Anamorphic lens
Patent Information
- Application Number
- DE202025103991
- Authority / Receiving Office
- DE · DE
- Patent Type
- Utility models
- Current Assignee / Owner
- Priority Date
- 2025-06-19
- Filing Date
- 2025-07-11
- Publication Date
- 2025-09-25
- Estimated Expiration
- 2035-07-31
Smart Images
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Abstract
Description
Technical area
[0001] The present utility model relates to the technical field of optical lenses, in particular a lens. Background technology
[0002] With the rapid development of internet technology, taking photos and videos has become an indispensable part of everyday life for ordinary consumers. In recent years, with the advancement of 5G and other technologies, more and more videos such as vlogs have been shared, and more and more people are using mobile phones, cameras, and other tools to shoot short films and microfilms.
[0003] However, the conventional shooting ratio of mobile phones, tablets, cameras, and other devices currently on the market is 16:9, while the ratio of cinematic widescreen video is 2.4:1. At the same time, good microfilm or video recording requires the cooperation of lenses with different focal lengths, especially for close-up shots of people, which require anamorphic medium-telephoto lenses.
[0004] Existing anamorphic lenses have technical problems such as high price, large volume and weight, strong breathing effect and unstable magnification, and there are almost no full-frame anamorphic lenses with autofocus on the market. Content of the utility model
[0005] Therefore, the technical problem to be solved by the present utility model is to overcome the technical problems of the prior art anamorphic lenses, such as high price, large volume and weight, strong breathing effect and unstable magnification, so as to provide an anamorphic lens.
[0006] To achieve the above-mentioned purpose, the present utility model offers the following technical solutions: An anamorphic lens comprising a first spherical lens group, a first cylindrical lens group, a second spherical lens group, a third spherical lens group, a fourth spherical lens group, a second cylindrical lens group, and a fifth lens group arranged one behind the other along the optical path from the object side to the image side; the first spherical lens group has a positive focal power, the first cylindrical lens group has a negative focal power, the second spherical lens group has a positive focal power, the third spherical lens group has a positive focal power, the fourth spherical lens group has a negative focal power, the second cylindrical lens group has a negative focal power, and the fifth lens group has a positive focal power; the comprehensive optical focal length of all lens groups meets the following conditions: 1.2 <f(G1−G7)Y / f(G1−G7)X<1,8; −2.0 <f(G2)X / f(G1−G3)X<−1,2; −1.5 <f(G6)Y / f(G4−G7)Y<−0,7; 0.2 <f(G7)Y / f(G4−G7)Y<1,0; 1.2 <f(G1−G3)X / f(G4−G7)X<2,3; where the direction of curvature of the first cylindrical lens group is the X direction and the Y direction is the direction perpendicular to the X direction; f(G1-G7)Y is the comprehensive optical focal length of the first spherical lens group to the fifth lens group along the Y direction, f(G1-G7)X is the comprehensive optical focal length of the first spherical lens group to the fifth lens group along the X direction, f(G2)X is the comprehensive optical focal length of the first cylindrical lens group along the X direction and f(G1-G3)X is the comprehensive optical focal length of the first spherical lens group to the second spherical lens group along the X direction, f(G6)Y is the comprehensive optical focal length of the second cylindrical lens group along the Y direction, f(G7)Y is the comprehensive optical focal length of the fifth lens group along the Y direction,f(G4-G7)Y is the comprehensive optical focal length of the third spherical lens group to the fifth lens group (G4) along the Y direction, and f(G4-G7)X is the comprehensive optical focal length of the third spherical lens group (G4) to the fifth lens group along the X direction.
