Medium telephoto full-frame high-magnification anamorphic lens

Abstract

The present invention discloses a medium and long focal length 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 from the object plane to the image plane along the optical axis. The focal length distribution of each lens of the medium and long focal length full-frame large magnification anamorphic lens satisfies the following conditions: 73mm < f(1~15)Y < 77mm, 44mm < f(1~15)X < 49mm, 1.55 < f(1~15)Y / f(1~15)X < 1.65, 0.2 < f(2)Y / f(1~8)Y < 0.7, 7.8 < f(1~2)Y / f(3~8)Y < 23.3, 0.4 < f(1~8)X / f(9~15)X < 1.2, 0.5 < f(1~8)Y / f(9~15)Y < 1.5. By sequentially 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 from the object plane to the image plane along the optical axis, 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 medium-telephoto 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 conventional shooting devices such as mobile phones, tablets, and cameras have a 16:9 aspect ratio, they cannot capture images with a cinematic 2.4:1 aspect ratio, resulting in subpar image quality. Anamorphic lenses specifically designed for film shooting, which can achieve a cinematic 2.4:1 aspect ratio, 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 medium-to-long telephoto 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 2.4:1 aspect ratio, resulting in poor image quality.

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

[0006] A medium-telephoto full-frame high-magnification anamorphic lens, comprising 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;

[0007] The first lens group includes a first lens and a second lens arranged sequentially along the optical axis from the object plane to the image plane, wherein the first lens and the second lens are spherical lenses;

[0008] The second lens group includes a third lens, a fourth lens, and a fifth lens arranged sequentially along the optical axis from the object plane to the image plane, wherein the third lens, the fourth lens, and the fifth lens are cylindrical lenses;

[0009] The third lens group includes a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, and a twelfth lens arranged sequentially along the optical axis from the object plane to the image plane. The sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, and the twelfth lens are spherical lenses.

[0010] The fourth lens group includes a thirteenth lens and a fourteenth lens arranged sequentially from the object plane to the image plane along the optical axis, wherein the thirteenth lens and the fourteenth lens are cylindrical lenses;

[0011] The aspherical lens is defined as the fifteenth lens;

[0012] The focal length distribution of each lens in this medium-long telephoto full-frame high-magnification anamorphic lens meets the following conditions:

[0013] 73mm <f(1~15)Y<77mm;

[0014] 44mm <f(1~15)X<49mm;

[0015] 1.55 <f(1~15)Y / f(1~15)X<1.65;

[0016] 0.2 <f(2)Y / f(1~8)Y<0.7;

[0017] 7.8 <f(1~2)Y / f(3~8)Y<23.3;

[0018] 0.4 <f(1~8)X / f(9~15)X<1.2;

[0019] 0.5 <f(1~8)Y / f(9~15)Y<1.5;

[0020] Wherein, the curvature direction of the third 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≤15。

[0021] Furthermore, the first lens has a negative optical power, the second lens has a positive optical power; the third and fourth lenses have negative optical power, the fifth lens has a positive optical power; the sixth, seventh, ninth, and twelfth lenses have positive optical power, the eighth, tenth, and eleventh lenses have negative optical power; the thirteenth lens has a positive optical power, and the fourteenth lens has a negative optical power.

[0022] Furthermore, the seventh lens and the eighth lens are cemented together to form a cemented doublet spherical lens one; the ninth lens and the tenth lens are cemented together to form a cemented doublet spherical lens two.

[0023] Furthermore, the fourth lens and the fifth lens are cemented together to form a cemented doublet cylindrical lens one; the thirteenth lens and the fourteenth lens are cemented together to form a cemented doublet cylindrical lens two.

