Full-frame high-magnification anamorphic lens

Abstract

The present invention discloses a full-frame large magnification anamorphic lens, which includes a first lens group, a second lens group, a third lens group, a fourth lens group and an aspherical lens arranged in sequence along the optical axis from the object plane to the image plane. The focal length distribution of each lens of the full-frame large magnification anamorphic lens satisfies the following conditions: 48mm < f(1~17)Y < 52mm; 29.2mm < f(1~17)X < 33.2mm; 1.55 < f(1~17)Y / f(1~17)X < 1.65; 0.16 < f(2~3)Y / f(1~9)Y < 0.48; -4.22 < f(1~3)Y / f(4~9)Y < -1.41; 1.62 < f(1~9)X / f(10~17)X < 4.85; 2.32 < f(1~9)Y / f(10~17)Y < 6.96. By arranging a first lens group composed of a plurality of spherical lenses, a second lens group composed of a plurality of cylindrical lenses, a third lens group composed of a plurality of spherical lenses and a fourth lens group composed of a plurality of cylindrical lenses in sequence along the optical axis from the object plane to the image plane, the present invention comprehensively corrects light rays, "compresses" the light rays entering horizontally and maintains the light rays entering vertically, so as to make the width of the captured picture larger, obtain a picture with a ratio of 2.4:1, realize the full-frame and large magnification of the lens, and has a compact structure and low cost.

Description

Technical Field

[0001] This invention relates to optical lenses, and more particularly to full-frame high-magnification anamorphic lenses. Background Technology

[0002] With the development of social media, sharing of plogs and vlogs is increasing, and taking photos and shooting videos has become a daily routine for ordinary consumers. More and more people are using mobile phones, cameras and other tools to shoot photos, short videos and micro-films.

[0003] Because the lenses of existing mobile phones, tablets, cameras, and other conventional shooting devices have a 16:9 aspect ratio, they cannot capture images with a cinematic aspect ratio (2.4:1), resulting in subpar image quality. Anamorphic lenses specifically designed for film shooting, which can achieve a cinematic aspect ratio (2.4:1), are expensive, bulky, and heavy, making them inconvenient to carry and limiting their use by ordinary consumers. Summary of the Invention

[0004] The purpose of this invention is to provide a full-frame high-magnification anamorphic lens to solve the problem that existing lenses of conventional shooting devices such as mobile phones, tablets, and cameras have a 16:9 aspect ratio, which cannot produce a cinematic aspect ratio (2.4:1), resulting in poor image quality.

[0005] This invention is achieved through the following technical solution:

[0006] A full-frame high-magnification anamorphic lens includes a first lens group, a second lens group, a third lens group, a fourth lens group, and aspherical lenses arranged sequentially along the optical axis from the object plane to the image plane. The first lens group includes a first lens, a second lens, and a third lens arranged sequentially along the optical axis from the object plane to the image plane, wherein the first, second, and third lenses are spherical lenses. The second lens group includes a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object plane to the image plane, wherein the fourth, fifth, and sixth lenses are cylindrical lenses. The third lens group includes... The optical axis is arranged sequentially from the object plane to the image plane using a seventh, eighth, ninth, tenth, eleventh, twelfth, thirteenth, and fourteenth lens, wherein the seventh, eighth, ninth, tenth, eleventh, twelfth, thirteenth, and fourteenth lenses are spherical lenses; the fourth lens group includes a fifteenth and a sixteenth lens arranged sequentially along the optical axis from the object plane to the image plane, wherein the fifteenth and sixteenth lenses are cylindrical lenses; the aspherical lens is defined as the seventeenth lens;

[0007] The focal length distribution of each lens in this full-frame high-magnification anamorphic lens satisfies the following conditions:

[0008] 48mm <f(1~17)Y<52mm;

[0009] 29.2mm <f(1~17)X<33.2mm;

[0010] 1.55 <f(1~17)Y / f(1~17)X<1.65;

[0011] 0.16 <f(2~3)Y / f(1~9)Y<0.48;

[0012] -4.22 <f(1~3)Y / f(4~9)Y<-1.41;

[0013] 1.62 <f(1~9)X / f(10~17)X<4.85;

[0014] 2.32 <f(1~9)Y / f(10~17)Y<6.96;

[0015] Wherein, the curvature direction of the fourth lens is defined as the X direction, the direction perpendicular to the X direction is defined as the Y direction, f(m~n)X is the combined optical focal length of the m-th to n-th lenses along the X direction, f(m~n)Y is the combined optical focal length of the m-th to n-th lenses along the Y direction, 1≤m <n≤17。

[0016] Furthermore, the optical power of the first and second lenses is negative, and the optical power of the third lens is positive; the optical power of the fourth and fifth lenses is negative, and the optical power of the sixth lens is positive; the optical power of the seventh, eighth, tenth, thirteenth, and fourteenth lenses is positive, and the optical power of the ninth, eleventh, and twelfth lenses is negative; the optical power of the fifteenth lens is positive, and the optical power of the sixteenth lens is negative.