[0007] Furthermore, the first spherical lens group comprises a first lens, a second lens, and a third lens arranged one behind the other along the optical path from the object side to the image side; wherein the first lens is a spherical lens with negative refractive power, the second lens is a spherical lens with negative refractive power, and the third lens is a spherical lens with positive refractive power; the first cylindrical lens group comprises a fourth lens, a fifth lens, and a sixth lens arranged one behind the other along the optical path from the object side to the image side; wherein the fourth lens is a cylindrical lens with negative refractive power, the fifth lens is a cylindrical lens with negative refractive power, and the sixth lens is a cylindrical lens with positive refractive power; the second spherical lens group comprises a seventh lens and an eighth lens arranged one behind the other along the optical path from the object side to the image side; the seventh lens being a spherical lens with negative refractive power and the eighth lens being a spherical lens with positive refractive power; the third spherical lens group comprises a ninth lens and a tenth lens arranged one behind the other along the optical path from the object side to the image side; the ninth lens being a spherical lens with positive refractive power and the tenth lens being a spherical lens with negative refractive power; the fourth spherical lens group comprises an eleventh lens arranged one behind the other along the optical path from the object side to the image side; the eleventh lens being a spherical lens with negative refractive power; the second cylindrical lens group comprises a twelfth lens arranged along the optical path from the object side to the image side; the twelfth lens being a cylindrical lens with negative refractive power; the fifth lens group comprises a thirteenth lens, a fourteenth lens, a fifteenth lens, a sixteenth lens, a seventeenth lens, and an eighteenth lens arranged along the optical path from the object side to the image side; wherein the thirteenth lens is a spherical lens with positive refractive power, the fourteenth lens is a spherical lens with negative refractive power, the fifteenth lens is a spherical lens with negative refractive power, the sixteenth lens is a spherical lens with positive refractive power, the seventeenth lens is a spherical lens with positive refractive power, and the eighteenth lens is an aspherical lens with negative refractive power.
[0008] In addition, the eleventh lens forms an inner focusing group.
[0009] Furthermore, the fifth lens and the sixth lens are bonded to form a double-cemented cylindrical lens; and / or the ninth lens and the tenth lens are bonded to form a double-cemented spherical lens; and / or the thirteenth lens and the fourteenth lens are bonded to form a double-cemented spherical lens; and / or the fifteenth lens and the sixteenth lens are bonded to form a double-cemented spherical lens.
[0010] In addition, the comprehensive optical focal length of the anamorphic lens in the Y direction is 48 mm.
[0011] In addition, the zoom factor of the anamorphic lens is 1.33x and the image scale remains constant at different object distances.
[0012] In addition, the total optical length of the anamorphic lens does not exceed 145 mm.
[0013] In addition, the aperture value of the anamorphic lens does not exceed 2.
[0014] In addition, the lenses in the first spherical lens group, the first cylindrical lens group, the second spherical lens group, the third spherical lens group, the fourth spherical lens group, the second cylindrical lens group, and the fifth lens group are all optical glass lenses.
[0015] The technical solution of the present utility model offers the following advantages: By combining the cylindrical lens group and the spherical lens group in the X direction, the optical focal power is reasonably distributed, making the optical structure of the anamorphic lens more compact and smaller, and reducing costs. The spherical lens group performs comprehensive light correction. Then, the optical properties of the cylindrical lens group are used to "compress" the horizontally incident light while keeping the vertically incident light unchanged, thereby increasing the angle of view of the lens for horizontal shooting and ensuring performance in the X direction. Then, the cylindrical lens group and the spherical lens group in the Y direction stabilize the performance in the other direction. This achieves a full-frame and high-magnification lens.In addition, the compact design of the integrated cylindrical and spherical lens group ensures small dimensions and light weight of the lens, which significantly reduces costs, and the aspherical lens effectively corrects the spherical aberration and astigmatism of the lens, thus improving the resolution while reducing its size and weight. Figures
[0016] To more clearly illustrate the specific embodiments of the present utility model and the technical solutions in the prior art, the figures required for use in the specific embodiments and the description of the prior art are briefly presented below. Obviously, the figures described below represent some embodiments of the present utility model. For general technical personnel in this field, additional figures can be created based on these figures without any creative effort. Fig. 1 is an optical structure diagram of the anamorphic lens in the X direction at infinite object-image distance in the embodiment of the present utility model. Fig.2 is an optical structure diagram of the anamorphic lens in the Y direction at infinite object-image distance in the embodiment of the present utility model. Fig. 3 shows the spherical aberration diagram, the field curvature diagram and the distortion diagram of the anamorphic lens in the embodiment of the present utility model at infinite object-image distance. Fig. 4 is an optical structure diagram of the anamorphic lens in the X direction at an object-image distance of 0.5 m in the embodiment of the present utility model. Fig. 5 is an optical structure diagram of the anamorphic lens in the Y direction at an object-image distance of 0.5 m in the embodiment of the present utility model. Fig.6 shows the spherical aberration diagram, the field curvature diagram and the distortion diagram of the anamorphic lens in the embodiment of the present utility model at an object-image distance of 0.5 m.
