal processing unit 1, a control unit 2, a memory 3, an operation unit 4, a display unit 5 and the like in addition to the imaging optical device LU. The signal generated by the image sensor SR is subjected to predetermined digital image processing, image compression processing, and the like in the signal processing unit 1 as necessary, and recorded as a digital video signal in the memory 3 (semiconductor memory, optical disc, etc.) In some cases, it is transmitted to other devices via a cable or converted into an infrared signal or the like (for example, a communication function of a mobile phone). The control unit 2 is composed of a microcomputer, and controls functions such as shooting functions (still image shooting function, movie shooting function, etc.) and image playback functions; focusing, lens movement mechanism control for camera shake correction, etc. Do it. For example, the control unit 2 controls the imaging optical device LU so as to perform at least one of still image shooting and moving image shooting of a subject. The display unit 5 includes a display such as a liquid crystal monitor, and performs image display using an image signal converted by the image sensor SR or image information recorded in the memory 3. The operation unit 4 is a part including operation members such as an operation button (for example, a release button) and an operation dial (for example, a shooting mode dial), and transmits information input by the operator to the control unit 2.

  Next, specific optical configurations of the wide-angle lens LN will be described in more detail with reference to first to sixth embodiments. 1 to 6 are lens configuration diagrams corresponding to the wide-angle lenses LN constituting the first to sixth embodiments, respectively, and the lens arrangement at the first focus position POS1 (subject infinite state) is an optical cross section. Is shown. The first embodiment has a positive two-group configuration, and the second to sixth embodiments have a negative-positive two-group configuration. During focusing, the first group Gr1 is fixed in position. The second group Gr2 moves toward the object side along the optical axis AX. That is, the second group Gr2, which is the focus group, moves from the first focus position POS1 to the second focus position POS2 (subject close-up state) in focusing from infinity to a short distance, as indicated by an arrow mF. To do.

  The first group Gr1 includes, in order from the object side, a first lens L1 having negative power, a second lens L2 having negative power, a third lens L3 having positive power, and a fourth lens L4 having negative power. , And a fifth lens L5 having positive power (power arrangement of the first to fifth lenses L1 to L5: negative, negative, positive, positive), and the first lens group Gr1 having the widest lens interval as a boundary. When the first group Gr1 is divided into two lens groups, the lens group on the object side is the front group Gr1a, and the lens group on the image side is the rear group Gr1b. In the first to sixth embodiments, the front group Gr1a has negative power, the rear group Gr1b has positive power, and the power arrangement between the front group Gr1a and the rear group Gr1b is appropriately set. By setting, it is possible to correct aberrations satisfactorily.

  In the wide-angle lens LN (FIG. 1) of the first embodiment, each group is configured as follows in order from the object side. Of the first group Gr1, the front group Gr1a includes a negative meniscus lens L1 that is concave on the image side and a negative meniscus lens L2 that is concave on the image side (the image side is aspheric), and the rear group Gr1b is biconvex. This is composed of a cemented lens LS comprising a positive lens L3 and a negative biconcave lens L4, and a positive meniscus lens L5 convex on the object side. The second group Gr2 includes a biconvex positive lens, a negative meniscus lens concave on the image side, an aperture stop ST, a cemented lens made up of a biconcave negative lens and a biconvex positive lens, and a concave lens on the image side. It is composed of a cemented lens composed of a negative meniscus lens and a biconvex positive lens, and a positive meniscus lens convex on the image side (the object side surface is aspheric).

  In the wide-angle lens LN (FIG. 2) of the second embodiment, each group is configured as follows in order from the object side. Of the first group Gr1, the front group Gr1a includes a negative meniscus lens L1 that is concave on the image side and a negative meniscus lens L2 that is concave on the image side (the image side is aspheric), and the rear group Gr1b is biconvex. This is composed of a cemented lens LS comprising a positive lens L3 and a negative biconcave lens L4, and a positive meniscus lens L5 convex on the object side. The second group Gr2 includes a biconvex positive lens, a biconcave negative lens, an aperture stop ST, a cemented lens composed of a biconcave negative lens and a biconvex positive lens, and a negative meniscus lens concave on the image side. And a cemented lens composed of a biconvex positive lens, and a positive meniscus lens convex on the image side (the object side surface is aspheric).