[0017] Furthermore, the object side of the first lens is convex and the image side is concave, and its optical power is negative; the object side of the second lens is convex and the image side is concave, and its optical power is negative; the object side of the third lens is convex and the image side is convex, and its optical power is positive.

[0018] In the X direction, the object side of the fourth lens is concave, the image side is concave, and its optical power is negative; the object side of the fifth lens is concave, the image side is concave, and its optical power is negative; the object side of the sixth lens is convex, the image side is convex, and its optical power is positive.

[0019] The seventh lens has a convex object side and a concave image side, and its optical power is positive. The eighth lens has a flat object side and a convex image side, and its optical power is positive. The ninth lens has a concave object side and a concave image side, and its optical power is negative. The tenth lens has a convex object side and a concave image side, and its optical power is positive. The eleventh lens has a convex object side and a concave image side, and its optical power is negative. The twelfth lens has a concave object side and a concave image side, and its optical power is negative. The thirteenth lens has a convex object side and a convex image side, and its optical power is positive. The fourteenth lens has a convex object side and a flat image side, and its optical power is positive.

[0020] In the Y direction, the object side of the fifteenth lens is convex, the image side is convex, and its optical power is positive. The object side of the sixteenth lens is concave, the image side is concave, and its optical power is negative.

[0021] Furthermore, the eighth lens and the ninth lens are cemented together to form a cemented doublet spherical lens one; the tenth lens and the eleventh lens are cemented together to form a cemented doublet spherical lens two; and the twelfth lens and the thirteenth lens are cemented together to form a cemented doublet spherical lens three.

[0022] Furthermore, the fifth lens and the sixth lens are cemented together to form a cemented doublet cylindrical lens one, and the fifteenth lens and the sixteenth lens are cemented together to form a cemented doublet cylindrical lens two.

[0023] Furthermore, the refractive index Nd1 and Abbe number Vd1 of the material of the first lens satisfy: 1.75 < Nd1 < 1.95, 30 < Vd1 < 35; the refractive index Nd2 and Abbe number Vd2 of the material of the second lens satisfy: 1.8 < Nd2 < 2.1, 12 < Vd2 < 19; the refractive index Nd3 and Abbe number Vd3 of the material of the third lens satisfy: 1.75 < Nd3 < 1.95, 18 < Vd3 < 25; the refractive index Nd4 and Abbe number Vd4 of the material of the fourth lens satisfy: 1.65 < Nd4 < 1.85, 47 < Vd4 < 53; the refractive index Nd5 and Abbe number Vd5 of the material of the fifth lens satisfy: 1.65 < Nd5 < 1.85, 21 < Vd5 < 33; the refractive index Nd6 and Abbe number Vd6 of the material of the sixth lens satisfy: 1.8 < Nd6 < 2.0, 26 < Vd6 < 37; the refractive index Nd7 and Abbe number Vd7 of the material of the seventh lens satisfy: 1.75 < Nd7 < 2.15, 26 < Vd7 < 38; the refractive index Nd8 and Abbe number Vd8 of the material of the eighth lens satisfy: 1.65 < Nd8 < 1.9, 36 < Vd8 < 43; the refractive index Nd9 and Abbe number Vd9 of the material of the ninth lens satisfy: 1.55 < Nd9 < 1.75, 32 < Vd9 < 46; the refractive index Nd10 and Abbe number Vd10 of the material of the tenth lens satisfy: 1.7 < Nd10 < 1.9, 43 < Vd10 < 49; the refractive index Nd11 and Abbe number Vd11 of the material of the eleventh lens satisfy: 1.75 < Nd11 < 1.95, 20 < Vd11 < 26; the refractive index Nd12 and Abbe number Vd12 of the material of the twelfth lens satisfy: 1.598 < Nd12 < 1.798, 21 < Vd12 < 27; the refractive index Nd13 and Abbe number Vd13 of the material of the thirteenth lens satisfy: 1.718 < Nd13 < 1.918, 30 < Vd13 < 36; the refractive index Nd14 and Abbe number Vd14 of the material of the fourteenth lens satisfy: 1.645 < Nd14 < 1.845, 40 < Vd14 < 49; the refractive index Nd15 and Abbe number Vd15 of the material of the fifteenth lens satisfy: 1.650 < Nd15 < 1.880, 20 < Vd15 < 32; the refractive index Nd16 and Abbe number Vd16 of the material of the sixteenth lens satisfy: 1.73 < Nd16 < 1.95, 30 < Vd16 < 46; the refractive index Nd17 and Abbe number Vd17 of the material of the seventeenth lens satisfy: 1.6 < Nd17 < 1.9, 40 < Vd17 < 60.

