Deformable lens

Abstract

The utility model discloses a deformable lens, which belongs to the field of optical lenses and comprises 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 which are sequentially arranged from an object space to an image space. The focal lengths of all the lens groups meet 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; f (G6) Y / f (G4-G7) Y is greater than-1.5 and less than-0.7; 0.2 < f (G7) Y / f (G4-G7) Y < 1.0; f (G1-G3) X / f (G4-G7) X is greater than 1.5 and less than 2.3. The integrated design is adopted, so that the lens is small in size, and meanwhile, the optical performance of large aperture, high resolution, low respiration, low distortion, 1.33 X deformation ratio and the like is obtained.

Description

Technical Field

[0001] This utility model relates to the field of optical lens technology, specifically to an anamorphic lens. Background Technology

[0002] With the rapid development of internet technology, taking photos and videos has become an indispensable part of ordinary consumers' lives. In recent years, driven by technologies such as 5G, video sharing such as vlogs has increased significantly, and more and more people are using mobile phones, cameras, and other tools to shoot short videos and micro-films.

[0003] However, the standard shooting ratio for mobile phones, tablets, cameras, and other devices on the market is 16:9, while the ratio for cinematic widescreen videos is 2.4:1. Furthermore, good short films or videos require lenses of different focal lengths working together, especially medium to long telephoto anamorphic lenses for close-ups of people.

[0004] Existing anamorphic lenses suffer from technical problems such as high price, large size and weight, large breathing effect and inconsistent magnification, and there are currently almost no autofocus full-frame anamorphic lenses on the market. Utility Model Content

[0005] Therefore, the technical problem to be solved by this utility model is to overcome the technical problems of existing anamorphic lenses, such as high price, large size and weight, large breathing effect and inconsistent magnification, so as to provide an anamorphic lens.

[0006] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0007] An anamorphic lens includes 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 sequentially along the optical path from the object side to the image side.

[0008] The first spherical lens group has positive optical power, the first cylindrical lens group has negative optical power, the second spherical lens group has positive optical power, the third spherical lens group has positive optical power, the fourth spherical lens group has negative optical power, the second cylindrical lens group has negative optical power, and the fifth lens group has positive optical power.

[0009] The combined optical focal length of all lens groups satisfies the following condition:

[0010] 1.2<f(G1-G7)Y / f(G1-G7)X<1.8;

[0011] -2.0<f(G2)X / f(G1-G3)X<-1.2;

[0012] -1.5<f(G6)Y / f(G4-G7)Y<-0.7;

[0013] 0.2<f(G7)Y / f(G4-G7)Y<1.0;

[0014] 1.5<f(G1-G3)X / f(G4-G7)X<2.3;

[0015] Wherein, the curvature direction of the first cylindrical lens group is the X direction, and the Y direction is the direction perpendicular to X; f(G1-G7)Y is the combined optical focal length along the Y direction of the first spherical lens group to the fifth lens group, f(G1-G7)X is the combined optical focal length along the X direction of the first spherical lens group to the fifth lens group, f(G2)X is the combined optical focal length along the X direction of the first cylindrical lens group, f(G1-G3)X is the combined optical focal length along the X direction of the first spherical lens group to the second spherical lens group, f(G6)Y is the combined optical focal length along the Y direction of the second cylindrical lens group, f(G7)Y is the combined optical focal length along the Y direction of the fifth lens group, f(G4-G7)Y is the combined optical focal length along the Y direction of the third spherical lens group (G4) to the fifth lens group, and f(G4-G7)X is the combined optical focal length along the X direction of the third spherical lens group (G4) to the fifth lens group.

[0016] Furthermore, the first spherical lens group includes a first lens, a second lens, and a third lens arranged sequentially from the object side to the image side along the optical path; the first lens is a spherical lens with negative optical power, the second lens is a spherical lens with negative optical power, and the third lens is a spherical lens with positive optical power.

[0017] The first cylindrical lens group includes a fourth lens, a fifth lens, and a sixth lens arranged sequentially from the object side to the image side along the optical path; the fourth lens is a cylindrical lens with negative optical power, the fifth lens is a cylindrical lens with negative optical power, and the sixth lens is a cylindrical lens with positive optical power.

[0018] The second spherical lens group includes a seventh lens and an eighth lens arranged sequentially from the object side to the image side along the optical path. The seventh lens is a spherical lens with negative optical power, and the eighth lens is a spherical lens with positive optical power.