[0024] Further, the refractive index Nd1 and Abbe number Vd1 of the material of the first lens satisfy: 1.7 < Nd1 < 1.8, 42 < Vd1 < 55; the refractive index Nd2 and Abbe number Vd2 of the material of the second lens satisfy: 1.5 < Nd2 < 1.66, 42 < Vd2 < 60; the refractive index Nd3 and Abbe number Vd3 of the material of the third lens satisfy: 1.75 < Nd3 < 1.85, 34 < Vd3 < 46; the refractive index Nd4 and Abbe number Vd4 of the material of the fourth lens satisfy: 1.5 < Nd4 < 1.68, 50 < Vd4 < 60; the refractive index Nd5 and Abbe number Vd5 of the material of the fifth lens satisfy: 1.75 < Nd5 < 1.85, 36 < Vd5 < 48; the refractive index Nd6 and Abbe number Vd6 of the material of the sixth lens satisfy: 1.8 < Nd6 < 1.9, 32 < Vd6 < 43; the refractive index Nd7 and Abbe number Vd7 of the material of the seventh lens satisfy: 1.88 < Nd7 < 2, 16 < Vd7 < 26; the refractive index Nd8 and Abbe number Vd8 of the material of the eighth lens satisfy: 1.7 < Nd8 < 1.82, 21 < Vd8 < 33; the refractive index Nd9 and Abbe number Vd9 of the material of the ninth lens satisfy: 1.8 < Nd9 < 1.9, 4 < Vd9 < 55; the refractive index Nd10 and Abbe number Vd10 of the material of the tenth lens satisfy: 1.7 < Nd10 < 1.9, 22 < Vd10 < 34; the refractive index Nd11 and Abbe number Vd11 of the material of the eleventh lens satisfy: 1.75 < Nd11 < 1.95, 20 < Vd11 < 36; the refractive index Nd12 and Abbe number Vd12 of the material of the twelfth lens satisfy: 1.7 < Nd12 < 1.88, 42 < Vd12 < 55; the refractive index Nd13 and Abbe number Vd13 of the material of the thirteenth lens satisfy: 1.78 < Nd13 < 1.9, 23 < Vd13 < 32; the refractive index Nd14 and Abbe number Vd14 of the material of the fourteenth lens satisfy: 1.8 < Nd14 < 1.95, 32 < Vd14 < 48; the refractive index Nd15 and Abbe number Vd15 of the material of the fifteenth lens satisfy: 1.65 < Nd15 < 1.83, 37 < Vd15 < 52.

[0025] Further, the second lens can move along the optical axis between the first lens and the third lens for focusing.

[0026] Further, a filter is provided at the front end of the long - focal - length full - frame large - magnification anamorphic lens, and the value range of the filter diameter is: 58 mm to 62 mm.

[0027] Furthermore, the focal length of the medium telephoto full-frame high-magnification anamorphic lens in the Y direction is 73mm to 77mm, and / or the zoom ratio of the medium telephoto full-frame high-magnification anamorphic lens is 1.4X to 1.8X; and / or the aperture STO of the medium telephoto full-frame high-magnification anamorphic lens is located between the eighth lens and the ninth lens.

[0028] 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.

[0029] The advantage of this technical solution lies in 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 of each lens, 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, resulting in a larger image width and a 2.4:1 aspect ratio. This achieves full-frame and high magnification of the lens, while also making the optical structure of the anamorphic lens compact and low in cost. Attached Figure Description

[0030] 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.

[0031] 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.

[0032] Figure 1 This is an optical structure diagram of a medium-long telephoto full-frame high-magnification anamorphic lens with an object-image distance of infinity in the X direction, as disclosed in the embodiment.

[0033] Figure 2 This is an optical structure diagram of a medium-long telephoto full-frame high-magnification anamorphic lens with an object-image distance of infinity in the Y direction, as disclosed in the embodiment.

[0034] Figure 3 This is the optical field curvature and distortion diagram of the medium-long telephoto full-frame high-magnification anamorphic lens disclosed in the embodiment at infinity object-image distance;

[0035] Figure 4 This is an optical structure diagram of the medium-long telephoto full-frame high-magnification anamorphic lens disclosed in the embodiment, with an object-image distance of 0.9m in the X direction;

[0036] Figure 5 This is an optical structure diagram of a medium-long telephoto full-frame high-magnification anamorphic lens with an object-image distance of 0.9m in the Y direction, as disclosed in the embodiment.