[0024] Furthermore, the second lens and the third lens form an internal focusing group.

[0025] Furthermore, a filter is provided at the front end of the full-frame high-magnification anamorphic lens, and the filter aperture ranges from 57mm to 67mm.

[0026] Furthermore, the focal length of the full-frame high-magnification anamorphic lens in the Y direction is 45mm to 55mm, and / or the zoom ratio of the full-frame high-magnification anamorphic lens is 1.4X to 1.8X; and / or the aperture STO of the full-frame high-magnification anamorphic lens is located between the ninth lens and the tenth lens.

[0027] Furthermore, each lens in the first lens group, the second lens group, the third lens group, and the fourth lens group is made of optical glass, and the aspherical lens is made of high-precision glass aspherical.

[0028] The advantage of this technical solution lies in the fact that by sequentially arranging a first lens group consisting of several spherical lenses, a second lens group consisting of several cylindrical lenses, a third lens group consisting of several spherical lenses, and a fourth lens group consisting of several cylindrical lenses along the optical axis from the object plane to the image plane, and by rationally allocating the optical power, the first, third, and fourth lens groups are used to comprehensively correct the light, and the second lens group is used to "compress" the horizontally entering light and maintain the vertically entering light, the width of the captured image is increased, resulting in an image with an aspect ratio of 2.4:1. This achieves full-frame and high magnification of the lens, while making the optical structure of the anamorphic lens compact and small, thus reducing costs. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0031] Figure 1 This is an optical structure diagram of a full-frame high-magnification anamorphic lens with an object-image distance of infinity in the X direction, as disclosed in the embodiment.

[0032] Figure 2 This is an optical structure diagram of a full-frame high-magnification anamorphic lens with the object-image distance at infinity in the Y direction, as disclosed in the embodiment.

[0033] Figure 3 This is the optical MTF diagram of the full-frame high-magnification anamorphic lens at infinity, as disclosed in the embodiment;

[0034] Figure 4 This is the optical field curvature and distortion diagram of the full-frame high-magnification anamorphic lens at infinity object distance disclosed in the embodiment;

[0035] Figure 5 This is an optical structure diagram of a full-frame high-magnification anamorphic lens with an object-image distance of 0.7m in the X direction, as disclosed in the embodiment.

[0036] Figure 6 This is an optical structure diagram of a full-frame high-magnification anamorphic lens with an object-image distance of 0.7m in the Y direction, as disclosed in the embodiment.

[0037] Figure 7 The optical MTF chart of the full-frame high-magnification anamorphic lens at an object-image distance of 0.7m disclosed in the embodiment;

