widescreen anamorphic lens

Abstract

In the field of optical lenses, we provide widescreen 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 second cylindrical lens group G4, a third cylindrical lens group G5, and a third spherical lens group G6, which are arranged in this order from the object side to the image side along the optical path, 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 widescreen 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 widescreen 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 a widescreen 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. A wide-screen anamorphic lens, including a first cylindrical lens group, a first spherical lens group, a second spherical lens group, a second cylindrical lens group, a third cylindrical lens group, and a third spherical lens group sequentially arranged from the object side to the image side along the optical path. 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 negative power, the second cylindrical lens group has a positive power, the third cylindrical lens group has a positive power, and the third spherical lens group has a positive power. The combined optical focal length of all lens groups is 1.2 < f(G1 - G6)X / f(G1 - G6)Y < 1.8, -0.9 < f(G5)X / f(G1)Y < -0.3, 2.2 < f(G5)X / f(G4)Y < 3.2, -5 < f(G1)Y / f(G4)Y < -3, 0 < f(G2) / f(G6) < 0.5, -1.5 < f(G2) / f(G3) < -1, -0.2 < f(G3) / f(G6) < -0.1, satisfying the conditional expressions. Here, the curvature directions of the first cylindrical lens group and the second cylindrical lens group are in the Y direction, the X direction is perpendicular to the Y direction, f(G1 - G6)X is the combined optical focal length along the X direction from the first cylindrical lens group to the third spherical lens group, f(G1 - G6)Y is the combined optical focal length along the Y direction from the first cylindrical lens group to the third spherical lens group, f(G5)X is the combined optical focal length along the X direction of the third cylindrical lens group, f(G1)Y is the combined optical focal length along the Y direction of the first cylindrical lens group, f(G4)Y is the combined optical focal length along the Y direction of the second cylindrical lens group, f(G2) is the combined optical focal length of the first spherical lens group, f(G3) is the combined optical focal length of the second spherical lens group, f(G6) is the combined optical focal length of the third spherical lens group, and the focal lengths in the X direction and the Y direction of the spherical lens group are the same.

[0007] Furthermore, the first cylindrical lens group includes a first lens and a second lens sequentially arranged from the object side to the image side along the optical path, the first lens being a cylindrical lens with negative power, and the second lens being a cylindrical lens with positive power; the first spherical lens group includes a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens which are arranged in order from the object side to the image side along the optical path, the third lens being a spherical lens with positive power, the fourth lens being a spherical lens with positive power, the fifth lens being a spherical lens with negative power, the sixth lens being a spherical lens with negative power, the seventh lens being a spherical lens with positive power, the eighth lens being a spherical lens with negative power, and the ninth lens being a spherical lens with positive power; the second spherical lens group includes a tenth lens, the tenth lens being a negative-power spherical lens; the second cylindrical lens group includes an eleventh lens, the eleventh lens being a cylindrical lens with a positive power; the third cylindrical lens group includes a twelfth lens and a thirteenth lens sequentially disposed along the optical path from the object side to the image side, the twelfth lens being a cylindrical lens with negative power, and the thirteenth lens being a cylindrical lens with positive power; The third spherical lens group includes a 14th lens, a 15th lens, a 16th lens, a 17th lens, and an 18th lens, which are arranged in sequence from the object side to the image side along the optical path, and the 14th lens is a spherical lens with positive power, the 15th lens is a spherical lens with negative power, the 16th lens is a spherical lens with positive power, the 17th lens is a spherical lens, and the 18th lens is a spherical lens with negative power.

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

[0009] Furthermore, the fourth lens and the fifth lens are bonded together to form a spherical doublet lens, and / or the seventh lens and the eighth 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 fourteenth lens and the fifteenth lens are bonded together to form a spherical doublet lens, and / or the seventeenth lens is a spherical lens with negative power, and the seventeenth lens and the sixteenth lens are bonded together to form a spherical doublet lens, or the seventeenth lens is a spherical lens with positive power, and the seventeenth lens and the eighteenth lens are bonded together to form a spherical doublet lens.