[0017] Reference symbols in the figures: G1. first spherical lens group; G2. first cylindrical lens group; G3. second spherical lens group; G4. third spherical lens group; G5. fourth spherical lens group; G6. second cylindrical lens group; G7. fifth spherical lens group; 1. first lens; 2. second lens; 3. third lens; 4. fourth lens; 5. fifth lens; 6. sixth lens; 7. seventh lens; 8. eighth lens; 9. ninth lens; 10. tenth lens; 11. eleventh lens; 12. twelfth lens; 13. thirteenth lens; 14. fourteenth lens; 15. fifteenth lens; 16. sixteenth lens; 17. seventeenth lens; 18. eighteenth lens. Specific embodiments
[0018] In the following, the technical solutions in the embodiments of the present utility model will be described clearly and completely with reference to the accompanying drawings. Obviously, the described embodiments are only some of the embodiments of the present utility model and not all of the embodiments. Based on the embodiments of the present utility model, all other embodiments that general technical personnel can obtain without creative effort fall within the scope of the present utility model.
[0019] When describing the present utility model, it should be understood that azimuth or positional relationships referring to the terms "center," "top," "bottom," "left," "right," "vertical," "horizontal," "inside," "outside," etc., have the azimuth or positional relationships based on the figures. They are intended to facilitate and simplify the description of the present utility model, rather than indicating or implying that the said device or component must have a specific orientation, be constructed, and operate in a specific orientation. Therefore, they should not be understood as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used only for differentiated description and should not be understood to indicate a relative meaning.
[0020] As in the Fig.1 to 6, an anamorphic lens comprises a first spherical lens group G1, a first cylindrical lens group G2, a second spherical lens group G3, a third spherical lens group G4, a fourth spherical lens group G5, a second cylindrical lens group G6 and a fifth lens group G7, which are arranged one behind the other along the optical path from the object side to the image side; wherein the first spherical lens group G1 has a positive focal power, the first cylindrical lens group G2 has a negative focal power, the second spherical lens group G3 has a positive focal power, the third spherical lens group G4 has a positive focal power, the fourth spherical lens group G5 has a negative focal power, the second cylindrical lens group G6 has a negative focal power and the fifth lens group G7 has a positive focal power.
[0021] The comprehensive optical focal length of all lens groups meets the following conditions: 1.2 <f(G1−G7)Y / f(G1−G7)X<1,8; −2,0<f(G2)X / f(G1−G3)X<−1,2; −1,5<f(G6)Y / f(G4−G7)Y<−0,7; 0,2<f(G7)Y / f(G4−G7)Y<1,0; 1,5<f(G1−G3)X / f(G4−G7)X<2,3; where the curvature direction of the first cylindrical lens group G2 is the X direction and the Y direction is the direction perpendicular to the X direction; f(G1-G7)Y is the comprehensive optical focal length of the first spherical lens group G1 to the fifth lens group G7 along the Y direction, f(G1-G7)X is the comprehensive optical focal length of the first spherical lens group G1 to the fifth lens group G7 along the X direction, f(G2)X is the comprehensive optical focal length of the first cylindrical lens group G2 along the X direction and f(G1-G3)X is the comprehensive optical focal length of the first spherical lens group G1 to the second spherical lens group G3 along the X direction, f(G6)Y is the comprehensive optical focal length of the second cylindrical lens group G6 along the Y direction, f(G7)Y is the comprehensive optical focal length of the fifth lens group G7 along the Y direction,f(G4-G7)Y is the comprehensive optical focal length of the third spherical lens group G4 to the fifth lens group G7 along the Y direction, and f(G4-G7)X is the comprehensive optical focal length of the third spherical lens group G4 to the fifth lens group G7 along the X direction.