  In the wide-angle lens LN (FIG. 3) of the third embodiment, each group is configured as follows in order from the object side. Of the first group Gr1, the front group Gr1a includes a negative meniscus lens L1 that is concave on the image side and a negative meniscus lens L2 that is concave on the image side (the image side is aspheric), and the rear group Gr1b is biconvex. The positive lens L3, a cemented lens LS composed of a negative meniscus lens L4 concave on the object side, and a positive meniscus lens L5 convex on the object side. The second group Gr2 includes a biconvex positive lens, a negative meniscus lens concave on the image side, an aperture stop ST, a cemented lens made up of a biconcave negative lens and a biconvex positive lens, and a concave lens on the image side. It is composed of a cemented lens composed of a negative meniscus lens and a biconvex positive lens, and a positive meniscus lens convex on the image side (the object side surface is aspheric).

  In the wide-angle lens LN (FIG. 4) of the fourth embodiment, each group is configured as follows in order from the object side. Of the first group Gr1, the front group Gr1a includes a negative meniscus lens L1 that is concave on the image side and a negative meniscus lens L2 that is concave on the image side (the image side is aspheric), and the rear group Gr1b is biconvex. This is composed of a cemented lens LS comprising a positive lens L3 and a negative biconcave lens L4, and a positive meniscus lens L5 convex on the object side. The second group Gr2 includes a biconvex positive lens, a negative meniscus lens concave on the image side, an aperture stop ST, a cemented lens made up of a biconcave negative lens and a biconvex positive lens, and a concave lens on the image side. It is composed of a cemented lens composed of a negative meniscus lens and a biconvex positive lens, and a positive meniscus lens convex on the image side (the object side surface is aspheric).

  In the wide-angle lens LN (FIG. 5) of the fifth embodiment, each group is configured as follows in order from the object side. Of the first group Gr1, the front group Gr1a includes a negative meniscus lens L1 that is concave on the image side and a negative meniscus lens L2 that is concave on the image side (the image side is aspheric), and the rear group Gr1b is biconvex. This is composed of a cemented lens LS comprising a positive lens L3 and a negative biconcave lens L4, and a positive meniscus lens L5 convex on the object side. The second group Gr2 includes a biconvex positive lens, a biconcave negative lens, an aperture stop ST, a cemented lens composed of a biconcave negative lens and a biconvex positive lens, and a negative meniscus lens concave on the image side. And a cemented lens composed of a biconvex positive lens, and a positive meniscus lens convex on the image side (the object side surface is aspheric).

  In the wide-angle lens LN (FIG. 6) of the sixth embodiment, each group is configured as follows in order from the object side. Of the first group Gr1, the front group Gr1a includes a negative meniscus lens L1 that is concave on the image side and a negative meniscus lens L2 that is concave on the image side (the image side is aspheric), and the rear group Gr1b is biconvex. This is composed of a cemented lens LS comprising a positive lens L3 and a negative biconcave lens L4, and a positive meniscus lens L5 convex on the object side. The second group Gr2 includes a biconvex positive lens, a cemented lens including a positive meniscus lens convex to the image side and a biconcave negative lens, an aperture stop ST, a negative meniscus lens concave on the object side, and an image side. A cemented lens including a negative negative meniscus lens and a biconvex positive lens, and a positive meniscus lens convex on the image side (the object side surface is aspheric).

  Hereinafter, the configuration and the like of the wide-angle lens embodying the present invention will be described more specifically with reference to the construction data of the examples. Examples 1 to 6 (EX1 to 6) listed here are numerical examples corresponding to the first to sixth embodiments, respectively, and are lens configuration diagrams illustrating the first to sixth embodiments. (FIGS. 1 to 6) show optical configurations of corresponding Examples 1 to 6, respectively.

