Anamorphic Lens

Abstract

In the field of optical lenses, we provide anamorphic lenses. The optical system includes a first cylindrical lens group G1, a first spherical 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 in this order from the object side to the image side, and the focal lengths of all the lens groups are 1.2

Description

[Technical Field]

[0001] The present invention relates to the field of optical lenses, and more particularly to anamorphic lenses. [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 technologies such as 5G, the sharing of videos such as vlogs has increased, and more and more people are using tools such as mobile phones and cameras to shoot short films and microfilms.

[0003] However, the typical shooting ratio for devices such as mobile phones, tablet PCs, and cameras on the market today is 16:9, while the ratio for widescreen video with a cinematic feel is 2.4:1. At the same time, good microfilm and video shooting requires a combination of lenses with different focal lengths, especially for close-ups of people, a medium-to-long focal length anamorphic lens is required.

[0004] Existing anamorphic lenses have technical problems such as high price, large volume and weight, large breathing effect, and inconsistent magnification, and there are currently very few autofocus full-frame anamorphic lenses on the market. Summary of the Invention [Problem to be solved by the invention]

[0005] Therefore, the technical problem that the present invention aims to solve is to overcome the technical problems of the anamorphic lens in the prior art, such as high price, large volume weight, large breathing effect, and inconsistent magnification, and thereby provide an anamorphic lens. [Means for solving the problem]

[0006] In order to solve the above technical problems, the technical solution of the present invention is as follows. An anamorphic lens, comprising a first cylindrical lens group, a first spherical 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 sequentially arranged from the object side to the image side, the first cylindrical lens group has a negative power, the first spherical lens group has a positive power, the second spherical lens group has a positive power, the third spherical lens group has a negative power, the fourth spherical lens group has a positive power, the second cylindrical lens group has a negative power, and the fifth lens group has a positive power, the combined optical focal length of all lens groups is 1.2 < f(G1-G7)Y / f(G1-G7)X < 1.8, -7.7 < f(G2)X / f(G1-G2)X < -6.9, -1.8 < f(G6)Y / f(G3-G7)Y < -1.0, 0.6 < f(G7)Y / f(G3-G7)Y < 1.4, satisfies the conditional expressions of -4.6 < f(G1-G2)X / f(G3-G7)X < -3.8, where the curvature direction of the first cylindrical lens group is the X direction, the Y direction is the direction perpendicular to X, f(G1-G7)Y is the combined optical focal length along the Y direction from the first cylindrical lens group to the fifth lens group, f(G1-G7)X is the combined optical focal length along the X direction from the first cylindrical lens group to the fifth lens group, f(G2)X is the combined optical focal length along the X direction of the first spherical lens group, f(G1-G2)X is the combined optical focal length along the X direction from the first cylindrical lens group to the first 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(G3-G7)Y is the combined optical focal length along the Y direction from the second spherical lens group (G3) to the fifth lens group, and f(G3-G7)X is the combined optical focal length along the X direction from the second spherical lens group (G3) to the fifth lens group.

[0007] Furthermore, the first cylindrical lens group includes a first lens, a second lens, and a third lens that are sequentially arranged from the object side to the image side along the optical path, the first lens being a cylindrical lens with negative power, the second lens being a cylindrical lens with negative power, and the third lens being a cylindrical lens with positive power; the first spherical lens group includes a fourth lens, a fifth lens, a sixth lens, and a seventh lens that are sequentially arranged from the object side to the image side along the optical path, the fourth lens being a spherical lens with negative power, the fifth lens being a spherical lens with positive power, the sixth lens being a spherical lens with negative power, and the seventh lens being a spherical lens with positive power; the second spherical lens group includes an eighth lens, a ninth lens, and a tenth lens that are sequentially arranged from the object side to the image side along the optical path, the eighth lens being a spherical lens with negative power, the ninth lens being a spherical lens with positive power, and the tenth lens being a spherical lens with positive power; the third spherical lens group includes an eleventh lens, the eleventh lens being a spherical lens with negative power; the fourth spherical lens group includes a twelfth lens and a thirteenth lens that are sequentially arranged from the object side to the image side along the optical path, the twelfth lens being a spherical lens with positive power, and the thirteenth lens being a spherical lens with negative power; the second cylindrical lens group includes a fourteenth lens, the fourteenth lens being a negative power cylindrical lens; The fifth lens group includes a fifteenth lens, a sixteenth lens, a seventeenth lens, and an eighteenth lens, which are arranged in this order from the object side to the image side along the optical path, and the fifteenth lens is a spherical lens with positive power, the sixteenth lens is a spherical lens with negative power, the seventeenth lens is a spherical lens with positive power, and the eighteenth lens is an aspherical lens with negative power.