[0022] This anamorphic lens combines the X-axis cylindrical lens group with the spherical lens group to sensibly distribute optical power, making the optical structure of the anamorphic lens more compact and smaller, while reducing costs. The spherical lens group performs comprehensive light correction. The optical properties of the cylindrical lens group are then used to "compress" the horizontally incident light while keeping the vertically incident light unchanged, thereby expanding the lens's angle of view for horizontal shooting and ensuring performance in the X-axis direction. The cylindrical lens group and the Y-axis spherical lens group then stabilize the performance in the other direction, thus achieving a full-frame, high-magnification lens.In addition, the compact design of the integrated cylindrical and spherical lens group ensures small dimensions and light weight of the lens, which significantly reduces costs, and the aspherical lens effectively corrects the spherical aberration and astigmatism of the lens, thus improving the resolution while reducing its size and weight.
[0023] In some embodiments of the present embodiment, the first spherical lens group G1 comprises a first lens 1, a second lens 2, and a third lens 3 arranged one behind the other along the optical path from the object side to the image side; the first lens 1 is a spherical lens with negative refractive power, the second lens 2 is a spherical lens with negative refractive power, and the third lens 3 is a spherical lens with positive refractive power.
[0024] The first cylindrical lens group G2 comprises a fourth lens 4, a fifth lens 5, and a sixth lens 6, which are arranged one behind the other along the optical path from the object side to the image side; the fourth lens 4 is a cylindrical lens with negative refractive power, the fifth lens 5 is a cylindrical lens with negative refractive power, and the sixth lens 6 is a cylindrical lens with positive refractive power.
[0025] The second spherical lens group G3 comprises a seventh lens 7 and an eighth lens 8, which are arranged one behind the other along the optical path from the object side to the image side; the seventh lens 7 is a spherical lens with negative refractive power, and the eighth lens 8 is a spherical lens with positive refractive power.
[0026] The third spherical lens group G4 comprises a ninth lens 9 and a tenth lens 10 arranged one behind the other along the optical path from the object side to the image side; the ninth lens 9 is a spherical lens with positive refractive power, and the tenth lens 10 is a spherical lens with negative refractive power.
[0027] The fourth spherical lens group G5 comprises an eleventh lens 11 arranged one behind the other along the optical path from the object side to the image side; the eleventh lens 11 is a spherical lens with negative refractive power.
[0028] The second cylindrical lens group G6 includes a twelfth lens 12 arranged along the optical path from the object side to the image side; the twelfth lens 12 is a cylindrical lens with negative refractive power;
[0029] The fifth lens group G7 includes a thirteenth lens 13, a fourteenth lens 14, a fifteenth lens 15, a sixteenth lens 16, a seventeenth lens 17, and an eighteenth lens 18, arranged along the optical path from the object side to the image side. The thirteenth lens 13 is a spherical lens with positive refractive power, the fourteenth lens 14 is a spherical lens with negative refractive power, the fifteenth lens 15 is a spherical lens with negative refractive power, the sixteenth lens 16 is a spherical lens with positive refractive power, the seventeenth lens 17 is a spherical lens with positive refractive power, and the eighteenth lens 18 is an aspherical lens with negative refractive power.
[0030] The focal length distribution of the first lens 1 to the eighteenth lens 18 satisfies the following relationship: 1.2 <f(1-18) Y / f(1-18)X<1,8; −2.0 <f(4−6)X / f(1−8)X<−1,2; −1.5 <f(12)Y / f(9−18)Y<−0,7; 0.2 <f(13−18)Y / f(9−18)Y<1,0; 1.5 <f(1−8)X / f(9−18)X<2,3; where the curvature direction of the fourth lens 4 is the X direction and the Y direction is the direction perpendicular to the X direction; f((mn)Y is the comprehensive optical focal length from the m-th lens to the n-th lens along the Y direction and f((mn)X is the comprehensive optical focal length from the m-th lens to the n-th lens along the X direction, and m and n are both positive integers, with 1≤m < n≤18. In some embodiments of the present embodiment, the focal length distribution of the first lens 1 to the eighteenth lens 18 satisfies the following conditions: f(1−18)Y / f(1−18)X=1.34; f(4−6)X / f(1−8)X=−1.73; f(12)Y / f(9−18)Y=−1.25; f(13−18)Y / f(9−18)Y=0.51; f(1−8)X / f(9−18)X=1.82.