[0010] Furthermore, the combined optical focal length of the widescreen anamorphic lens in the X direction is 85 mm to 135 mm.

[0011] Furthermore, the zoom ratio of the widescreen anamorphic lens is 1.1X~1.5X, and the magnification is constant at different object distances.

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

[0013] Furthermore, the aperture value of said widescreen anamorphic lens does not exceed 2.0.

[0014] Furthermore, the composite optical focal length of the widescreen anamorphic lens in the X direction is 98 mm, the zoom ratio of the widescreen anamorphic lens is 1.33X, and the magnification is constant at different object distances, and the aperture value of the widescreen anamorphic lens is 1.8.

[0015] Furthermore, the lenses of the first cylindrical lens group, the first spherical lens group, the second spherical lens group, the second cylindrical lens group, the third cylindrical lens group, and the third spherical lens group are all optical glass lenses. [Effects of the Invention]

[0016] The technical solution of this invention has the following advantages. By combining two Y-direction cylindrical lens groups, one X-direction cylindrical lens group, and multiple spherical lens groups and rationally allocating the power and position of the cylindrical lens groups, the optical structure of the widescreen anamorphic lens is more compact and less expensive. Furthermore, the spherical lens groups comprehensively correct light rays. Furthermore, the optical properties of the cylindrical lens groups are utilized to "compress" horizontally incident light rays and maintain vertically incident light rays, thereby increasing the horizontal field of view of the lens and ensuring performance in the X direction. Furthermore, the Y-direction cylindrical lens group and spherical lens groups stabilize performance in other directions. In this way, the horizontal field of view of the lens is increased, i.e., the actual image width is increased, while maintaining the same widening ratio at different working distances. Furthermore, the compact design integrating cylindrical and spherical lenses allows for a compact lens while also achieving optical performance such as a large aperture, high resolution, low breathing, low distortion, a fixed distortion ratio, and elliptical out-of-focus spots. [Brief explanation of the drawings]

[0017] 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 illustrating the optical structure of a widescreen anamorphic lens in the Y direction when the object-to-image distance is infinity in the first embodiment of the present invention. [Figure 2] 1 is a diagram illustrating the optical structure of a widescreen anamorphic lens in the X direction when the object-to-image distance is infinity in a first embodiment of the present invention; [Figure 3.1]1 is a diagram showing spherical aberration of a widescreen anamorphic lens when the object-image distance is infinity in the first embodiment of the present invention; FIG. [Figure 3.2] 1 is a diagram showing the field curvature of a widescreen anamorphic lens when the object-to-image distance is infinity in the first embodiment of the present invention; FIG. [Figure 3.3] 1 is a diagram illustrating distortion of a widescreen anamorphic lens when the object-to-image distance is infinity in the first embodiment of the present invention; [Figure 4] 10 is a diagram illustrating the optical structure of a widescreen anamorphic lens in the Y direction when the object-to-image distance is infinity in a second embodiment of the present invention. [Figure 5] 10 is a diagram illustrating the optical structure of a widescreen anamorphic lens in the X direction when the object-to-image distance is infinity in a second embodiment of the present invention. [Figure 6.1] 10 is a diagram illustrating spherical aberration of a widescreen anamorphic lens when the object-image distance is infinity in the second embodiment of the present invention; FIG. [Figure 6.2] 10 is a diagram illustrating spherical aberration of a widescreen anamorphic lens when the object-image distance is infinity in the second embodiment of the present invention; FIG. [Figure 6.3] 10 is a diagram illustrating the field curvature of a widescreen anamorphic lens when the object-to-image distance is infinity in a second embodiment of the present invention; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0018] 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.