[0038] Figure 8 The image shown is an optical field curvature and distortion diagram of a full-frame high-magnification anamorphic lens at an object-image distance of 0.7m, as disclosed in the embodiment. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Example: Figure 1-2As shown, this full-frame high-magnification anamorphic lens includes a first lens group 1, a second lens group 2, a third lens group 3, a fourth lens group 4, and an aspherical lens 5 arranged sequentially along the optical axis from the object plane to the image plane. The first lens group 1 includes a first lens 101, a second lens 102, and a third lens 103 arranged sequentially along the optical axis from the object plane to the image plane. The first lens 101, second lens 102, and third lens 103 are spherical lenses. The second lens group 2 includes a fourth lens 201, a fifth lens 202, and a sixth lens 203 arranged sequentially along the optical axis from the object plane to the image plane. The fourth lens 201, fifth lens 202, and sixth lens 203 are cylindrical lenses. The third lens group 4 includes a first lens 101, a second lens 102, and a third lens 103 arranged sequentially along the optical axis from the object plane to the image plane. The aspherical lens 5 is arranged in the first lens group 1. The second lens group 2 includes a first lens 101, a second lens 102, and a third lens 103 arranged sequentially along the optical axis from the object plane to the image plane. The fourth lens 101, second lens 102, and third lens 103 are spherical lenses. The fifth lens group 2 includes a first lens 101, a second lens 102, and a third lens 103 arranged sequentially along the optical axis from the object plane to the image plane ... The seventh lens 301, eighth lens 302, ninth lens 303, tenth lens 304, eleventh lens 305, twelfth lens 306, thirteenth lens 307, and fourteenth lens 308 are arranged sequentially from the object plane to the image plane. The seventh lens 301, eighth lens 302, ninth lens 303, tenth lens 304, eleventh lens 305, twelfth lens 306, thirteenth lens 307, and fourteenth lens 308 are spherical lenses. The fourth lens group 4 includes the fifteenth lens 401 and sixteenth lens 402 arranged sequentially from the object plane to the image plane along the optical axis. The fifteenth lens 401 and sixteenth lens 402 are cylindrical lenses. The aspherical lens 5 is defined as the seventeenth lens.

[0041] The focal length distribution of each lens in this full-frame high-magnification anamorphic lens satisfies the following conditions:

[0042] 48mm <f(1~17)Y<52mm;

[0043] 29.2mm <f(1~17)X<33.2mm;

[0044] 1.55 <f(1~17)Y / f(1~17)X<1.65;

[0045] 0.16 <f(2~3)Y / f(1~9)Y<0.48;

[0046] -4.22 <f(1~3)Y / f(4~9)Y<-1.41;

[0047] 1.62 <f(1~9)X / f(10~17)X<4.85;

[0048] 2.32 <f(1~9)Y / f(10~17)Y<6.96;

[0049] In this context, the curvature direction of the fourth lens 201 is defined as the X direction, the direction perpendicular to the X direction is defined as the Y direction, f(m~n)X is the combined optical focal length of the m-th to n-th lenses along the X direction, and f(m~n)Y is the combined optical focal length of the m-th to n-th lenses along the Y direction, where 1≤m <n≤17。

[0050] The lens comprises a first lens group 1 (composed of several spherical lenses), a third lens group 3 (composed of several spherical lenses), and a fourth lens group 4 (composed of several cylindrical lenses) for comprehensive correction of light. A second lens group 2 (composed of several cylindrical lenses) "compresses" horizontally entering light while maintaining vertically entering light, thereby increasing the field of view for horizontal shooting. This allows the full-frame, high-magnification anamorphic lens to achieve a 2.4:1 aspect ratio, realizing both full-frame and high magnification. Furthermore, because the aspherical lens 5 effectively corrects spherical aberration and astigmatism, it improves the lens's resolution, reduces its size and weight, and allows for miniaturization and portability of the full-frame, high-magnification anamorphic lens.

[0051] In summary, this embodiment provides a full-frame, high-magnification anamorphic lens to address the problem that existing lenses in conventional shooting devices such as mobile phones, tablets, and cameras have a 16:9 aspect ratio, which cannot produce a cinematic aspect ratio (2.4:1), resulting in poor image quality. This is achieved by sequentially arranging a first lens group 1 (composed of several spherical lenses), a second lens group 2 (composed of several cylindrical lenses), a third lens group 3 (composed of several spherical lenses), and a fourth lens group 4 (composed of several cylindrical lenses) along the optical axis from the object plane to the image plane. The optical power of each lens is rationally allocated. The first lens group 1, third lens group 3, and fourth lens group 4 comprehensively correct the light, while the second lens group 2 "compresses" horizontally entering light and maintains vertically entering light, thus increasing the width of the captured image to achieve a 2.4:1 aspect ratio. This achieves full-frame and high-magnification capabilities, while also making the optical structure of the anamorphic lens compact and low-cost.

[0052] In another embodiment, the full-frame high-magnification anamorphic lens is not limited to 17 lenses. The number of lenses in the anamorphic lens can be further varied, as long as the focal length distribution of each lens in the anamorphic lens satisfies the above mathematical relationship.

[0053] In this embodiment of the invention, the object side of the first lens 101 is convex and the image side is concave, and its optical power is negative; the object side of the second lens 102 is convex and the image side is concave, and its optical power is negative; the object side of the third lens 103 is convex and the image side is convex, and its optical power is positive.