[0008] Furthermore, the eleventh lens constitutes an inner focal group.

[0009] Further, the second lens and the third lens are bonded together to form a cylindrical doublet lens, and / or the fourth lens and the fifth lens are bonded together to form a spherical doublet lens, and / or the eighth lens and the ninth lens are bonded together to form a spherical doublet lens, and / or the twelfth lens and the thirteenth lens are bonded together to form a spherical doublet lens, and / or the fifteenth lens and the sixteenth lens are bonded together to form a spherical doublet lens.

[0010] Furthermore, the combined optical focal length of the anamorphic lens in the Y direction is 73 mm.

[0011] Furthermore, the zoom ratio of the anamorphic lens is 1.33X, and the magnification is constant at different object distances.

[0012] Furthermore, the total optical length of the anamorphic lens does not exceed 145 mm.

[0013] Furthermore, the aperture value of the anamorphic lens does not exceed 2.

[0014] Furthermore, the lenses of the first cylindrical lens group, the first spherical 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. [Effects of the Invention]

[0015] The technical solution of this invention has the following advantages: By combining an X-direction cylindrical lens group and a spherical lens group and rationally distributing power, the optical structure of the anamorphic lens is more compact and less expensive. Furthermore, the spherical lens group comprehensively corrects light rays. Furthermore, the optical properties of the cylindrical lens group are utilized to "compress" horizontally incident light rays and maintain vertically incident light rays, thereby increasing the horizontal shooting field of view of the lens and ensuring performance in the X direction. Furthermore, the Y-direction cylindrical lens group and spherical lens group stabilize performance in other directions. In this way, a full frame and high magnification are achieved. Furthermore, the compact design integrating cylindrical and spherical lenses results in a small lens volume, light weight, and significantly reduced costs. The aspherical lens can effectively correct the spherical aberration and astigmatism of the lens, improving lens resolution while reducing lens volume and weight. [Brief explanation of the drawings]

[0016] In order to more clearly describe the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces drawings that need to be used in the description of the specific embodiments or the prior art. It is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can further derive other drawings based on these drawings without any creative work. [Figure 1] 1 is a diagram showing the optical structure of an anamorphic lens in the X direction when the object-to-image distance is infinity in an embodiment of the present invention. [Figure 2] 1 is a diagram illustrating the optical structure of an anamorphic lens in the Y direction when the object-to-image distance is infinity in an embodiment of the present invention. [Figure 3] 3A and 3B are diagrams showing spherical aberration, field curvature, and distortion of an anamorphic lens when the object-to-image distance is infinity in an embodiment of the present invention. [Figure 4] 1 is a diagram showing the optical structure of an anamorphic lens in the X direction when the object-to-image distance is 0.6 m in an embodiment of the present invention. [Figure 5]1 is a diagram showing the optical structure of an anamorphic lens in the Y direction when the object-to-image distance is 0.6 m in an embodiment of the present invention. [Figure 6] 3A and 3B are diagrams showing spherical aberration, field curvature, and distortion of an anamorphic lens when the object-to-image distance is 0.6 m in an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0017] The following clearly and completely describes the technical solutions of the present invention with reference to the drawings, and it is obvious that the described embodiments are only some of the embodiments of the present invention, not all of the embodiments, and all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any creative work are all within the scope of protection of the present invention.