[0019] The third spherical lens group includes a ninth lens and a tenth lens arranged sequentially from the object side to the image side along the optical path; the ninth lens is a spherical lens with positive optical power, and the tenth lens is a spherical lens with negative optical power.

[0020] The fourth spherical lens group includes an eleventh lens arranged sequentially from the object side to the image side along the optical path; the eleventh lens is a spherical lens with negative optical power.

[0021] The second cylindrical lens group includes a twelfth lens arranged sequentially from the object side to the image side along the optical path; the twelfth lens is a cylindrical lens with negative optical power;

[0022] The fifth lens group includes a thirteenth lens, a fourteenth lens, a fifteenth lens, a sixteenth lens, a seventeenth lens, and an eighteenth lens arranged sequentially from the object side to the image side along the optical path; the thirteenth lens is a spherical lens with positive optical power, the fourteenth lens is a spherical lens with negative optical power, the fifteenth lens is a spherical lens with negative optical power, the sixteenth lens is a spherical lens with positive optical power, the seventeenth lens is a spherical lens with positive optical power, and the eighteenth lens is an aspherical lens with negative optical power.

[0023] Furthermore, the eleventh lens constitutes an inner focusing group.

[0024] Furthermore, the fifth lens and the sixth lens are cemented together to form a cemented doublet cylindrical lens; and / or, the ninth lens and the tenth lens are cemented together to form a cemented doublet spherical lens; and / or, the thirteenth lens and the fourteenth lens are cemented together to form a cemented doublet spherical lens; and / or, the fifteenth lens and the sixteenth lens are cemented together to form a cemented doublet spherical lens.

[0025] Furthermore, the composite optical focal length of the anamorphic lens in the Y direction is 48mm.

[0026] Furthermore, the zoom ratio of the anamorphic lens is 1.33X, and the magnification remains constant at different object distances.

[0027] Furthermore, the total optical length of the anamorphic lens does not exceed 145mm.

[0028] Furthermore, the aperture value of the anamorphic lens does not exceed 2.

[0029] Furthermore, 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.

[0030] This utility model's technical solution has the following advantages: By combining cylindrical and spherical lens groups in the X-direction, the optical power is rationally allocated, making the optical structure of the anamorphic lens more compact and smaller, and reducing costs. The spherical lens group comprehensively corrects the light, and the optical characteristics of the cylindrical lens group "compress" horizontally entering light while keeping vertically entering light unchanged, thereby increasing the field of view for horizontal shooting and ensuring performance in the X-direction. The cylindrical and spherical lens groups in the Y-direction then stabilize the performance in the other direction. In this way, full-frame and high magnification are achieved. Furthermore, the compact design of the integrated cylindrical and spherical lenses makes the lens small in size and light in weight, significantly reducing costs. The aspherical lens effectively corrects spherical aberration and astigmatism, improving lens resolution while reducing lens size and weight. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is an optical structure diagram of the anamorphic lens in the X direction when the object-image distance is infinitely far in this embodiment of the present invention;

[0033] Figure 2 This is an optical structure diagram of the anamorphic lens in the Y direction when the object-image distance is infinitely far in this embodiment of the present invention;

[0034] Figure 3 This is a diagram showing the spherical aberration, field curvature, and distortion of the anamorphic lens when the object-image distance is infinitely far in this embodiment of the present invention.

[0035] Figure 4 This is an optical structure diagram of the anamorphic lens in the X direction when the object-image distance is 0.5m in an embodiment of this utility model.

[0036] Figure 5 This is an optical structure diagram of the anamorphic lens in the Y direction when the object-image distance is 0.5m in an embodiment of this utility model.

[0037] Figure 6 This is a diagram showing the spherical aberration, field curvature, and distortion of the anamorphic lens when the object-image distance is 0.5m in an embodiment of this utility model.

[0038] Explanation of reference numerals in the attached diagram: 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;

[0039] 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. Detailed Implementation

[0040] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0041] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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 utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] like Figure 1 - Figure 6 The illustrated anamorphic lens includes 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 arranged sequentially along the optical path from the object side to the image side. The first spherical lens group G1 has positive optical power, the first cylindrical lens group G2 has negative optical power, the second spherical lens group G3 has positive optical power, the third spherical lens group G4 has positive optical power, the fourth spherical lens group G5 has negative optical power, the second cylindrical lens group G6 has negative optical power, and the fifth lens group G7 has positive optical power.