[0054] In the X direction, the fourth lens 201 has a concave object plane and a concave image plane, and its optical power is negative. The fifth lens 202 has a concave object plane and a concave image plane, and its optical power is negative. The sixth lens 203 has a convex object plane and a convex image plane, and its optical power is positive. The seventh lens 301 has a convex object plane and a concave image plane, and its optical power is positive. The eighth lens 302 has a flat object plane and a convex image plane, and its optical power is positive. The ninth lens 303 has a concave object plane. The object side of the tenth lens 304 is concave, and the image side is concave, so its optical power is positive. The object side of the eleventh lens 305 is convex, and the image side is concave, so its optical power is negative. The object side of the twelfth lens 306 is concave, and the image side is concave, so its optical power is negative. The object side of the thirteenth lens 307 is convex, and the image side is convex, so its optical power is positive. The object side of the fourteenth lens 308 is convex, and the image side is flat, so its optical power is positive.

[0055] In the Y direction, the object side of the fifteenth lens 401 is convex, and the image side is also convex, with a positive optical power. The object side of the sixteenth lens 402 is concave, and the image side is also concave, with a negative optical power. The lenses in this full-frame high-magnification anamorphic lens adopt the above parameters, which conforms to the mathematical relationship of the focal length allocation of each lens.

[0056] In this embodiment of the invention, the eighth lens 302 and the ninth lens 303 are cemented together to form a cemented doublet spherical lens one (not shown in the figure); the tenth lens 304 and the eleventh lens 305 are cemented together to form a cemented doublet spherical lens two (not shown in the figure); and the twelfth lens 306 and the thirteenth lens 307 are cemented together to form a cemented doublet spherical lens three (not shown in the figure). Since the cemented doublet spherical lens can correct the optical chromatic aberration in both the horizontal and vertical directions of a high-magnification anamorphic lens, it gives the full-frame high-magnification anamorphic lens excellent optical performance.

[0057] In this embodiment of the invention, the fifth lens 202 and the sixth lens 203 are cemented together to form a cemented doublet cylindrical lens (not shown in the figure), and the fifteenth lens 401 and the sixteenth lens 402 are cemented together to form a cemented doublet cylindrical lens (not shown in the figure). Since the cemented doublet cylindrical lens can correct the optical chromatic aberration in the horizontal and vertical directions of the high-magnification anamorphic lens, it gives the full-frame high-magnification anamorphic lens good optical performance.

[0058] It should be noted that the above-mentioned adhesive structure is joined by bonding. As an alternative implementation, based on the concept of this invention, changes to the above-mentioned joining method to distinguish it from this application, such as bonding, integral molding, etc., and adaptive changes to the shape of the joined lens, should also be included in the protection scope of this application. For a single lens or two consecutive lenses with the same optical power, a single lens can be split into two or more lenses, or two consecutive lenses with the same optical power can be combined into one lens. Such simple transformations to the optical structure of this patent, such as the optical power allocation of the transformed lens or lens group within the range of the mathematical expression, should also be included in the protection scope of this application. Based on this embodiment, changes or substitutions to the number of lenses or the combination method to distinguish it from this application, without departing from the spirit of this application, are all within the protection scope of this application.