[0018] In describing the present invention, it should be understood that the orientations or positional relationships indicated by the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc., are based on the orientations or positional relationships shown in the drawings and are merely for ease and simplification of the description of the present invention, and do not indicate or suggest that such devices or elements must have a particular orientation or be constructed and operated in a particular orientation, and therefore are not limitations on the present invention. Furthermore, it should be understood that the terms "first," "second," and "third" are for illustrative purposes only and do not indicate or suggest relative importance.

[0019] The anamorphic lens shown in Figures 1 to 6 includes a first cylindrical lens group G1, a first spherical 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 in this order from the object side to the image side along the optical path. Here, the first cylindrical lens group G1 has negative power, the first spherical lens group G2 has positive power, the second spherical lens group G3 has positive power, the third spherical lens group G4 has negative power, the fourth spherical lens group G5 has positive power, the second cylindrical lens group G6 has negative power, and the fifth lens group G7 has positive power. The combined optical focal length of all the lens groups satisfies 1.2 < f(G1 - G7)Y / f(G1 - G7)X < 1.8, -7.7 < f(G2)X / f(G1 - G2)X < -6.9, -1.8 < f(G6)Y / f(G3 - G7)Y < -1.0, 0.6 < f(G7)Y / f(G3 - G7)Y < 1.4, -4.6 < f(G1 - G2)X / f(G3 - G7)X < -3.8. Here, the curvature direction of the first cylindrical lens group G1 is the X direction, the Y direction is perpendicular to X, f(G1 - G7)Y is the combined optical focal length along the Y direction from the first cylindrical lens group G1 to the fifth lens group G7, f(G1 - G7)X is the combined optical focal length along the X direction from the first cylindrical lens group G1 to the fifth lens group G7, f(G2)X is the combined optical focal length along the X direction of the first spherical lens group G2, f(G1 - G2)X is the combined optical focal length along the X direction from the first cylindrical lens group G1 to the first spherical lens group G2, 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(G3 - G7)Y is the combined optical focal length along the Y direction from the second spherical lens group G3 to the fifth lens group G7, and f(G3 - G7)X is the combined optical focal length along the X direction from the second spherical lens group G3 to the fifth lens group G7.

[0020] This type of anamorphic lens combines a cylindrical lens group and a spherical lens group in the X direction to rationally distribute power, making the optical structure of the anamorphic lens more compact and less expensive. The spherical lens group comprehensively corrects light rays, and utilizes the optical properties of the cylindrical lens group to "compress" horizontally entering light rays and maintain vertically entering light rays, thereby increasing the lens's horizontal shooting angle and ensuring performance in the X direction. Furthermore, the cylindrical lens group and spherical lens group in the Y direction stabilize performance in other directions. In this way, the lens achieves a full frame and high magnification. Furthermore, the compact design integrating cylindrical and spherical lenses results in a small lens volume, light weight, and significantly reduced cost. The aspherical lens effectively corrects the lens's spherical aberration and astigmatism, improving lens resolution while reducing lens volume and weight.

[0021] In some embodiments of this embodiment, the first cylindrical 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, where the first lens 1 is a cylindrical lens with negative power, the second lens 2 is a cylindrical lens with negative power, and the third lens 3 is a cylindrical lens with positive power.

[0022] The first spherical lens group G2 includes a fourth lens 4, a fifth lens 5, a sixth lens 6, and a seventh lens 7, which are arranged in sequence from the object side to the image side along the optical path, and the fourth lens 4 is a spherical lens with negative power, the fifth lens 5 is a spherical lens with positive power, the sixth lens 6 is a spherical lens with negative power, and the seventh lens 7 is a spherical lens with positive power.

[0023] The second spherical lens group G3 includes an eighth lens 8, a ninth lens 9, and a tenth lens 10 arranged in sequence from the object side to the image side along the optical path, where the eighth lens 8 is a spherical lens with negative power, the ninth lens 9 is a spherical lens with positive power, and the tenth lens 10 is a spherical lens with positive power.