[0037] Figure 6 The image shows the optical field curvature and distortion of a medium-long telephoto full-frame high-magnification anamorphic lens at an object-image distance of 0.9m, as disclosed in the embodiment. Detailed Implementation

[0038] 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.

[0039] Example: Figure 1-2 As shown, the medium telephoto full-frame high-magnification anamorphic lens includes a first lens group 100, a second lens group 200, a third lens group 300, a fourth lens group 400, and an aspherical lens arranged sequentially along the optical axis from the object plane to the image plane.

[0040] The first lens group 100 includes a first lens 1 and a second lens 2 arranged sequentially from the object plane to the image plane along the optical axis, wherein the first lens 1 and the second lens 2 are spherical lenses;

[0041] The second lens group 200 includes a third lens 3, a fourth lens 4, and a fifth lens 5 arranged sequentially from the object plane to the image plane along the optical axis. The third lens 3, the fourth lens 4, and the fifth lens 5 are cylindrical lenses.

[0042] The third lens group 300 includes a sixth lens 6, a seventh lens 7, an eighth lens 8, a ninth lens 9, a tenth lens 10, an eleventh lens 11, and a twelfth lens 12 arranged sequentially along the optical axis from the object plane to the image plane. The sixth lens 6, the seventh lens 7, the eighth lens 8, the ninth lens 9, the tenth lens 10, the eleventh lens 11, and the twelfth lens 12 are spherical lenses.

[0043] The fourth lens group 400 includes a thirteenth lens 13 and a fourteenth lens 14 arranged sequentially from the object plane to the image plane along the optical axis. The thirteenth lens 13 and the fourteenth lens 14 are cylindrical lenses.

[0044] Aspherical lenses are defined as the fifteenth lens (15).

[0045] The focal length distribution of each lens in this medium-long telephoto full-frame high-magnification anamorphic lens meets the following conditions:

[0046] 73mm <f(1~15)Y<77mm;

[0047] 44mm <f(1~15)X<49mm;

[0048] 1.55 <f(1~15)Y / f(1~15)X<1.65;

[0049] 0.2 <f(2)Y / f(1~8)Y<0.7;

[0050] 7.8 <f(1~2)Y / f(3~8)Y<23.3;

[0051] 0.4 <f(1~8)X / f(9~15)X<1.2;

[0052] 0.5 <f(1~8)Y / f(9~15)Y<1.5;

[0053] Wherein, the curvature direction of the third lens 3 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, 1≤m <n≤15。

[0054] The lens comprises a first lens group 100 (composed of several spherical lenses), a third lens group 300 (composed of several spherical lenses), and a fourth lens group 400 (composed of several cylindrical lenses) for comprehensive light correction. A second lens group 200 (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 aspect ratio of the image captured by this mid-telephoto full-frame high-magnification anamorphic lens to reach 2.4:1, achieving full-frame and high magnification. Furthermore, since aspherical lenses effectively correct spherical aberration and astigmatism, they improve the lens's resolution, reduce its size and weight, and allow for miniaturization and portability of this mid-telephoto full-frame high-magnification anamorphic lens.

[0055] In summary, this embodiment provides a medium-to-long telephoto 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 2.4:1 aspect ratio, resulting in poor image quality. This is achieved by sequentially arranging a first lens group 100 composed of several spherical lenses, a second lens group 200 composed of several cylindrical lenses, a third lens group 300 composed of several spherical lenses, and a fourth lens group 400 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 100, the third lens group 300, and the fourth lens group 400 comprehensively correct the light, while the second lens group 200 "compresses" horizontally entering light and maintains vertically entering light, thereby increasing the width of the captured image and achieving a 2.4:1 aspect ratio. This achieves full-frame and high magnification, while also making the optical structure of the anamorphic lens compact and low-cost.

[0056] In another embodiment, the medium telephoto full-frame high-magnification anamorphic lens is not limited to 15 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.