[0059] In the embodiments of the present invention, the refractive index Nd1 and Abbe number Vd1 of the material of the first lens satisfy: 1.75 < Nd1 < 1.95, 30 < Vd1 < 35; the refractive index Nd2 and Abbe number Vd2 of the material of the second lens satisfy: 1.8 < Nd2 < 2.1, 12 < Vd2 < 19; the refractive index Nd3 and Abbe number Vd3 of the material of the third lens satisfy: 1.75 < Nd3 < 1.95, 18 < Vd3 < 25; the refractive index Nd4 and Abbe number Vd4 of the material of the fourth lens satisfy: 1.65 < Nd4 < 1.85, 47 < Vd4 < 53; the refractive index Nd5 and Abbe number Vd5 of the material of the fifth lens satisfy: 1.65 < Nd5 < 1.85, 21 < Vd5 < 33; the refractive index Nd6 and Abbe number Vd6 of the material of the sixth lens satisfy: 1.8 < Nd6 < 2.0, 26 < Vd6 < 37; the refractive index Nd7 and Abbe number Vd7 of the material of the seventh lens satisfy: 1.75 < Nd7 < 2.15, 26 < Vd7 < 38; the refractive index Nd8 and Abbe number Vd8 of the material of the eighth lens satisfy: 1.65 < Nd8 < 1.9, 36 < Vd8 < 43; the refractive index Nd9 and Abbe number Vd9 of the material of the ninth lens satisfy: 1.55 < Nd9 < 1.75, 32 < Vd9 < 46; the refractive index Nd10 and Abbe number Vd10 of the material of the tenth lens satisfy: 1.7 < Nd10 < 1.9, 43 < Vd10 < 49; the refractive index Nd11 and Abbe number Vd11 of the material of the eleventh lens satisfy: 1.75 < Nd11 < 1.95, 20 < Vd11 < 26; the refractive index Nd12 and Abbe number Vd12 of the material of the twelfth lens satisfy: 1.598 < Nd12 < 1.798, 21 < Vd12 < 27; the refractive index Nd13 and Abbe number Vd13 of the material of the thirteenth lens satisfy: 1.718 < Nd13 < 1.918, 30 < Vd13 < 36; the refractive index Nd14 and Abbe number Vd14 of the material of the fourteenth lens satisfy: 1.645 < Nd14 < 1.845, 40 < Vd14 < 49; the refractive index Nd15 and Abbe number Vd15 of the material of the fifteenth lens satisfy: 1.650 < Nd15 < 1.880, 20 < Vd15 < 32; the refractive index Nd16 and Abbe number Vd16 of the material of the sixteenth lens satisfy: 1.73 < Nd16 < 1.95, 30 < Vd16 < 46; the refractive index Nd17 and Abbe number Vd17 of the material of the seventeenth lens satisfy: 1.6 < Nd17 < 1.9, 40 < Vd17 < 60. With the refractive indices and Abbe numbers of the lenses in the full-frame large magnification anamorphic lens taking the above values, it conforms to the mathematical relationship of the focal length distribution of each lens.

[0060] In this embodiment, the actual parameters of each lens are shown in Table 1 and Table 2. Table 1 shows some parameters of the first lens 101 to the seventeenth lens, and Table 2 shows other parameters of the seventeenth lens.

[0061]

[0062]

[0063]

[0064] Table 1

[0065]

[0066] Table 2

[0067] like Figure 1 and Figure 5 ,as well as Figure 2 and Figure 6 As shown, in this embodiment of the invention, the second lens 102 and the third lens 103 form an internal focusing group. Since the second lens 102 and the third lens 103 form an internal focusing group, the overall length of the lens remains constant when adjusting the focal length. Furthermore, using a floating internal focusing group allows for focusing from an object-image distance of 0.7m to infinity, while overcoming the technical difficulties of large breathing effect and inconsistent magnification in 50mm anamorphic lenses.

[0068] Figure 3 The figure shows the MTF curve of the anamorphic lens. As can be seen from the curve, the MTF is greater than 0.2 for all fields of view. This anamorphic lens in this embodiment has good resolution and can achieve high-definition image quality. (See also...) Figure 4 As shown, the distortion is less than 5%, ensuring that the image shows minimal distortion.

[0069] Reference Figure 5 and Figure 6 By adjusting the internal focus group within the anamorphic lens, the overall length of the lens remains constant, achieving an ultra-close object distance of 0.7m for a high-magnification anamorphic lens on a full-frame camera. (See also...) Figure 7 The figure shows the MTF curve of the anamorphic lens. As can be seen from the curve, the minimum MTF for each field of view is approximately 0.1. (See also...) Figure 8 As shown, the distortion is less than 8%, ensuring that the image shows a small deformation, which is consistent with the COOK widening imaging style.

[0070] In this embodiment of the invention, a filter (not shown in the figure) is provided at the front end of the full-frame high-magnification anamorphic lens, and the filter aperture ranges from 57mm to 67mm. Preferably, the filter aperture is 62mm. Because a filter is provided at the front end of the full-frame high-magnification anamorphic lens, the lens can filter out stray light and improve image quality.

[0071] In this embodiment of the invention, the full-frame high-magnification anamorphic lens has a focal length of 45mm to 55mm in the Y direction and a zoom ratio of 1.4X to 1.8X. More specifically, the full-frame high-magnification anamorphic lens has a focal length of 50mm in the Y direction, a zoom ratio of 1.6X, and a weight of less than 453g.

[0072] In this embodiment of the invention, the aperture stop STO of the full-frame high-magnification anamorphic lens is located between the ninth lens 303 and the tenth lens 304.