[0019] In the description of the present invention, as things to be explained, the directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, and are merely for facilitating the description of the present invention and simplifying the description, and do not indicate or suggest that such devices or elements must have a specific direction and must be structured and operated in a specific direction, so it should be understood that it does not impose a limitation on the present invention. Also, it should be understood that the terms "first", "second", "third" are only for the purpose of explanation and do not indicate or suggest relative importance.

[0020] A wide-screen anamorphic lens shown in FIGS. 1 to 2, including a first cylindrical lens group G1, a first spherical lens group G2, a second spherical lens group G3, a second cylindrical lens group G4, a third cylindrical lens group G5, and a third spherical lens group G6 sequentially arranged from the object side to the image side along the optical path. Here, the first cylindrical lens group G1 has a negative power, the first spherical lens group G2 has a positive power, the second spherical lens group G3 has a negative power, the second cylindrical lens group G4 has a positive power, the third cylindrical lens group G5 has a positive power, and the third spherical lens group G6 has a positive power. The combined optical focal length of all the lens groups is 1.2 < f(G1 - G6)X / f(G1 - G6)Y < 1.8, -0.9 < f(G5)X / f(G1)Y < -0.3, 2.2 < f(G5)X / f(G4)Y < 3.2, -5 < f(G1)Y / f(G4)Y < -3, 0 < f(G2) / f(G6) < 0.5, -1.5 < f(G2) / f(G3) < -1, -0.2 < f(G3) / f(G6) < -0.1 satisfies the conditional expression. Here, the curvature direction of the first cylindrical lens group G1 and the second cylindrical lens group G4 is the Y direction, the X direction is the direction perpendicular to Y, f(G1-G6)X is the composite optical focal length of the first cylindrical lens group G1 to the third spherical lens group G6 along the X direction, f(G1-G6)Y is the composite optical focal length of the first cylindrical lens group G1 to the third spherical lens group G6 along the Y direction, f(G5)X is the composite optical focal length of the third cylindrical lens group G5 along the X direction, and f (G1)Y is the composite optical focal length of the first cylindrical lens group G1 along the Y direction, f(G4)Y is the composite optical focal length of the second cylindrical lens group G4 along the Y direction, f(G2) is the composite optical focal length of the first spherical lens group G2, f(G3) is the composite optical focal length of the second spherical lens group G3, and f(G6) is the composite optical focal length of the third spherical lens group G6, and the spherical lens groups have the same focal length in each direction including the X and Y directions.

[0021] This widescreen anamorphic lens combines two Y-axis cylindrical lens groups, one X-axis cylindrical lens group, and multiple spherical lens groups. By rationally allocating power and the positioning of the cylindrical lens groups, the optical structure of the widescreen anamorphic lens is more compact and less expensive. The spherical lens groups provide comprehensive correction of light rays, and the optical properties of the cylindrical lens groups are utilized to "compress" horizontally incoming light rays and maintain vertically incoming light rays, thereby increasing the lens's horizontal field of view and ensuring performance in the X direction. Furthermore, the Y-axis cylindrical lens group and spherical lens groups stabilize performance in other directions. In this way, the lens's horizontal field of view, or the actual image width, is increased, while maintaining the same widening ratio at different working distances. Furthermore, the compact design integrating cylindrical and spherical lenses allows for a compact lens while also achieving optical performance such as a large aperture, high resolution, low breathing, low distortion, a fixed distortion ratio, and elliptical out-of-focus spots.

[0022] In some embodiments of this embodiment, the first cylindrical lens group G1 includes a first lens 1 and a second lens 2 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 and the second lens 2 is a cylindrical lens with positive power.

[0023] The first spherical lens group G2 includes a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an eighth lens 8, and a ninth lens 9, which are arranged in sequence from the object side to the image side along the optical path, and the third lens 3 is a spherical lens with positive power, the fourth lens 4 is a spherical lens with positive power, the fifth lens 5 is a spherical lens with negative power, the sixth lens 6 is a spherical lens with negative power, the seventh lens 7 is a spherical lens with positive power, the eighth lens 8 is a spherical lens with negative power, and the ninth lens 9 is a spherical lens with positive power.