[0057] In this embodiment of the invention, the optical power of the first lens 1 is negative, the optical power of the second lens 2 is positive; the optical power of the third lens 3 and the fourth lens 4 is negative, the optical power of the fifth lens 5 is positive; the optical power of the sixth lens 6, the seventh lens 7, the ninth lens 9, and the twelfth lens 12 is positive, the optical power of the eighth lens 8, the tenth lens 10, and the eleventh lens 11 is negative; the optical power of the thirteenth lens 13 is positive, and the optical power of the fourteenth lens 14 is negative. The lenses in this medium-long telephoto full-frame high-magnification anamorphic lens employ the above parameters, conforming to the mathematical relationship of focal length allocation for each lens.

[0058] In this embodiment of the invention, the seventh lens 7 and the eighth lens 8 are cemented together to form a cemented doublet spherical lens one (not shown in the figure); the ninth lens 9 and the tenth lens 10 are cemented together to form a cemented doublet spherical lens two (not shown in the figure). Since the cemented doublet spherical 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.

[0059] In this embodiment of the invention, the fourth lens 4 and the fifth lens 5 are cemented together to form a cemented doublet cylindrical lens (not shown in the figure); the thirteenth lens 13 and the fourteenth lens 14 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.

[0060] 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.

[0061] In an embodiment of the present invention, the refractive index Nd1 and Abbe number Vd1 of the material of the first lens 1 satisfy: 1.7 < Nd1 < 1.8, 42 < Vd1 < 55; the refractive index Nd2 and Abbe number Vd2 of the material of the second lens 2 satisfy: 1.5 < Nd2 < 1.66, 42 < Vd2 < 60; the refractive index Nd3 and Abbe number Vd3 of the material of the third lens 3 satisfy: 1.75 < Nd3 < 1.85, 34 < Vd3 < 46; the refractive index Nd4 and Abbe number Vd4 of the material of the fourth lens 4 satisfy: 1.5 < Nd4 < 1.68, 50 < Vd4 < 60; the refractive index Nd5 and Abbe number Vd5 of the material of the fifth lens 5 satisfy: 1.75 < Nd5 < 1.85, 36 < Vd5 < 48; the refractive index Nd6 and Abbe number Vd6 of the material of the sixth lens 6 satisfy: 1.8 < Nd6 < 1.9, 32 < Vd6 < 43; the refractive index Nd7 and Abbe number Vd7 of the material of the seventh lens 7 satisfy: 1.88 < Nd7 < 2, 16 < Vd7 < 26; the refractive index Nd8 and Abbe number Vd8 of the material of the eighth lens 8 satisfy: 1.7 < Nd8 < 1.82, 21 < Vd8 < 33; the refractive index Nd9 and Abbe number Vd9 of the material of the ninth lens 9 satisfy: 1.8 < Nd9 < 1.9, 40 < Vd9 < 55; the refractive index Nd10 and Abbe number Vd10 of the material of the tenth lens 10 satisfy: 1.7 < Nd10 < 1.9, 22 < Vd10 < 34; the refractive index Nd11 and Abbe number Vd11 of the material of the eleventh lens 11 satisfy: 1.75 < Nd11 < 1.95, 20 < Vd11 < 36; the refractive index Nd12 and Abbe number Vd12 of the material of the twelfth lens 12 satisfy: 1.7 < Nd12 < 1.88, 42 < Vd12 < 55; the refractive index Nd13 and Abbe number Vd13 of the material of the thirteenth lens 13 satisfy: 1.78 < Nd13 < 1.9, 23 < Vd13 < 32; the refractive index Nd14 and Abbe number Vd14 of the material of the fourteenth lens 14 satisfy: 1.8 < Nd14 < 1.95, 32 < Vd14 < 48; the refractive index Nd15 and Abbe number Vd15 of the material of the fifteenth lens 15 satisfy: 1.65 < Nd15 < 1.83, 37 < Vd15 < 52.

[0062] By adopting the above values for the refractive index and Abbe number of each lens in the medium and long focal length full-frame large magnification anamorphic lens, it conforms to the mathematical relationship of the focal length distribution of each lens.

[0063] In this embodiment, the actual parameters of each lens are shown in Table 1 and Table 2. Table 1 shows partial parameters of the first lens 1 to the fifteenth lens 15, and Table 2 shows other parameters of the fifteenth lens 15.