[0024] The third spherical lens group G4 includes the 11th lens 11, and the 11th lens 11 is a spherical lens with negative power.

[0025] The fourth spherical lens group G5 includes the 12th lens 12 and the 13th lens 13 sequentially arranged from the object side to the image side along the optical path. The 12th lens 12 is a spherical lens with positive power, and the 13th lens 13 is a spherical lens with negative power.

[0026] The second cylindrical lens group G6 includes the 14th lens 14, and the 14th lens 14 is a cylindrical lens with negative power.

[0027] The fifth lens group G7 includes the 15th lens 15, the 16th lens 16, the 17th lens 17, and the 18th lens 18 sequentially arranged from the object side to the image side along the optical path. The 15th lens 15 is a spherical lens with positive power, the 16th lens 16 is a spherical lens with negative power, the 17th lens 17 is a spherical lens with positive power, and the 18th lens 18 is an aspherical lens with negative power.

[0028] The distribution of the focal lengths of the 1st lens 1 to the 18th lens 18 satisfies 1.2 < f(1 - 18)Y / f(1 - 18)X < 1.8, -7.7 < f(4 - 7)X / f(1 - 7)X < -6.9, -1.8 < f(14)Y / f(8 - 18)Y < -1.0, 0.6 < f(15 - 18)Y / f(8 - 18)Y < 1.4, -4.6 < f(1 - 7)X / f(8 - 18)X < -3.8. Here, the curvature direction of the first cylindrical lens group G1 is the X direction, the Y direction is the direction perpendicular to X, f(m - n)Y is the combined optical focal length along the Y direction from the mth lens to the nth lens, f(m - n)X is the combined optical focal length along the X direction from the mth lens to the nth lens, m and n are both positive integers, and 1 ≤ m < n ≤ 18. In some embodiments of this embodiment, the distribution of the focal lengths of the 1st lens 1 to the 18th lens 18 is f(1 - 18)Y / f(1 - 18)X = 1.33, f(4-7)X / f(1-7)X=-7.41, f(14)Y / f(8-18)Y=-1.46, f(15-18)Y / f(8-18)Y=0.89, The condition f(1-7)X / f(8-18)X=-4.26 is met.

[0029] In some other embodiments of this embodiment, the number of lenses in the anamorphic lens is not limited to 18 lenses, and the number of lenses in the anamorphic lens may be more variable, as long as the composite optical focal length of the various lens groups in the anamorphic lens satisfies the above mathematical relationship.

[0030] In this embodiment, the combined optical focal length of the anamorphic lens in the Y direction is 73 mm. The zoom ratio of the anamorphic lens is 1.33X, and the magnification is constant at different object distances. The total optical length of the anamorphic lens does not exceed 145 mm. The aperture value of the anamorphic lens does not exceed 2.

[0031] In this embodiment, the eleventh lens 11 constitutes an internal focal group. The overall length of the lens does not change during adjustment, and the floating internal focal group is used to achieve focusing from an object distance of 0.6 m to infinity, while overcoming the technical difficulties of the 73 mm anamorphic lens, such as the large breathing effect and inconsistent magnification.

[0032] In this embodiment, the second lens 2 and the third lens 3 are bonded together to form a cylindrical doublet lens, and / or the fourth lens 4 and the fifth lens 5 are bonded together to form a spherical doublet lens, the eighth lens 8 and the ninth lens 9 are bonded together to form a spherical doublet lens, the twelfth lens 12 and the thirteenth lens 13 are bonded together to form a spherical doublet lens, and the fifteenth lens 15 and the sixteenth lens 16 are bonded together to form a spherical doublet lens, and the spherical doublet lens is used to correct the optical chromatic aberrations in the horizontal and vertical directions of the anamorphic lens.