  In the construction data of each embodiment, as surface data, in order from the left column, surface number i (OB: object surface, ST: aperture surface, IM: image surface), radius of curvature r (mm) in paraxial, axial upper surface The distance d (mm), the refractive index Nd for the d line (wavelength: 587.56 nm), and the Abbe number νd for the d line are shown. Note that the variable shaft upper surface distance di (i: surface number, mm) that changes due to focusing is shown for each of the first focus position POS1 to the second focus position POS2.

The surface with * in the surface number i is an aspheric surface, and the surface shape is defined by the following formula (AS) using a local orthogonal coordinate system (x, y, z) with the surface vertex as the origin. The As aspheric data, an aspheric coefficient or the like is shown. It should be noted that the coefficient of the term not described in the aspherical data of each example is 0, and E−n = × 10 −n for all data.
z = (c · h 2 ) / [1 + √ {1− (1 + K) · c 2 · h 2 }] + Σ (Aj · h j ) (AS)
However,
h: height in the direction perpendicular to the z axis (optical axis AX) (h 2 = x 2 + y 2 ),
z: the amount of sag in the direction of the optical axis AX at the position of the height h (based on the surface vertex),
c: curvature at the surface vertex (the reciprocal of the radius of curvature r),
K: conic constant,
Aj: j-order aspheric coefficient,
It is.

  As various data, the focal length f (mm), F number (F value) FNO. , Full field angle 2ω (°), maximum image height y′max (mm), total lens length TL (mm), back focus BF (mm), focal length f1 (mm) of the first group Gr1, and second group Gr2. The focal length f2 (mm), the focal length f1a (mm) of the front group Gr1a, the focal length f1b (mm) of the rear group Gr1b, and the focal length f1s (mm) of the cemented lens LS are shown. However, in the back focus BF, the distance from the lens final surface to the paraxial image surface is expressed in terms of air length, and the total lens length TL is obtained by adding the back focus BF to the distance from the lens front surface to the lens final surface. Is. Table 1 shows values corresponding to the conditional expressions of the respective examples.

  7 to 12 are longitudinal aberration diagrams corresponding to Examples 1 to 6 (EX1 to EX6), respectively, and (A) to (C) are the first focus positions POS1 and (D) to (F). Indicates various aberrations at the second focus position POS2. 7 to 12, (A) and (D) are spherical aberration diagrams, (B) and (E) are astigmatism diagrams, and (C) and (F) are distortion aberration diagrams.

  The spherical aberration diagram shows the amount of spherical aberration with respect to the C line (wavelength 656.28 nm) indicated by the alternate long and short dash line, the amount of spherical aberration with respect to the d line (wavelength 587.56 nm) indicated by the solid line, and the g line (wavelength 435.84 nm) indicated by the broken line. The amount of spherical aberration is represented by the amount of deviation (mm) in the optical axis AX direction from the paraxial image plane, and the vertical axis represents the F value. In the astigmatism diagram, the broken line M represents the meridional image plane with respect to the d-line, and the solid line S represents the sagittal image plane with respect to the d-line in terms of the deviation (mm) in the optical axis AX direction from the paraxial image plane. The axis represents the image height Y ′ (mm). In the distortion diagram, the horizontal axis represents the distortion (%) with respect to the d line, and the vertical axis represents the image height Y ′ (mm). Note that the image height Y ′ corresponds to the maximum image height y′max (half the diagonal length of the light receiving surface SS of the image sensor SR) on the image plane IM.

  FIGS. 13 to 18 are lateral aberration diagrams corresponding to Examples 1 to 6 (EX1 to EX6), respectively. In each of FIGS. 13 to 18, (A) to (C) are lateral aberrations (mm) at the first focus position POS1, and (D) to (F) are lateral aberrations (mm) at the second focus position POS2. The meridional coma aberration at each image height Y ′ is shown.