[0031] In some embodiments of the present embodiment, the number of lenses in the anamorphic lens is not limited to 18 lenses, and the number of lenses in the anamorphic lens can be further changed as long as the comprehensive optical focal lengths of respective lens groups in the anamorphic lens satisfy the above mathematical relationship.
[0032] In this example, the total optical focal length of the anamorphic lens in the Y direction is 48 mm. The zoom factor of the anamorphic lens is 1.33x, and the magnification remains constant at different object distances. The total optical length of the anamorphic lens does not exceed 145 mm. The aperture F of the anamorphic lens does not exceed 2.
[0033] In this embodiment, the eleventh lens element 11 forms an inner focusing group. The overall length of the lens remains unchanged during adjustment. A floating inner focusing group enables focusing from 0.5 m to infinity in the object-to-image distance. At the same time, the technical difficulties of the strong breathing effect and inconsistent magnification of the 48 mm anamorphic lens are overcome.
[0034] In this embodiment, the fifth lens 5 and the sixth lens 6 are bonded to form a double-cemented cylindrical lens; the ninth lens 9 and the tenth lens 10 are bonded to form a double-cemented spherical lens; the thirteenth lens 13 and the fourteenth lens 14 are bonded to form a double-cemented spherical lens; the fifteenth lens 15 and the sixteenth lens 16 are bonded to form a double-cemented spherical lens.
[0035] It should be noted that the above-mentioned multiple groups of doubly cemented spherical lenses are joined by bonding. As an alternative embodiment, based on the concept of the present utility model, in order to distinguish it from the present application, the above-mentioned joining method is changed, for example, by bonding, one-piece molding, and other joining methods, and then the shape of the lens is adaptively changed after joining, which should also be included in the scope of the present application. For a single lens or two consecutive lenses with the same focal length sign, a single lens can be divided into two or more lenses, and two consecutive lenses with the same sign can be combined into one lens. Such simple transformations of the optical structure of the patent, such asThe transformed optical power distribution of the lens or lens group is within the scope of the mathematical relationship expression of the patent. Based on this embodiment, any modifications and substitutions made to the number of lenses and the combination method to distinguish it from the present application fall within the scope of this application without deviating from the gist of the present application.
[0036] In this embodiment, the lenses in the first spherical lens group G1, the first cylindrical lens group G2, the second spherical lens group G3, the third spherical lens group G4, the fourth spherical lens group G5, the second cylindrical lens group G6, and the fifth lens group G7 are all optical glass lenses.
[0037] Fig.Figure 3 shows the spherical aberration diagram, the field curvature diagram, and the distortion diagram of the anamorphic lens. From the curve in the figure, it can be seen that the spherical aberration is basically less than ±0.5 to ensure the clarity of the image center; the field curvature is also less than ±0.5 to ensure the clarity of the large image field; and the distortion is less than 10% to ensure slight distortion in the image area.
[0038] Fig. 4 and Fig. 5 show that the inner focusing group in the anamorphic lens is adjusted and the overall length of the anamorphic lens remains unchanged to realize an extremely small object-to-image distance of 0.5 m for the high-magnification anamorphic lens in full frame.
[0039] Fig.Figure 6 shows the spherical aberration diagram, the field curvature diagram, and the distortion diagram of the anamorphic lens at a short object distance. From the curve in the figure, it can be seen that the spherical aberration is generally less than ±0.5 to ensure the clarity of the image center; the field curvature is also less than ±0.5 to ensure the clarity of the large image field; and the distortion is less than 10% to ensure slight distortion in the image area.