[0033] The multiple sets of spherical doublet lenses are bonded together. As an alternative embodiment, based on the concept of the present invention, the above-mentioned bonding method may be changed to, for example, bonding or integral molding, and the lens shape after bonding may be adaptively changed. For a single lens or two consecutive power lenses with the same sign, the single lens may be divided into two or more lenses, or two consecutive lenses with the same sign may be combined into one lens. In this way, a simple transformation is made to the optical structure of the utility model, for example, to allocate the power of the transformed lens or lens group within the mathematical relationship of the utility model. Based on this embodiment, the number of lenses or the combination method may be changed or replaced to distinguish it from the present application. All of these modifications fall within the scope of protection of the present application, provided they do not deviate from the spirit and scope of the present application.

[0034] In this embodiment, the lenses of the first cylindrical lens group G1, the first spherical 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.

[0035] FIG. 3 shows the spherical aberration, field curvature, and distortion of an anamorphic lens. As can be seen from the curves in the figure, the spherical aberration is basically less than ±0.5, ensuring clarity at the center of the image. The field curvature is basically less than ±0.5, ensuring similar clarity across a large field of view. The distortion is less than 10%, ensuring minimal distortion on the captured image.

[0036] Referring to Figures 4 and 5, by adjusting the internal focal group within the anamorphic lens, the overall length of the anamorphic lens remains unchanged, and the ultra-close object distance of the high magnification anamorphic lens in full frame is realized to be 0.6m.

[0037] Referring to FIG. 6, there is shown a graph of spherical aberration, field curvature, and distortion of an anamorphic lens at a close object distance. As can be seen from the curves in the graph, the spherical aberration is basically less than ±0.5, which ensures clarity at the center of the image. The field curvature is basically less than ±0.5, which ensures consistent clarity across a large field of view. The distortion is less than 10%, which ensures minimal distortion on the captured image.

[0038] Table 1 below lists the actual parameters for each lens in this example according to the mathematical relationships above. [Table 1]

[0039] The aspherical coefficients of the eighteenth lens 18 are shown in Table 2 below. [Table 2]

[0040] The anamorphic lens provided by this invention adopts an integrated design, realizing a compact lens while achieving excellent cost-effective optical performance such as high resolution, low breathing, low distortion, full frame, and 1.33X high magnification. It can be designed to be compatible with the mounts of various camera brands on the market according to actual usage needs, achieving both personalized customization and versatility.

[0041] It should be understood that the above examples are merely illustrative for the purpose of clarity and are not limiting of the embodiments. Those skilled in the art can make other different modifications or variations based on the above description. It is not possible or necessary to comprehensively list all the embodiments here. Any obvious modifications or variations derived therefrom are still within the scope of protection of the invention and creation. [Explanation of symbols]

[0042] G1 first cylindrical lens group, G2 first spherical lens group, G3 second spherical lens group, G4 third spherical lens group, G5 fourth spherical lens group, G6 second cylindrical lens group, G7 fifth 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.

Claims

1. The anamorphic lens includes a first cylindrical lens group (G1), a first spherical 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 in this order from the object side to the image side along an optical path, the first cylindrical lens group (G1) has negative power, the first spherical lens group (G2) has positive power, the second spherical lens group (G3) has positive power, the third spherical lens group (G4) has negative power, the fourth spherical lens group (G5) has positive power, the second cylindrical lens group (G6) has negative power, and the fifth lens group (G7) has positive power; The combined optical focal length of all lens groups is 1.2<f(G1-G7)Y / f(G1-G7)X<1.8, -7.7<f(G2)X / f(G1-G2)X<-6.9, -1.8<f(G6)Y / f(G3-G7)Y<-1.0, 0.6<f(G7)Y / f(G3-G7)Y<1.4, The conditional expression of −4.6<f(G1−G2)X / f(G3−G7)X<−3.8 is satisfied, Here, the curvature direction of the first cylindrical lens group (G1) is the X direction, the Y direction is the direction perpendicular to X, f(G1-G7)Y is the composite optical focal length of the first cylindrical lens group (G1) to the fifth lens group (G7) along the Y direction, f(G1-G7)X is the composite optical focal length of the first cylindrical lens group (G1) to the fifth lens group (G7) along the X direction, f(G2)X is the composite optical focal length of the first spherical lens group (G2) along the X direction, and f(G1-G2)X is the composite optical focal length of the first cylindrical lens group (G1) to the fifth lens group (G7) along the X direction. f(G6)Y is the composite optical focal length of the second cylindrical lens group (G6) along the Y direction, f(G7)Y is the composite optical focal length of the fifth lens group (G7) along the Y direction, f(G3-G7)Y is the composite optical focal length of the second spherical lens group (G3) to the fifth lens group (G7) along the Y direction, and f(G3-G7)X is the composite optical focal length of the second spherical lens group (G3) to the fifth lens group (G7) along the X direction.