[0024] The second spherical lens group G3 includes a tenth lens 10, which is a spherical lens with negative power.

[0025] The second cylindrical lens group G4 includes an eleventh lens 11, which is a cylindrical lens with a positive power.

[0026] The third cylindrical lens group G5 includes a twelfth lens 12 and a thirteenth lens 13 arranged sequentially from the object side to the image side along the optical path, the twelfth lens 12 being a cylindrical lens with negative power, and the thirteenth lens 13 being a cylindrical lens with positive power.

[0027] The third spherical lens group G6 includes a fourteenth lens 14, a fifteenth lens 15, a sixteenth lens 16, a seventeenth lens 17, and an eighteenth lens 18, which are arranged in sequence from the object side to the image side along the optical path, and the fourteenth lens 14 is a spherical lens with positive power, the fifteenth lens 15 is a spherical lens with negative power, the sixteenth lens 16 is a spherical lens with positive power, the seventeenth lens 17 is a spherical lens, and the eighteenth lens 18 is a spherical lens with negative power.

[0028] 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 second cylindrical lens group G4, the third cylindrical lens group G5, and the third spherical lens group G6 are all optical glass lenses.

[0029] In some embodiments of this embodiment, the widescreen anamorphic lens includes a total of 18 lenses, from the first lens 1 to the eighteenth lens 18. In other embodiments of this embodiment, the number of lenses in the widescreen anamorphic lens is not limited to 18 lenses, and the number of lenses in the widescreen anamorphic lens may be more variable, as long as the composite optical focal length of the various lens groups in the widescreen anamorphic lens satisfies the above mathematical relationship.

[0030] In this embodiment, the total optical length of the widescreen anamorphic lens does not exceed 145 mm, the composite optical focal length in the X direction of the widescreen anamorphic lens is 85 mm to 135 mm, the zoom ratio of the widescreen anamorphic lens is 1.1X to 1.5X, and the magnification is constant at different object distances, and the aperture value of the widescreen anamorphic lens does not exceed 2.0. In a specific embodiment of this embodiment, the total optical length of the widescreen anamorphic lens is 145 mm, the composite optical focal length in the X direction of the widescreen anamorphic lens is 98 mm, the zoom ratio of the widescreen anamorphic lens is 1.33X, and the magnification is constant at different object distances, and the aperture value of the widescreen anamorphic lens is 1.8.

[0031] In this embodiment, the second spherical lens group G3 constitutes an internal focal group. During adjustment, the overall length of the lens remains unchanged, and the floating second spherical lens group G3 is used to move along the optical axis, while the positions of the remaining lens groups relative to the image side remain unchanged. This allows focusing from an object-to-image distance of 0.7 m to infinity, while overcoming the technical difficulties of 98 mm widescreen anamorphic lenses, such as the large breathing effect and inconsistent magnification.

[0032] In the first embodiment of this example, the distribution of the focal lengths of the first lens 1 to the eighteenth lens 18 is f(1-18)X / f(1-18)Y = 1.33, f(12-13)X / f(1-2)Y = -0.71, f(12-13)X / f(11)Y = 2.81, f(1-2)Y / f(11)Y = -3.95, f(3-9) / f(14-18) = 0.25, f(3-9) / f(10) = -1.33, satisfies the relationship of f(10) / f(14-18) = -0.18.

[0033] Here, the curvature directions of the first lens 1, the second lens 2, and the eleventh lens 11 are in the Y direction, the X direction is perpendicular to Y, and the curvature directions of the twelfth lens 12 and the thirteenth lens 13 are in the X direction. f(m-n)Y is the combined optical focal length along the Y direction from the m-th lens to the n-th lens, f(m-n)X is the combined optical focal length along the X direction from the m-th lens to the n-th lens, f(m-n) is the combined optical focal length from the m-th lens to the n-th lens, m and n are both positive integers, and 1 ≤ m < n ≤ 18. The focal length in the X direction and the focal length in the Y direction of the spherical lens are the same.