[0043] The combined optical focal length of all lens groups satisfies the following condition:

[0044] 1.2<f(G1-G7)Y / f(G1-G7)X<1.8;

[0045] -2.0<f(G2)X / f(G1-G3)X<-1.2;

[0046] -1.5<f(G6)Y / f(G4-G7)Y<-0.7;

[0047] 0.2<f(G7)Y / f(G4-G7)Y<1.0;

[0048] 1.5<f(G1-G3)X / f(G4-G7)X<2.3;

[0049] Wherein, the curvature direction of the first cylindrical lens group G2 is the X direction, and the Y direction is the direction perpendicular to X; f(G1-G7)Y is the combined 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 combined 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 combined optical focal length of the first cylindrical lens group G2 along the X direction, and f(G1-G3)X is the combined optical focal length of the first spherical lens group G1. f(G6)Y is the combined optical focal length along the X direction of the second spherical lens group G3, f(G7)Y is the combined optical focal length along the Y direction of the second cylindrical lens group G6, f(G7)Y is the combined optical focal length along the Y direction of the fifth lens group G7, f(G4-G7)Y is the combined optical focal length along the Y direction of the third spherical lens group (G4) to the fifth lens group G7, and f(G4-G7)X is the combined optical focal length along the X direction of the third spherical lens group (G4) to the fifth lens group G7.

[0050] This type of anamorphic lens uses a combination of cylindrical and spherical lens groups in the X-direction to rationally distribute optical power, making the optical structure of the anamorphic lens more compact and cost-effective. The spherical lens group comprehensively corrects light rays, while the optical characteristics of the cylindrical lens group "compress" horizontally entering light rays, while keeping vertically entering light rays unchanged, thereby increasing the field of view for horizontal shooting and ensuring performance in the X-direction. The cylindrical and spherical lens groups in the Y-direction then stabilize performance in the other direction. This allows the lens to achieve full-frame and high magnification. Furthermore, the compact design of the integrated cylindrical and spherical lenses makes the lens small in size and light in weight, significantly reducing cost. The aspherical lens effectively corrects spherical aberration and astigmatism, improving lens resolution while reducing size and weight.

[0051] In some embodiments of this example, the first spherical lens group G1 includes a first lens 1, a second lens 2, and a third lens 3 arranged sequentially from the object side to the image side along the optical path; the first lens 1 is a spherical lens with negative optical power, the second lens 2 is a spherical lens with negative optical power, and the third lens 3 is a spherical lens with positive optical power.

[0052] The first cylindrical lens group G2 includes a fourth lens 4, a fifth lens 5, and a sixth lens 6 arranged sequentially from the object side to the image side along the optical path; the fourth lens 4 is a cylindrical lens with negative optical power, the fifth lens 5 is a cylindrical lens with negative optical power, and the sixth lens 6 is a cylindrical lens with positive optical power.

[0053] The second spherical lens group G3 includes a seventh lens 7 and an eighth lens 8 arranged sequentially from the object side to the image side along the optical path. The seventh lens 7 is a spherical lens with negative optical power, and the eighth lens 8 is a spherical lens with positive optical power.

[0054] The third spherical lens group G4 includes a ninth lens 9 and a tenth lens 10 arranged sequentially from the object side to the image side along the optical path; the ninth lens 9 is a spherical lens with positive optical power, and the tenth lens 10 is a spherical lens with negative optical power.

[0055] The fourth spherical lens group G5 includes an eleventh lens 11 arranged sequentially from the object side to the image side along the optical path; the eleventh lens 11 is a spherical lens with negative optical power.

[0056] The second cylindrical lens group G6 includes a twelfth lens 12 arranged sequentially from the object side to the image side along the optical path; the twelfth lens 12 is a cylindrical lens with negative optical power;

[0057] 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 sequentially along the optical path from the object side to the image side. The thirteenth lens 13 is a spherical lens with positive optical power, the fourteenth lens 14 is a spherical lens with negative optical power, the fifteenth lens 15 is a spherical lens with negative optical power, the sixteenth lens 16 is a spherical lens with positive optical power, the seventeenth lens 17 is a spherical lens with positive optical power, and the eighteenth lens 18 is an aspherical lens with negative optical power.