[0064]

[0065]

[0066]

[0067] Table 1

[0068] K -7.90E+00 7.97E+00 A4 -1.00E-04 -6.04E-05 A6 -5.58E-07 -5.61E-07 A8 8.48E-10 4.71E-09 A10 -3.44E-13 -6.12E-12

[0069] Table 2

[0070] like Figure 1 and Figure 4 ,as well as Figure 2 and Figure 5 As shown, in this embodiment of the invention, the second lens 2 can move along the optical axis between the first lens 1 and the third lens 3 for focusing. Since the second lens 2 is internally focused, the overall length of the lens can remain constant when adjusting the focal length. At the same time, the floating internal focusing group can achieve focusing from the object-image distance from 0.9m to infinity, while overcoming the technical difficulties of large breathing effect and inconsistent magnification of 75mm anamorphic lenses.

[0071] See Figure 3 As shown, the distortion is less than 1%, ensuring that the image shows minimal distortion.

[0072] See Figure 6 As shown, the distortion is less than 1%, ensuring that the image shows a small deformation, which is consistent with the COOK widening imaging style.

[0073] In this embodiment of the invention, a filter (not shown in the figure) is provided at the front end of the telephoto full-frame high-magnification anamorphic lens, and the filter diameter ranges from 58mm to 62mm. Preferably, the filter diameter is 62mm. Because a filter is provided at the front end of the telephoto full-frame high-magnification anamorphic lens, it can filter out stray light and improve image quality.

[0074] In this embodiment of the invention, the focal length of the telephoto full-frame high-magnification anamorphic lens in the Y direction is 73mm to 77mm, and the zoom ratio of the telephoto full-frame high-magnification anamorphic lens is 1.4X to 1.8X; more specifically, the focal length of the telephoto full-frame high-magnification anamorphic lens in the Y direction is 75mm, the zoom ratio is 1.6X, and the weight is less than 463g.

[0075] In this embodiment of the invention, the aperture stop STO is located between the eighth lens 8 and the ninth lens 9.

[0076] In this embodiment of the invention, each lens in the first lens group 100, the second lens group 200, the third lens group 300, and the fourth lens group 400 may be, but is not limited to, optical glass lenses, and the aspherical lenses may be, but is not limited to, high-precision glass aspherical surfaces. Because each lens in the first lens group 100, the second lens group 200, the third lens group 300, and the fourth lens group 400 uses optical glass lenses, and the aspherical lenses use high-precision glass aspherical surfaces, they have the advantages of wide temperature adaptability, simple structure, low processing difficulty, easy storage, and low production cost.

[0077] It should be noted that this telephoto 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.

[0078] 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.

[0079] 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 medium-to-long telephoto full-frame high-magnification anamorphic lens, characterized in that: It consists of 15 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 and a second lens arranged sequentially along the optical axis from the object plane to the image plane, wherein the first lens and the second lens are spherical lenses; The second lens group includes a third lens, a fourth lens, and a fifth lens arranged sequentially along the optical axis from the object plane to the image plane, wherein the third lens, the fourth lens, and the fifth lens are cylindrical lenses; The third lens group includes a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, and a twelfth lens arranged sequentially along the optical axis from the object plane to the image plane. The sixth lens, the seventh lens, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, and the twelfth lens are spherical lenses. The fourth lens group includes a thirteenth lens and a fourteenth lens arranged sequentially from the object plane to the image plane along the optical axis, wherein the thirteenth lens and the fourteenth lens are cylindrical lenses; The aspherical lens is defined as the fifteenth lens; The focal length distribution of each lens in this medium-long telephoto full-frame high-magnification anamorphic lens meets the following conditions: 73mm <f(1~15)Y<77mm; 44mm <f(1~15)X<49mm; 1.55 <f(1~15)Y / f(1~15)X<1.65; 0.2 <f(2)Y / f(1~8)Y<0.7; 7.8 <f(1~2)Y / f(3~8)Y<23.3; 0.4 <f(1~8)X / f(9~15)X<1.2; 0.5 <f(1~8)Y / f(9~15)Y<1.5; Wherein, the curvature direction of the third 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≤15; The optical power of the first lens is negative, and the optical power of the second lens is positive. The third and fourth lenses have negative optical power, while the fifth lens has positive optical power. The optical power of the sixth lens, the seventh lens, the ninth lens, and the twelfth lens is positive, while the optical power of the eighth lens, the tenth lens, and the eleventh lens is negative. The optical power of the thirteenth lens is positive, and the optical power of the fourteenth lens is negative.