[0034] As shown in FIGS. 1 and 2, in the first embodiment of this example, the fourth lens 4 and the fifth lens 5 are adhered to form a spherical doublet lens, the seventh lens 7 and the eighth lens 8 are adhered to form a spherical doublet lens, the twelfth lens 12 and the thirteenth lens 13 are adhered to form a spherical doublet lens, and the fourteenth lens 14 and the fifteenth lens 15 are adhered to form a spherical doublet lens. The seventeenth lens 17 is a spherical lens with negative power, and the sixteenth lens 16 and the seventeenth lens 17 are adhered to form a spherical doublet lens. The spherical doublet lens is used to correct the optical chromatic aberration in the horizontal and vertical directions of the anamorphic lens.

[0035] The multiple sets of 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.

[0036] Referring to Figures 3.1, 3.2 and 3.3, these are the spherical aberration diagrams, field curvature diagrams and distortion aberration diagrams of the widescreen anamorphic lens in the first embodiment. As can be seen from the curves in the figures, the spherical aberration is basically less than ±0.5, which ensures the clarity of the image center; the field curvature is basically less than ±0.5, which ensures the same clarity on the large field of view screen; and the distortion amount is less than 10%, which ensures that a small amount of deformation appears on the captured image.

[0037] Table 1 below lists the actual parameters of each lens of the widescreen anamorphic lens in the first embodiment according to the above mathematical relationships. [Table 1]

[0038] As shown in FIGS. 4 and 5, in the second embodiment of this example, the focal lengths of the first lens 1 to the eighteenth lens 18 are distributed as follows: f(1-18)X / f(1-18)Y=1.33, f(12-13)X / f(1-2)Y=-0.53, f(12-13)X / f(11)Y=2.4, f(1 - 2)Y / f(11)Y = -4.51, f(3 - 9) / f(14 - 18) = 0.13, f(3 - 9) / f(10) = -1.19, It satisfies the condition that f(10) / f(14 - 18) = -0.11.

[0039] Here, the curvature directions of the first lens 1, the second lens 2, and the eleventh lens 11 are in the Y direction, the X direction is perpendicular to Y, and the curvature directions of the twelfth lens 12 and the thirteenth lens 13 are in the X direction. f(m - n)Y is the combined optical focal length along the Y direction from the m-th lens to the n-th lens, f(m - n)X is the combined optical focal length along the X direction from the m-th lens to the n-th lens, f(m - n) is the combined optical focal length from the m-th lens to the n-th lens, m and n are both positive integers, and 1 ≤ m < n ≤ 18. The focal lengths in the X direction and the Y direction of the spherical lens are the same.

[0040] As shown in FIGS. 4 and 5, in the second embodiment of this example, the fourth lens 4 and the fifth lens 5 are adhered to form a spherical doublet lens, the seventh lens 7 and the eighth lens 8 are adhered to form a spherical doublet lens, the twelfth lens 12 and the thirteenth lens 13 are adhered to form a spherical doublet lens, and the fourteenth lens 14 and the fifteenth lens 15 are adhered to form a spherical doublet lens. The seventeenth lens 17 is a spherical lens with positive power, and the seventeenth lens 17 and the eighteenth lens 18 are adhered to form a spherical doublet lens. The spherical doublet lens is used to correct the optical chromatic aberration in the horizontal and vertical directions of the anamorphic lens.

[0041] Referring to FIGS. 6.1, 6.2, and 6.3, they are the spherical aberration diagram, field curvature diagram, and distortion aberration diagram of the wide-screen anamorphic lens in the second embodiment. As can be seen from the curves in the figures, the spherical aberration is basically less than ±0.5, ensuring the sharpness at the image center, the field curvature is basically less than ±0.5, ensuring the same sharpness for a large-field screen, and the distortion amount is less than 10%, ensuring that a small deformation amount appears in the imaging screen.