[0073] In this embodiment of the invention, each lens in the first lens group 1, the second lens group 2, the third lens group 3, and the fourth lens group 4 may be made of optical glass, but is not limited to optical glass lenses, and the aspherical lens 5 may be made of, but is not limited to, high-precision glass aspherical surfaces. Because each lens in the first lens group 1, the second lens group 2, the third lens group 3, and the fourth lens group 4 uses optical glass lenses, and the aspherical lens 5 uses high-precision glass aspherical surfaces, it has the advantages of wide temperature adaptability, simple structure, low processing difficulty, easy storage, and low production cost.

[0074] It should be noted that this full-frame high-magnification anamorphic lens adopts an integrated design, achieving a miniaturized lens while obtaining excellent optical performance at a high cost-performance ratio, including high resolution, low breathing, low distortion, full-frame capability, and 1.6X high magnification. It can be designed to match the lens mounts of various brands of cameras on the market according to actual usage needs, so as to achieve personalized customization and universal compatibility.

[0075] It should be understood that the terms "first," "second," etc., are used in this invention to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this invention, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information. In addition, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0076] The above description provides one or more embodiments in conjunction with specific content, and does not imply that the specific implementation of the present invention is limited to these descriptions. Any methods or structures that are similar to or identical to those of the present invention, or any technical deductions or substitutions made based on the concept of the present invention, should be considered as protected by the present invention.

Claims

1. A full-frame, high-magnification anamorphic lens, characterized in that: The anamorphic lens consists of 17 lenses, including a first lens group, a second lens group, a third lens group, a fourth lens group, and an aspherical lens arranged sequentially along the optical axis from the object plane to the image plane. The first lens group includes a first lens, a second lens, and a third lens arranged sequentially along the optical axis from the object plane to the image plane, wherein the first lens, the second lens, and the third lens are spherical lenses; The second lens group includes a fourth lens, a fifth lens, and a sixth lens arranged sequentially along the optical axis from the object plane to the image plane, wherein the fourth lens, the fifth lens, and the sixth lens are cylindrical lenses; The third lens group includes a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens, and a fourteenth lens arranged sequentially along the optical axis from the object plane to the image plane. The seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, the twelfth lens, the thirteenth lens, and the fourteenth lens are spherical lenses. The fourth lens group includes a fifteenth lens and a sixteenth lens arranged sequentially along the optical axis from the object plane to the image plane, wherein the fifteenth lens and the sixteenth lens are cylindrical lenses; The aspherical lens is defined as the seventeenth lens; The focal length distribution of each lens in this full-frame high-magnification anamorphic lens satisfies the following conditions: 48mm <f(1~17)Y<52mm; 29.2mm <f(1~17)X<33.2mm; 1.55 <f(1~17)Y / f(1~17)X<1.65; 0.16 <f(2~3)Y / f(1~9)Y<0.48 -4.22 <f(1~3)Y / f(4~9)Y<-1.41 1.62 <f(1~9)X / f(10~17)X<4.85 2.32 <f(1~9)Y / f(10~17)Y<6.96; Wherein, the curvature direction of the fourth lens is defined as the X direction, the direction perpendicular to the X direction is defined as the Y direction, f(m~n)X is the combined optical focal length of the m-th to n-th lenses along the X direction, f(m~n)Y is the combined optical focal length of the m-th to n-th lenses along the Y direction, 1≤m <n≤17; The first and second lenses have negative optical power, the third lens has positive optical power, the fourth and fifth lenses have negative optical power, the sixth lens has positive optical power, the seventh, eighth, tenth, thirteenth and fourteenth lenses have positive optical power, the ninth, eleventh and twelfth lenses have negative optical power, the fifteenth lens has positive optical power, and the sixteenth lens has negative optical power. The second and third lenses form an inner focusing group.

2. The full-frame high-magnification anamorphic lens according to claim 1, characterized in that, The first lens has a convex surface on the object side and a concave surface on the image side; the second lens has a convex surface on the object side and a concave surface on the image side; and the third lens has a convex surface on both the object side and the image side. In the X direction, the object side of the fourth lens is concave and the image side is concave; the object side of the fifth lens is concave and the image side is concave; and the object side of the sixth lens is convex and the image side is convex. The seventh lens has a convex object plane and a concave image plane; the eighth lens has a flat object plane and a convex image plane; the ninth lens has a concave object plane and a concave image plane; the tenth lens has a convex object plane and a concave image plane; the eleventh lens has a convex object plane and a concave image plane; the twelfth lens has a concave object plane and a concave image plane; the thirteenth lens has a convex object plane and a convex image plane; and the fourteenth lens has a convex object plane and a flat image plane. In the Y direction, the object side of the fifteenth lens is convex and the image side is convex, while the object side of the sixteenth lens is concave and the image side is concave.