2. the first cylindrical lens group (G1) includes a first lens (1), a second lens (2), and a third lens (3) that are sequentially arranged along an optical path from the object side to the image side, the first lens (1) being a cylindrical lens with negative power, the second lens (2) being a cylindrical lens with negative power, and the third lens (3) being a cylindrical lens with positive power; the first spherical lens group (G2) includes a fourth lens (4), a fifth lens (5), a sixth lens (6), and a seventh lens (7) that are sequentially arranged along the optical path from the object side to the image side, the fourth lens (4) being a spherical lens with negative power, the fifth lens (5) being a spherical lens with positive power, the sixth lens (6) being a spherical lens with negative power, and the seventh lens (7) being a spherical lens with positive power; the second spherical lens group (G3) includes an eighth lens (8), a ninth lens (9), and a tenth lens (10) that are sequentially arranged from the object side to the image side along the optical path, the eighth lens (8) being a spherical lens with negative power, the ninth lens (9) being a spherical lens with positive power, and the tenth lens (10) being a spherical lens with positive power; the third spherical lens group (G4) includes an eleventh lens (11), the eleventh lens (11) being a spherical lens with negative power; the fourth spherical lens group (G5) includes a twelfth lens (12) and a thirteenth lens (13) that are sequentially arranged from the object side to the image side along the optical path, the twelfth lens (12) being a spherical lens with positive power, and the thirteenth lens (13) being a spherical lens with negative power; the second cylindrical lens group (G6) includes a fourteenth lens (14), the fourteenth lens (14) being a cylindrical lens with negative power; The anamorphic lens of claim 1, wherein the fifth lens group (G7) includes a fifteenth lens (15), a sixteenth lens (16), a seventeenth lens (17), and an eighteenth lens (18) arranged in sequence from the object side to the image side along the optical path, the fifteenth lens (15) being a spherical lens with positive power, the sixteenth lens (16) being a spherical lens with negative power, the seventeenth lens (17) being a spherical lens with positive power, and the eighteenth lens (18) being an aspherical lens with negative power.

3. 3. The anamorphic lens according to claim 2, wherein the eleventh lens (11) constitutes an internal focal group.

4. 3. The anamorphic lens of claim 2, wherein the second lens (2) and the third lens (3) are bonded together to form a cylindrical doublet lens, and / or the fourth lens (4) and the fifth lens (5) are bonded together to form a spherical doublet lens, and / or the eighth lens (8) and the ninth lens (9) are bonded together to form a spherical doublet lens, and / or the twelfth lens (12) and the thirteenth lens (13) are bonded together to form a spherical doublet lens, and / or the fifteenth lens (15) and the sixteenth lens (16) are bonded together to form a spherical doublet lens.

5. 2. The anamorphic lens of claim 1, wherein the combined optical focal length of the anamorphic lens in the Y direction is 73 mm.

6. 2. The anamorphic lens of claim 1, wherein the zoom ratio of the anamorphic lens is 1.33X and the magnification is constant at different object distances.

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

8. 2. The anamorphic lens of claim 1, wherein the aperture value of the anamorphic lens does not exceed 2.

9. 2. The anamorphic lens of claim 1, wherein the lenses of the first cylindrical lens group (G1), the first spherical 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