Example 1
Unit: mm
Surface data
ir (mm) d (mm) Nd νd
0 (OB) ∞ ∞ to 98.22
1 50.533 2.70 1.77250 49.6
2 22.501 9.00
3 34.529 1.65 1.61800 63.4
4 22.013 0.04 1.51380 53.0
5 * 18.167 18.71
6 71.001 9.67 1.90370 31.3
7 -26.316 1.50 1.76180 26.6
8 105.524 4.45
9 49.499 3.21 1.76 180 26.6
10 142.449 7.81 to 2.70
11 36.141 4.76 1.69680 55.5
12 -125.009 0.48
13 205.192 1.00 1.58910 61.3
14 29.097 4.93
15 (ST) ∞ 4.09
16 -24.250 1.00 1.75520 27.5
17 109.363 3.34 1.49700 81.6
18 -76.219 0.24
19 42.767 1.00 1.74330 49.2
20 20.438 7.44 1.59280 68.6
21 -48.111 1.69
22 * -740.547 0.10 1.51380 53.0
23 -198.331 4.49 1.61800 63.4
24 -36.041 38.48 to 43.59
25 (IM) ∞

Aspheric data 5th surface
K = -0.17556E + 01
A4 = 0.22772E-04
A6 = -0.36566E-07
A8 = 0.14683E-09
A10 = -0.71099E-12
A12 = 0.17927E-14
A14 = -0.20200E-17

Aspheric data 22nd surface
K = 0.00000E + 00
A4 = -0.15468E-04
A6 = 0.10540E-07
A8 = -0.61729E-10
A10 = 2.45175E-13

Various data
f = 24.50
FNO. = 1.86
2ω = 83.9
y'max = 21.6
TL = 131.78
BF = 38.48
f1 = 272.20
f2 = 48.13
f1a = -28.23
f1b = 49.72
f1s = 89.86

Example 2
Unit: mm
Surface data
ir (mm) d (mm) Nd νd
0 (OB) ∞ ∞ to 98.22
1 40.121 3.00 1.77250 49.6
2 22.485 9.60
3 62.830 2.58 1.61800 63.4
4 23.546 0.04 1.51380 53.0
5 * 19.595 20.00
6 72.929 8.79 1.90370 31.3
7 -26.316 1.50 1.76180 26.6
8 111.539 0.52
9 58.710 4.16 1.72820 28.3
10 194.625 7.73 to 2.61
11 34.167 5.26 1.69680 55.5
12 -120.990 0.75
13 -16180.045 1.01 1.51820 59.0
14 30.203 4.96
15 (ST) ∞ 4.20
16 -24.665 1.00 1.69890 30.1
17 77.469 3.87 1.49700 81.6
18 -62.033 0.20
19 34.994 1.00 1.72920 54.7
20 19.967 8.74 1.49700 81.6
21 -42.559 0.49
22 * -2235.520 0.17 1.51380 53.0
23 -170.911 3.76 1.618 63.4
24 -41.665 38.46 to 43.58
25 (IM) ∞

Aspheric data 5th surface
K = 0.00000E + 00
A4 = -0.11294E-04
A6 = -0.23155E-07
A8 = -0.86729E-10
A10 = 0.29792E-12
A12 = -0.10728E-14

Aspheric data 22nd surface
K = 0.00000E + 00
A4 = -0.13437E-04
A6 = 0.10233E-07
A8 = -0.55607E-10
A10 = 2.76529E-13
A12 = 0.00000E + 00

Various data
f = 24.50
FNO. = 1.86
2ω = 84.5
y'max = 21.6
TL = 131.78
BF = 38.46
f1 = -4987.11
f2 = 46.70
f1a = -26.98
f1b = 51.74
f1s = 89.79