2. The medium-long telephoto full-frame high-magnification anamorphic lens according to claim 1, characterized in that, The seventh lens and the eighth lens are cemented together to form a cemented doublet spherical lens one; the ninth lens and the tenth lens are cemented together to form a cemented doublet spherical lens two.

3. The medium-long telephoto full-frame high-magnification anamorphic lens according to claim 1, characterized in that, The fourth lens and the fifth lens are cemented together to form a cemented doublet cylindrical lens one; the thirteenth lens and the fourteenth lens are cemented together to form a cemented doublet cylindrical lens two.

4. The medium-long telephoto 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: 1.7 <Nd1<1.8,42<Vd1<55; The refractive index Nd2 and Abbe constant Vd2 of the material of the second lens satisfy: 1.5 <Nd2<1.66,42<Vd2<60; The refractive index Nd3 and Abbe constant Vd3 of the material of the third lens satisfy: 1.75 <Nd3<1.85,34<Vd3<46; The refractive index Nd4 and Abbe constant Vd4 of the material of the fourth lens satisfy: 1.5 <Nd4<1.68,50<Vd4<60; The refractive index Nd5 and Abbe constant Vd5 of the fifth lens satisfy: 1.75 <Nd5<1.85,36<Vd5<48; The refractive index Nd6 and Abbe constant Vd6 of the material of the sixth lens satisfy: 1.8 <Nd6<1.9 ,32<Vd6<43; The refractive index Nd7 and Abbe constant Vd7 of the seventh lens satisfy: 1.88 <Nd7<2,16<Vd7<26; The refractive index Nd8 and Abbe constant Vd8 of the material of the eighth lens satisfy: 1.7 <Nd8<1.82,21<Vd8<33; The refractive index Nd9 and Abbe constant Vd9 of the material of the ninth lens satisfy: 1.8 <Nd9<1.9,40<Vd9<55; The refractive index Nd10 and Abbe constant Vd10 of the tenth lens satisfy: 1.7 <Nd10<1.9,22<Vd10<34; The refractive index Nd11 and Abbe constant Vd11 of the eleventh lens satisfy: 1.

75. <Nd11<1.95,20<Vd11<36; The refractive index Nd12 and Abbe constant Vd12 of the material of the twelfth lens satisfy: 1.7 <Nd12<1.88,42<Vd12<55; The refractive index Nd13 and Abbe constant Vd13 of the thirteenth lens satisfy the following condition: 1.

78. <Nd13<1.9,23<Vd13<32; The refractive index Nd14 and Abbe constant Vd14 of the material of the fourteenth lens satisfy: 1.8 <Nd14<1.95,32<Vd14<48; The refractive index Nd15 and Abbe constant Vd15 of the fifteenth lens satisfy: 1.

65. <Nd15<1.83,37<Vd15<52。 5. The medium-long telephoto full-frame high-magnification anamorphic lens according to claim 1, characterized in that, The second lens can move along the optical axis between the first lens and the third lens to focus.

6. The medium-long telephoto full-frame high-magnification anamorphic lens according to claim 1, characterized in that, The front end of the telephoto full-frame high-magnification anamorphic lens is equipped with a filter, and the filter aperture ranges from 58mm to 62mm.

7. The medium-long telephoto full-frame high-magnification anamorphic lens according to claim 1, characterized in that, The medium telephoto full-frame high-magnification anamorphic lens has a focal length of 73mm to 77mm in the Y direction, and / or the zoom ratio of the medium telephoto full-frame high-magnification anamorphic lens is 1.4X to 1.8X; and / or the aperture STO of the medium telephoto full-frame high-magnification anamorphic lens is located between the eighth lens and the ninth lens.

8. The medium-long telephoto 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.

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