[0058] The focal length allocation of the first lens 1 to the eighteenth lens 18 satisfies the following relationship:

[0059] 1.2<f(1-18)Y / f(1-18)X<1.8;

[0060] -2.0<f(4-6)X / f(1-8)X<-1.2;

[0061] -1.5<f(12)Y / f(9-18)Y<-0.7;

[0062] 0.2<f(13-18)Y / f(9-18)Y<1.0;

[0063] 1.5<f(1-8)X / f(9-18)X<2.3;

[0064] Wherein, the curvature direction of the fourth lens 4 is the X direction, and the Y direction is the direction perpendicular to X; f(m-n)Y is the combined optical focal length of the m-th to n-th lenses along the Y direction, and f(m-n)X is the combined optical focal length of the m-th to n-th lenses along the X direction, where m and n are both positive integers, and 1≤m<n≤18. In some embodiments of this example, the focal length allocation of the first lens 1 to the eighteenth lens 18 satisfies the following conditions:

[0065] f(1-18)Y / f(1-18)X=1.34;

[0066] f(4-6)X / f(1-8)X=-1.73;

[0067] f(12)Y / f(9-18)Y=-1.25;

[0068] f(13-18)Y / f(9-18)Y=0.51;

[0069] f(1-8)X / f(9-18)X=1.82.

[0070] In other embodiments of this example, the number of lenses in the anamorphic lens is not limited to 18 lenses. The number of lenses in the anamorphic lens can be further varied, as long as the combined optical focal length of the various lens groups in the anamorphic lens satisfies the above mathematical relationship.

[0071] In this embodiment, the anamorphic lens has a combined optical focal length of 48mm in the Y direction. The zoom ratio of the anamorphic lens is 1.33X, and the magnification remains constant across different object distances. The total optical length of the anamorphic lens does not exceed 145mm. The aperture of the anamorphic lens does not exceed F-number 2.

[0072] In this embodiment, the eleventh lens 11 constitutes the internal focusing group. During adjustment, the overall length of the lens remains unchanged, and the floating internal focusing group is used to achieve focusing from the object-image distance from 0.5m to infinity, while overcoming the technical difficulties of large breathing effect and inconsistent magnification of 48mm anamorphic lenses.

[0073] In this embodiment, the fifth lens 5 and the sixth lens 6 are cemented together to form a cemented doublet cylindrical lens; the ninth lens 9 and the tenth lens 10 are cemented together to form a cemented doublet spherical lens; the thirteenth lens 13 and the fourteenth lens 14 are cemented together to form a cemented doublet spherical lens; and the fifteenth lens 15 and the sixteenth lens 16 are cemented together to form a cemented doublet spherical lens. The cemented doublet spherical lens is used to correct the optical chromatic aberration of the anamorphic lens in the horizontal and vertical directions.

[0074] It should be noted that the above-mentioned multiple sets of cemented doublet spherical lenses are joined by adhesive bonding. As an alternative implementation, based on the concept of this utility model, and to distinguish it from this application, modifications to the joining method, such as bonding or integral molding, and adaptive changes to the shape of the joined lenses, should also be included within the scope of protection 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 merged 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 of this patent, are all within the scope of protection of this application, provided they do not depart from the spirit and intent of this application.

[0075] 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 spherical lens group G7 are all optical glass lenses.

[0076] See Figure 3 As shown, the spherical aberration diagram, field curvature diagram, and distortion diagram of the anamorphic lens are presented. From the curves in the figure, it can be seen that the spherical aberration is basically less than ±0.5, ensuring the sharpness of the image center; the field curvature is basically less than ±0.5, ensuring the same sharpness in a large field of view; and the distortion is less than 10%, ensuring that the image has a small deformation.

[0077] Reference Figure 4 and Figure 5 By adjusting the internal focus group within the anamorphic lens, the overall length of the anamorphic lens remains unchanged, achieving an ultra-close object distance of 0.5m for a high-magnification anamorphic lens in a full-frame camera.

[0078] See Figure 6 As shown, the spherical aberration diagram, field curvature diagram, and distortion diagram of the anamorphic lens at close object distance are shown. From the curves in the figure, it can be seen that the spherical aberration is basically less than ±0.5, ensuring the sharpness of the image center; the field curvature is basically less than ±0.5, ensuring the same sharpness in the large field of view; and the distortion is less than 10%, ensuring that the image has a small deformation.

[0079] Table 1 below lists the actual parameters of each lens in this embodiment that conform to the above mathematical relationships:

[0080]

[0081]

[0082] The aspherical coefficients of the eighteenth lens (18) are shown in Table 1 below:

[0083] Eighteenth Lens Page 1 Page 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

[0084] Table 2

[0085] The anamorphic lens provided by this utility model adopts an integrated design, achieving excellent optical performance at a cost-effective price while maintaining a small lens size, including high resolution, low breathing, low distortion, full-frame capability, and 1.33X high magnification. It can be designed to be compatible with various brands of cameras on the market according to actual usage needs, so as to achieve personalized customization and universal compatibility.