Example 3
Unit: mm
Surface data
ir (mm) d (mm) Nd νd
0 (OB) ∞ ∞ to 98.17
1 44.716 2.00 1.77250 49.6
2 21.404 10.53
3 64.612 1.65 1.61800 63.4
4 25.081 0.13 1.51380 53.0
5 * 21.084 14.36
6 72.910 12.49 1.90370 31.3
7 -24.001 3.50 1.76180 26.6
8 -6420.215 0.15
9 52.947 2.50 1.68890 31.2
10 63.368 9.42 to 4.02
11 32.107 5.14 1.69680 55.5
12 -99.920 0.63
13 5489.790 1.13 1.51820 59.0
14 29.174 4.81
15 (ST) ∞ 4.25
16 -23.001 1.00 1.69890 30.1
17 104.594 3.54 1.49700 81.6
18 -57.522 0.20
19 39.423 1.00 1.72920 54.7
20 22.017 7.27 1.49700 81.6
21 -39.424 0.55
22 * -145.207 0.12 1.51380 53.0
23 -87.536 7.00 1.61800 63.4
24 -32.177 38.46-43.85
25 (IM) ∞

Aspheric data 5th surface
K = 0.00000E + 00
A4 = -0.10921E-04
A6 = -0.27215E-07
A8 = 0.67603E-11
A10 = -0.67389E-13
A12 = -0.17399E-15

Aspheric data 22nd surface
K = 0.00000E + 00
A4 = -0.16852E-04
A6 = 0.19411E-08
A8 = -0.17747E-10
A10 = 1.17038E-13

Various data
f = 24.58
FNO. = 1.86
2ω = 84.04
y'max = 21.6
TL = 131.84
BF = 38.46
f1 = -333.33
f2 = 45.33
f1a = -24.67
f1b = 49.29
f1s = 55.77

Example 4
Unit: mm
Surface data
ir (mm) d (mm) Nd νd
0 (OB) ∞ ∞ to 104.38
1 40.617 2.00 1.77250 49.6
2 20.279 10.82
3 61.020 1.65 1.61800 63.4
4 25.165 0.08 1.51380 53.0
5 * 20.881 14.52
6 68.315 10.04 1.90366 31.3
7 -23.529 1.50 1.76182 26.6
8 3223.071 0.15
9 52.776 2.50 1.68893 31.2
10 59.872 9.36 to 4.38
11 31.700 4.93 1.69680 55.5
12 -107.081 0.61
13 638.554 1.00 1.51823 59.0
14 28.631 4.88
15 (ST) ∞ 4.09
16 -21.838 1.00 1.69895 30.1
17 119.399 3.61 1.49700 81.6
18 -49.519 0.20
19 39.257 1.00 1.72916 54.7
20 21.717 7.09 1.49700 81.6
21 -43.658 0.52
22 * -126.060 0.12 1.51380 53.0
23 -78.726 4.24 1.61800 63.4
24 -29.306 38.46 to 43.44
25 (IM) ∞

Aspheric data 5th surface
K = 0.00000E + 00
A4 = -0.10527E-04
A6 = -0.36577E-07
A8 = 0.58633E-10
A10 = -0.28305E-12
A12 = 0.82210E-16

Aspheric data 22nd surface
K = 0.00000E + 00
A4 = -0.17739E-04
A6 = 0.29940E-08
A8 = -0.12218E-10
A10 = 1.11346E-13

Various data
f = 24.43
FNO. = 1.86
2ω = 84.4
y'max = 21.6
TL = 124.37
BF = 38.46
f1 = -333.33
f2 = 44.08
f1a = -24.78
f1b = 48.66
f1s = 53.70

Example 5
Unit: mm
Surface data
ir (mm) d (mm) Nd νd
0 (OB) ∞ ∞ to 99.60
1 39.237 3.00 1.77250 49.6
2 21.180 11.00
3 67.013 3.00 1.61800 63.4
4 25.217 0.04 1.51380 53.0
5 * 20.453 14.47
6 61.107 9.49 1.90370 31.3
7 -26.316 2.63 1.76 180 26.6
8 434.825 0.15
9 43.375 4.73 1.74080 27.8
10 42.123 8.53 to 3.06
11 32.880 5.09 1.69680 55.5
12 -78.579 0.73
13 -183.660 1.08 1.51820 59.0
14 30.959 4.62
15 (ST) ∞ 4.47
16 -20.798 1.05 1.69890 30.1
17 531.625 4.03 1.49700 81.6
18 -41.278 0.20
19 36.464 1.00 1.72920 54.7
20 21.660 8.27 1.49700 81.6
21 -36.120 0.18
22 * -356.605 0.10 1.51380 53.0
23 -157.796 3.85 1.61800 63.4
24 -40.540 38.68 to 44.15 0.0
25 (IM) ∞