[0040] The following Table 1 lists the actual parameters of each lens of this embodiment, which correspond to the mathematical relationships mentioned above: Table 1 lens Surface shape X-radius (mm) Y-radius (mm) Thickness (mm) refractive index Abbe number First lens Spherical surface -120,63 -120.63 1,8 1,78 47,5 Spherical 234,25 234,25 9,89 Second lens Spherical 94,43 94,43 1,8 1,81 27,5 Spherical 42,71 42,71 4,62 Third lens Spherical 61,77 61,77 6,46 2,01 18,0 Spherical -159 -159 2,27 Fourth lens Cylindrical -98,41 inf 2 1,55 94,7 Cylindrical 58,1 inf 3,27 Fifth lens Cylindrical inf inf 2 1,81 25,4 Sixth lens Cylindrical 47,2 inf 7,29 1,99 25,5 Cylindrical -338,8 inf 2,19 Seventh lens Spherical -60,47 -60,47 2 1,75 25,1 Spherical 72,68 72,68 3,71 Eighth lens Spherical 109,63 109,63 4,42 2,01 18,1 Spherical -56,146 -56,146 1,1 aperture Spherical inf inf 1,1 Ninth lens Spherical 35,47 35,47 5,67 1,59 68,3 Tenth lens Spherical -66,23 -66,23 1,4 1,95 17,9 Spherical inf inf 1,4 Eleventh lens Spherical 151,56 151,56 1,4 1,49 94,7 Spherical 24,1 24,1 10,15 Twelfth lens Cylindrical inf -500 2 1,65 94,7 Cylindrical inf 88,045 0,3 ThirteenthLens Spherical 32,981 32,981 5,25 Fourteenth Lens Spherical -64,682 -64,682 1,4 1,75 52,3 Spherical 48,977 48,977 4,21 1,87 19,1 FifteenthLens Spherical -37,5898 -37,5898 1,4 Sixteenth lens Spherical 33,499 33,499 6,98 1,75 25,1 Spherical -51,88 -51,88 0,12 1,73 77,1 Seventeenth Lens Spherical 55 55 6,39 Spherical -70 -70 2,68 15,51 68,51 Eighteenth Lens Aspherical 94,567 94,567 4 Aspherical 32,128 32,128 27,84
[0041] The aspherical coefficients of the eighteenth lens 18 are as follows: Table 2 Eighteenth Lens Area 1 Area 2 A4 4,36E-05 2,86E-05 A6 -9,45E-08 -1,42E-07 A8 1,45E-10 1,85E-09 A10 -1,0562E-11 -1,55E-11
[0042] The anamorphic lens provided by the present utility model adopts an integrated design that enables a small lens size while providing excellent, cost-effective optical performance such as high resolution, low breathing, low distortion, full frame, 1.33x magnification, etc., and it can be designed according to actual usage requirements and is compatible with the bayonet mounts of various camera brands on the market to achieve customized customization and universal cooperation.
[0043] Obviously, the above embodiments are merely examples for clarity of description and do not represent limitations of the embodiments. General technical personnel may make various other forms of changes or modifications based on the above description. An exhaustive list of all embodiments is neither necessary nor possible. The resulting obvious changes or modifications remain within the scope of the present utility model.
Claims
[1] Anamorphic lens, characterized by that it comprises a first spherical lens group (G1), a first cylindrical lens group (G2), a second spherical lens group (G3), a third spherical lens group (G4), a fourth spherical lens group (G5), a second cylindrical lens group (G6) and a fifth lens group (G7), which are arranged one behind the other along the beam path from the object side to the image side; that the first spherical lens group (G1) has a positive focal power, the first cylindrical lens group (G2) has a negative focal power, the second spherical lens group (G3) has a positive focal power, the third spherical lens group (G4) has a positive focal power, the fourth spherical lens group (G5) has a negative focal power, the second cylindrical lens group (G6) has a negative focal power and the fifth lens group (G7) has a positive focal power; that the overall optical focal length of all lens groups meets the following conditions: 1,2<f(G1−G7)Y / f(G1−G7)X<1,8; −2,0<f(G2)X / f(G1−G3)X<−1,2; −1,5<f(G6)Y / f(G4−G7)Y<−0,7; 0,2<f(G7)Y / f(G4−G7)Y<1,0; 1,5<f(G1−G3)X / f(G4−G7)X<2,3; wherein the curvature direction of the first cylindrical lens group (G2) is the X direction and the Y direction is the direction perpendicular to the X direction; f(G1-G7)Y is the comprehensive optical focal length of the first spherical lens group (G1) to the fifth lens group (G7) along the Y direction, f(G1-G7)X is the comprehensive optical focal length of the first spherical lens group (G1) to the fifth lens group (G7) along the X direction, f(G2)X is the comprehensive optical focal length of the first cylindrical lens group (G2) along the X direction, and f(G1-G3)X is the comprehensive optical focal length of the first spherical lens group (G1) to the second spherical lens group (G3) along the X direction, f(G6)Y is the comprehensive optical focal length of the second cylindrical lens group (G6) along the Y direction, f(G7)Y is the comprehensive optical focal length of the fifth lens group (G7) along the Y direction,f(G4-G7)Y is the comprehensive optical focal length of the third spherical lens group (G4) to the fifth lens group (G7) along the Y direction, and f(G4-G7)X is the comprehensive optical focal length of the third spherical lens group (G4) to the fifth lens group (G7) along the X direction. [2] Anamorphic lens according to claim 1, characterized by that the first spherical lens group (G1) comprises a first lens (1), a second lens (2) and a third lens (3) which are arranged one behind the other along the beam path from the object side to the image side; wherein the first lens (1) is a spherical lens with negative refractive power, the second lens (2) is a spherical lens with negative refractive power and the third lens (3) is a spherical lens with positive refractive power; that the first cylindrical lens group (G2) comprises a fourth lens (4), a fifth lens (5), and a sixth lens (6), which are arranged one behind the other along the beam path from the object side to the image side; wherein the fourth lens (4) is a cylindrical lens with negative refractive power, the fifth lens (5) is a cylindrical lens with negative refractive power, and the sixth lens (6) is a cylindrical lens with positive refractive power; that the second spherical lens group (G3) comprises a seventh lens (7) and an eighth lens (8) arranged one behind the other along the beam path from the object side to the image side; wherein the seventh lens (7) is a spherical lens with negative refractive power and the eighth lens (8) is a spherical lens with positive refractive power; that the third spherical lens group (G4) comprises a ninth lens (9) and a tenth lens (10) arranged one behind the other along the beam path from the object side to the image side; wherein the ninth lens (9) is a spherical lens with positive refractive power and the tenth lens (10) is a spherical lens with negative refractive power; that the fourth spherical lens group (G5) comprises an eleventh lens (11) arranged one behind the other along the beam path from the object side to the image side; wherein the eleventh lens (11) is a spherical lens with negative refractive power; that the second cylindrical lens group (G6) comprises a twelfth lens (12) arranged along the beam path from the object side to the image side; wherein the twelfth lens (12) is a cylindrical lens with negative refractive power; that the fifth lens group (G7) comprises a thirteenth lens (13), a fourteenth lens (14), a fifteenth lens (15), a sixteenth lens (16), a seventeenth lens (17) and an eighteenth lens (18) arranged along the beam path from the object side to the image side; wherein the thirteenth lens (13) is a spherical lens with positive refractive power, the fourteenth lens (14) is a spherical lens with negative refractive power, the fifteenth lens (15) is a spherical lens with negative refractive power, the sixteenth lens (16) is a spherical lens with positive refractive power, the seventeenth lens (17) is a spherical lens with positive refractive power and the eighteenth lens (18) is an aspherical lens with negative refractive power. [3] Anamorphic lens according to claim 2, characterized by that the eleventh lens (11) forms an inner focusing group. [4] Anamorphic lens according to claim 2, characterized bythat the fifth lens (5) and the sixth lens (6) are bonded to form a double-cemented cylindrical lens; and / or the ninth lens (9) and the tenth lens (10) are bonded to form a double-cemented spherical lens; and / or the thirteenth lens (13) and the fourteenth lens (14) are bonded to form a double-cemented spherical lens; and / or the fifteenth lens (15) and the sixteenth lens (16) are bonded to form a double-cemented spherical lens. [5] Anamorphic lens according to claim 1, characterized by that the overall optical focal length of the anamorphic lens in the Y direction is 48 mm. [6] Anamorphic lens according to claim 1, characterized by that the zoom factor of the anamorphic lens is 1.33x and the image scale remains constant at different object distances. [7] Anamorphic lens according to claim 1, characterized bythat the total optical length of the anamorphic lens does not exceed 145 mm. [8] Anamorphic lens according to claim 1, characterized by that the aperture value of the anamorphic lens does not exceed 2. [9] Anamorphic lens according to claim 1, characterized by that the lenses in the first spherical lens group (G1), the first cylindrical lens group (G2), the second spherical lens group (G3), the third spherical lens group (G4), the fourth spherical lens group (G5), the second cylindrical lens group (G6) and the fifth lens group (G7) are all optical glass lenses.