[0042] Table 2 below lists the actual parameters of each lens of the widescreen anamorphic lens in the second embodiment according to the above mathematical relationships. [Table 2]

[0043] The widescreen 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.

[0044] 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]

[0045] G1 first cylindrical lens group, G2 first spherical lens group, G3 second spherical lens group, G4 second cylindrical lens group, G5 third cylindrical lens group, G6 third 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.

Claims

1. A widescreen anamorphic lens includes a first cylindrical lens group (G1), a first spherical lens group (G2), a second spherical lens group (G3), a second cylindrical lens group (G4), a third cylindrical lens group (G5), and a third spherical lens group (G6), 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 negative power, the second cylindrical lens group (G4) has positive power, the third cylindrical lens group (G5) has positive power, and the third spherical lens group (G6) has positive power; The combined optical focal length of all lens groups is 1.2<f(G1-G6)X / f(G1-G6)Y<1.8, -0.9<f(G5)X / f(G1)Y<-0.3, 2.2<f(G5)X / f(G4)Y<3.2, -5<f(G1)Y / f(G4)Y<-3, 0<f(G2) / f(G6)<0.5, -1.5<f(G2) / f(G3)<-1, The conditional expression -0.2<f(G3) / f(G6)<-0.1 is satisfied, Here, the curvature direction of the first cylindrical lens group (G1) and the second cylindrical lens group (G4) is the Y direction, the X direction is the direction perpendicular to the Y direction, f(G1-G6)X is the composite optical focal length along the X direction of the first cylindrical lens group (G1) to the third spherical lens group (G6), f(G1-G6)Y is the composite optical focal length along the Y direction of the first cylindrical lens group (G1) to the third spherical lens group (G6), and f(G5)X is the composite optical focal length along the X direction of the third cylindrical lens group (G5).

4. A widescreen anamorphic lens according to claim 1, wherein f(G1)Y is the composite optical focal length of the first cylindrical lens group (G1) along the Y direction, f(G4)Y is the composite optical focal length of the second cylindrical lens group (G4) along the Y direction, f(G2) is the composite optical focal length of the first spherical lens group (G2), f(G3) is the composite optical focal length of the second spherical lens group (G3), and f(G6) is the composite optical focal length of the third spherical lens group (G6).

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

3. 3. A widescreen anamorphic lens according to claim 2, characterized in that the tenth lens (10) constitutes an inner focal group.

4. 3. The widescreen anamorphic lens of claim 2, wherein the fourth lens (4) and the fifth lens (5) are bonded together to form a spherical doublet lens, and / or the seventh lens (7) and the eighth lens (8) 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 fourteenth lens (14) and the fifteenth lens (15) are bonded together to form a spherical doublet lens, and / or the seventeenth lens (17) is a negative power spherical lens and the seventeenth lens (17) and the sixteenth lens (16) are bonded together to form a spherical doublet lens, or the seventeenth lens (17) is a positive power spherical lens and the seventeenth lens (17) and the eighteenth lens (18) are bonded together to form a spherical doublet lens.

5. 2. The widescreen anamorphic lens according to claim 1, wherein the combined optical focal length of the widescreen anamorphic lens in the X direction is 85 mm to 135 mm.

6. 2. The widescreen anamorphic lens of claim 1, wherein the zoom ratio of the widescreen anamorphic lens is 1.1X-1.5X, and the magnification is constant at different object distances.

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

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

0.

9. 2. The widescreen anamorphic lens of claim 1, wherein the combined optical focal length of the widescreen anamorphic lens in the X direction is 98 mm, the zoom ratio of the widescreen anamorphic lens is 1.33X, and the magnification is constant at different object distances, and the aperture value of the widescreen anamorphic lens is 1.

8.

10. 2. The widescreen 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 second cylindrical lens group (G4), the third cylindrical lens group (G5), and the third spherical lens group (G6) are all optical glass lenses.

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