Aspheric data 5th surface
K = 0.00000E + 00
A4 = -0.11945E-04
A6 = -0.31103E-07
A8 = -0.17324E-10
A10 = 0.27577E-13
A12 = -0.50109E-15

Aspheric data 22nd surface
K = 0.00000E + 00
A4 = -0.14568E-04
A6 = 0.85925E-08
A8 = -0.70050E-10
A10 = 2.52141E-13

Various data
f = 24.55
FNO. = 1.86
2ω = 84.34
y'max = 21.6
TL = 130.40
BF = 38.68
f1 = -148.31
f2 = 40.83
f1a = -25.88
f1b = 51.66
f1s = 54.91

Example 6
Unit: mm
Surface data
ir (mm) d (mm) Nd νd
0 (OB) ∞ ∞ to 75.62
1 39.444 2.00 1.77250 49.6
2 19.366 9.45
3 41.091 1.65 1.61800 63.4
4 21.779 0.08 1.51380 53.0
5 * 18.854 13.49
6 146.250 10.15 1.80 150 40.6
7 -19.275 1.10 1.68400 38.9
8 87.034 0.55
9 49.110 3.52 1.84670 23.8
10 487.349 9.62 to 2.86
11 33.786 5.60 1.69680 55.5
12 -61.296 0.15
13 -542.436 3.23 1.54990 64.8
14 -29.897 1.10 1.69890 30.1
15 33.134 2.37
16 (ST) ∞ 5.16
17 -18.464 3.27 1.60340 38.0
18 -37.930 0.20
19 39.960 1.00 1.72920 54.7
20 23.034 8.34 1.49700 81.6
21 -26.121 0.83
22 * -93.641 0.16 1.51380 53.0
23 -60.445 2.92 1.61800 63.4
24 -44.783 38.45 to 45.22
25 (IM) ∞

Aspheric data 5th surface
K = 0.00000E + 00
A4 = -0.13123E-04
A6 = -0.47824E-07
A8 = 0.30552E-10
A10 = -0.25868E-12
A12 = -0.42244E-15

Aspheric data 22nd surface
K = 0.00000E + 00
A4 = -0.18102E-04
A6 = -0.54700E-08
A8 = -0.30831E-10
A10 = 7.13337E-14

Various data
f = 24.16
FNO. = 1.86
2ω = 85.02
y'max = 21.6
TL = 124.37
BF = 38.45
f1 = -250.00
f2 = 44.52
f1a = -25.49
f1b = 53.25
f1s = 260.71

DU Digital equipment LU Imaging optical device LN Wide angle lens Gr1 First group Gr2 Second group Gr1a Front group Gr1b Rear group L1 to L5 First to fifth lenses LS Joint lens ST Aperture stop (aperture surface)
SR Image sensor SS Light-receiving surface (imaging surface)
IM image plane (optical image)
AX Optical axis 1 Signal processing unit 2 Control unit 3 Memory 4 Operation unit 5 Display unit

Claims (13)