3. The full-frame high-magnification anamorphic lens according to claim 2, characterized in that, The eighth lens and the ninth lens are cemented together to form a cemented doublet spherical lens one; the tenth lens and the eleventh lens are cemented together to form a cemented doublet spherical lens two; and the twelfth lens and the thirteenth lens are cemented together to form a cemented doublet spherical lens three.

4. The full-frame high-magnification anamorphic lens according to claim 2, characterized in that, The fifth lens and the sixth lens are cemented together to form a cemented doublet cylindrical lens one, and the fifteenth lens and the sixteenth lens are cemented together to form a cemented doublet cylindrical lens two.

5. The full-frame high-magnification anamorphic lens according to claim 1, characterized in that, The refractive index Nd1 and Abbe constant Vd1 of the material of the first lens satisfy: 1.75 <Nd1<1.95,30<Vd1<35; The refractive index Nd2 and Abbe constant Vd2 of the material of the second lens satisfy: 1.8 <Nd2<2.1,12<Vd2<19; The refractive index Nd3 and Abbe constant Vd3 of the material of the third lens satisfy: 1.75 <Nd3<1.95,18<Vd3<25; The refractive index Nd4 and Abbe constant Vd4 of the material of the fourth lens satisfy: 1.65 <Nd4<1.85,47<Vd4<53; The refractive index Nd5 and Abbe constant Vd5 of the fifth lens satisfy: 1.65 <Nd5<1.85,21<Vd5<33; The refractive index Nd6 and Abbe constant Vd6 of the material of the sixth lens satisfy: 1.8 <Nd6<2.0,26<Vd6<37; The refractive index Nd7 and Abbe constant Vd7 of the seventh lens satisfy: 1.75 <Nd7<2.15,26<Vd7<38; The refractive index Nd8 and Abbe constant Vd8 of the material of the eighth lens satisfy: 1.65 <Nd8<1.9,36<Vd8<43; The refractive index Nd9 and Abbe constant Vd9 of the material of the ninth lens satisfy: 1.55 <Nd9<1.75,32<Vd9<46; The refractive index Nd10 and Abbe constant Vd10 of the tenth lens satisfy: 1.7 <Nd10<1.9,43<Vd10<49; The refractive index Nd11 and Abbe constant Vd11 of the eleventh lens satisfy: 1.

75. <Nd11<1.95,20<Vd11<26; The refractive index Nd12 and Abbe constant Vd12 of the material of the twelfth lens satisfy: 1.598 <Nd12<1.798,21<Vd12<27; The refractive index Nd13 and Abbe constant Vd13 of the thirteenth lens satisfy the following condition: 1.

718. <Nd13<1.918,30<Vd13<36; The refractive index Nd14 and Abbe constant Vd14 of the material of the fourteenth lens satisfy: 1.

645. <Nd14<1.845,40<Vd14<49; The refractive index Nd15 and Abbe constant Vd15 of the fifteenth lens satisfy: 1.

650. <Nd15<1.880,20<Vd15<32; The refractive index Nd16 and Abbe constant Vd16 of the material of the sixteenth lens satisfy: 1.

73. <Nd16<1.95,30<Vd16<46; The refractive index Nd17 and Abbe constant Vd17 of the material of the seventeenth lens satisfy: 1.6 <Nd17<1.9,40<Vd17<60。 6. The full-frame high-magnification anamorphic lens according to claim 1, characterized in that, The front end of the full-frame high-magnification anamorphic lens is equipped with a filter, and the filter aperture ranges from 57mm to 67mm.

7. The full-frame high-magnification anamorphic lens according to claim 1, characterized in that, The full-frame high-magnification anamorphic lens has a focal length of 45mm to 55mm in the Y direction, and / or the zoom ratio of the full-frame high-magnification anamorphic lens is 1.4X to 1.8X; and / or the aperture STO of the full-frame high-magnification anamorphic lens is located between the ninth lens and the tenth lens.

8. The full-frame high-magnification anamorphic lens according to claim 1, characterized in that, Each lens in the first lens group, the second lens group, the third lens group, and the fourth lens group is made of optical glass, and the aspherical lens is made of high-precision glass aspherical.

Images