[0086] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A morph lens characterized by, It includes 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) arranged sequentially from the object side to the image side along the optical path; The first spherical lens group (G1) has positive optical power, the first cylindrical lens group (G2) has negative optical power, the second spherical lens group (G3) has positive optical power, the third spherical lens group (G4) has positive optical power, the fourth spherical lens group (G5) has negative optical power, the second cylindrical lens group (G6) has negative optical power, and the fifth lens group (G7) has positive optical power. The combined optical focal length of all lens groups satisfies the following condition: 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 X; f(G1-G7)Y is the combined 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 combined 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 combined optical focal length of the first cylindrical lens group (G2) along the X direction, and f(G1-G3)X is the combined optical focal length of the first spherical lens group (G1-G7) along the X direction. The combined optical focal length along the X direction of the second spherical lens group (G1) to the second spherical lens group (G3), f(G6)Y is the combined optical focal length along the Y direction of the second cylindrical lens group (G6), f(G7)Y is the combined optical focal length along the Y direction of the fifth lens group (G7), f(G4-G7)Y is the combined optical focal length along the Y direction of the third spherical lens group (G4) to the fifth lens group (G7), and f(G4-G7)X is the combined optical focal length along the X direction of the third spherical lens group (G4) to the fifth lens group (G7).

2. The morph lens of claim 1, wherein, The first spherical lens group (G1) includes a first lens (1), a second lens (2) and a third lens (3) arranged sequentially from the object side to the image side along the optical path; the first lens (1) is a spherical lens with negative optical power, the second lens (2) is a spherical lens with negative optical power, and the third lens (3) is a spherical lens with positive optical power. The first cylindrical lens group (G2) includes a fourth lens (4), a fifth lens (5) and a sixth lens (6) arranged sequentially from the object side to the image side along the optical path; the fourth lens (4) is a cylindrical lens with negative optical power, the fifth lens (5) is a cylindrical lens with negative optical power, and the sixth lens (6) is a cylindrical lens with positive optical power. The second spherical lens group (G3) includes a seventh lens (7) and an eighth lens (8) arranged sequentially from the object side to the image side along the optical path. The seventh lens (7) is a spherical lens with negative optical power, and the eighth lens (8) is a spherical lens with positive optical power. The third spherical lens group (G4) includes a ninth lens (9) and a tenth lens (10) arranged sequentially from the object side to the image side along the optical path; the ninth lens (9) is a spherical lens with positive optical power, and the tenth lens (10) is a spherical lens with negative optical power. The fourth spherical lens group (G5) includes an eleventh lens (11) arranged sequentially from the object side to the image side along the optical path; the eleventh lens (11) is a spherical lens with negative optical power; The second cylindrical lens group (G6) includes a twelfth lens (12) arranged sequentially from the object side to the image side along the optical path; the twelfth lens (12) is a cylindrical lens with negative optical power; 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 sequentially from the object side to the image side along the optical path; the thirteenth lens (13) is a spherical lens with positive optical power, the fourteenth lens (14) is a spherical lens with negative optical power, the fifteenth lens (15) is a spherical lens with negative optical power, the sixteenth lens (16) is a spherical lens with positive optical power, the seventeenth lens (17) is a spherical lens with positive optical power, and the eighteenth lens (18) is an aspherical lens with negative optical power.

3. The morph lens of claim 2, wherein, The eleventh lens (11) constitutes the inner focusing group.

4. The morph lens of claim 2, wherein, The fifth lens (5) and the sixth lens (6) are cemented together to form a cemented doublet cylindrical lens; and / or, the ninth lens (9) and the tenth lens (10) are cemented together to form a cemented doublet spherical lens; and / or, the thirteenth lens (13) and the fourteenth lens (14) are cemented together to form a cemented doublet spherical lens; and / or, the fifteenth lens (15) and the sixteenth lens (16) are cemented together to form a cemented doublet spherical lens.

5. The anamorphic lens according to claim 1, characterized in that, The anamorphic lens has a combined optical focal length of 48mm in the Y direction.

6. The morph lens of claim 1, wherein, The anamorphic lens has a zoom ratio of 1.33X, and the magnification remains constant at different object distances.

7. The morph lens of claim 1, wherein, The total optical length of the anamorphic lens does not exceed 145mm.

8. The anamorphic lens according to claim 1, characterized in that, The aperture value of the anamorphic lens does not exceed 2.

9. The morph lens of claim 1, wherein, 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.

Images