  1. In order from the object side, the first group and a second group having positive power,
    The first group includes, in order from the object side, a first lens having negative power, a second lens having negative power, a third lens having positive power, a fourth lens having negative power, and positive power. And a fifth lens having
    The third lens and the fourth lens constitute a cemented lens,
    Focusing on a short-distance object is performed by moving the second group to the object side with the position of the first group fixed.
    A wide-angle lens satisfying the following conditional expressions (1) and (2):
    -0.2 <φ1 / φ <0.1 (1)
    0.45 <φ2 / φ (2)
    However,
    φ1: Power of the first group,
    φ2: Power of the second group,
    φ: Power of the entire system,
    It is.
  2. The wide-angle lens according to claim 1, wherein the following conditional expression (3) is satisfied:
    0.5 <t / f <0.9 (3)
    However,
    t: the distance between the second lens and the third lens,
    f: focal length of the entire system,
    It is.
  3. The wide-angle lens according to claim 1, wherein the following conditional expression (4) is satisfied:
    -1 <f1a / f1b <-0.1 (4)
    However, when the first group is divided into two lens groups with the widest lens interval in the first group as a boundary, the lens group on the object side is the front group and the lens group on the image side is the rear group. ,
    f1a: focal length of the front group,
    f1b: focal length of rear group,
    It is.
  4. The wide-angle lens according to claim 1, wherein the following conditional expression (5) is satisfied:
    1 <f1s / f <5 (5)
    However,
    f1s: focal length of the cemented lens composed of the third lens and the fourth lens,
    f: focal length of the entire system,
    It is.
  5. The wide-angle lens according to claim 1, wherein the following conditional expression (6) is satisfied:
    −3 <r1s / f <−0.9 (6)
    However,
    r1s: radius of curvature of the cemented surface of the cemented lens composed of the third lens and the fourth lens,
    f: focal length of the entire system,
    It is.
  6. The wide-angle lens according to claim 1, wherein the following conditional expression (7) is satisfied:
    1.72 <Ndmax (7)
    However,
    Ndmax: highest refractive index based on d-line in the cemented lens composed of the third lens and the fourth lens,
    It is.
  7.   The wide-angle lens according to claim 1, wherein at least one negative lens in the first group has an aspherical surface.
  8.   The wide-angle lens according to claim 1, wherein an aperture stop is provided in the second group, and the lens is positioned before and after the aperture stop.
  9. 9. The wide-angle lens according to claim 1, comprising at least one positive lens that satisfies the following conditional expression (8) on the image side from the aperture stop:
    60 <νd (8)
    However,
    νd: Abbe number,
    It is.
  10.   The wide-angle lens according to claim 1, comprising at least one cemented lens closer to the image side than the aperture stop.
  11.   11. The wide-angle lens according to claim 1, further comprising an aperture stop in the second group, and at least one aspheric surface on the image side from the aperture stop.
  12.   A wide-angle lens according to any one of claims 1 to 11 and an image sensor that converts an optical image formed on an imaging surface into an electrical signal, and a subject on the imaging surface of the image sensor. An imaging optical apparatus, wherein the wide-angle lens is provided so that an optical image is formed.
  13.   13. A digital apparatus comprising the imaging optical device according to claim 12 to which at least one function of still image shooting and moving image shooting of a subject is added.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007155977A (en) * 2005-12-02 2007-06-21 Nikon Corp Fisheye lens and imaging apparatus
JP2009109723A (en) * 2007-10-30 2009-05-21 Canon Inc Optical system and imaging device provided with it
JP2012113034A (en) * 2010-11-22 2012-06-14 Nikon Corp Optical system, optical device and method of manufacturing optical system
JP2014048488A (en) * 2012-08-31 2014-03-17 Sigma Corp Optical system
JP2014142604A (en) * 2012-12-27 2014-08-07 Panasonic Corp Inner focus lens system, interchangeable lens unit and camera system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007155977A (en) * 2005-12-02 2007-06-21 Nikon Corp Fisheye lens and imaging apparatus
JP2009109723A (en) * 2007-10-30 2009-05-21 Canon Inc Optical system and imaging device provided with it
JP2012113034A (en) * 2010-11-22 2012-06-14 Nikon Corp Optical system, optical device and method of manufacturing optical system
JP2014048488A (en) * 2012-08-31 2014-03-17 Sigma Corp Optical system
JP2014142604A (en) * 2012-12-27 2014-08-07 Panasonic Corp Inner focus lens system, interchangeable lens unit and camera system

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