35mm breathing-eliminating full-frame camera lens

Abstract

The invention discloses a 35mm breathing-eliminating full-frame camera lens, and aims to solve the problems that in the prior art, when a visual angle is slightly enlarged or shrunk due to focus change, unnecessary jitter of a picture is caused, the fluency and ornamental value of a video are influenced, and the visual angle is slightly enlarged or shrunk. The lens comprises a variable diaphragm, and a first lens group, a second lens group and a third lens group which are sequentially arranged from an object side to an image side, the first lens group is composed of seven lenses and serves as a fixed group of the camera lens, and the focal power is positive; the iris diaphragm is located between the first lens group and the second lens group; the second lens group is composed of three lenses and serves as a focusing group of the camera lens, and the focal power is positive; the third lens group is composed of two lenses and serves as a fixed group of the camera lens, and the focal power is negative.

Description

Technical Field

[0001] The invention belongs to the technical field of camera lenses, and in particular relates to a 35mm breath-free full-frame camera lens. Background Art

[0002] With the rapid development of social media platforms and the popularity of short video content, more and more users tend to record their daily lives and share them with others by shooting daily Vlogs (video blogs). This trend has led to a growing demand for high-performance, portable photography equipment, especially for those who want mirrorless cameras that can be easily carried and operated without compromising image quality. Video bloggers not only pursue high quality of still images, but also pay special attention to the expressiveness and stability of video content to ensure that viewers can get the best viewing experience.

[0003] In the existing technology, the micro-single lens product line mainly focuses on optimizing the quality of static images, such as providing large aperture to achieve shallow depth of field, reducing distortion to ensure image edge clarity, and improving resolution to ensure detail reproduction. These lenses meet the needs of photographers for photo shooting, thus providing excellent performance in terms of image quality.

[0004] The prior art has the following technical problems:

[0005] 1. Existing lenses fail to fully consider the characteristics and requirements of dynamic images during video shooting. For example, the "breathing effect" that occurs when adjusting the focus - that is, the phenomenon of slightly enlarging or reducing the viewing angle due to the change in focus - will cause unnecessary jitter in the picture, affecting the smoothness and viewing quality of the video.

[0006] 2. Existing lenses lack stability and consistency during video recording, resulting in the final output video quality not meeting the standards of professional-level videos. Summary of the invention

[0007] In view of the technical problems that the above-mentioned prior art fails to fully consider the characteristics and requirements of dynamic images during the video shooting process, when the viewing angle is slightly enlarged or reduced due to the focus change, it will cause unnecessary shaking of the picture, affecting the smoothness and viewing experience of the video, and the existing lenses lack stability and consistency during video recording, the present invention provides a 35mm anti-breathing full-frame camera lens.

[0008] The technical solution adopted by the present invention is as follows:

[0009] A 35mm full-frame camera lens with anti-breathing, comprising: a variable aperture, and a first lens group, a second lens group and a third lens group arranged in sequence from the object side to the image side;

[0010] The first lens group is composed of seven lenses, serving as a fixed group of the camera lens, and has positive optical power; the first lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens arranged in sequence from the object side to the image side;

[0011] The variable aperture is located between the first lens group and the second lens group;

[0012] The second lens group is composed of three lenses, serving as a focusing group of the camera lens, and has a positive optical power; the second lens group includes an eighth lens, a ninth lens, and a tenth lens arranged in sequence from the object side to the image side;

[0013] The third lens group is composed of two lenses and serves as a fixed group of the camera lens, and has negative optical power; the third lens group includes an eleventh lens and a twelfth lens arranged in sequence from the object side to the image side.

[0014] By adopting the above technical solution, the beneficial effects of the present invention are as follows: the present invention adopts a 35mm focal length design, provides a standard viewing angle, and is suitable for a variety of shooting scenes. The lens is divided into three lens groups (fixed group, focus group, fixed group), which simplifies the overall structure, improves the tolerance, and ensures the imaging quality at different shooting distances. Placing the variable aperture between the first lens group and the second lens group helps to balance the light distribution, reduce aberrations, and improve image quality.

[0015] Furthermore, the first lens is a negative lens, the second lens is a positive lens, the third lens is a negative lens, the fourth lens is a positive lens, the fifth lens is a positive lens, the sixth lens is a negative lens, and the seventh lens is a positive lens; the eighth lens is a negative lens, the ninth lens is a positive lens, and the tenth lens is a positive lens; the eleventh lens is a negative lens; and the twelfth lens is a positive lens.

[0016] By adopting the above technical solution, the beneficial effect of the present invention is as follows: the present invention can effectively correct chromatic aberration and other optical aberrations and improve image clarity by arranging positive and negative lenses in a specific order.

[0017] Further, the first lens is a biconcave negative lens, and the first radius of curvature of the first lens and the second radius of curvature of the first lens satisfy the relationship: -1.5<(L1 R2+L1 R1) / (L1 R2-L1 R1)<0.5;

[0018] Wherein, L1 R1 represents the first radius of curvature, and L1 R2 represents the second radius of curvature;

[0019] Among them, the first radius of curvature is the radius of curvature of the object side surface of the first lens, and the second radius of curvature is the radius of curvature of the image side surface of the first lens.

[0020] Adopting the above technical solution, the beneficial effects of the present invention are as follows: The first lens of the present invention is a negative lens with a double concave shape. Combining with its relational formula of the radius of curvature, it can reduce spherical aberration and improve the sharpness of the central area while ensuring sufficient negative optical power.

[0021] Further, the second lens is a meniscus positive lens bent towards the object side, and the focal length FG1 of the second lens and the total effective focal length f of the camera lens satisfy the relational formula: 2.30 < FG1 / f < 4.25.

[0022] Adopting the above technical solution, the beneficial effects of the present invention are as follows: The second lens of the present invention is a meniscus positive lens bent towards the object side. Combining with its relational formula of the focal length, it can reduce coma aberration and field curvature while maintaining appropriate positive optical power.

[0023] Further, the first lens group includes a first doublet lens and a second doublet lens arranged from the object side to the image side. The fourth radius of curvature B1R2 of the first doublet lens and the fifth radius of curvature B2R1 of the second doublet lens satisfy the relational formula: -6.74 < B1R2 / B2R1 < -4.43. The third radius of curvature B1R1 of the first doublet lens and the sixth radius of curvature B2R2 of the second doublet lens satisfy the relational formula: 5.53 < B2R2 / B1R1 < 8.19;

[0024] Among them, the third radius of curvature and the fourth radius of curvature are the radii of curvature of the object side surface and the image side surface of the first doublet lens respectively; the fifth radius of curvature and the sixth radius of curvature are the radii of curvature of the object side surface and the image side surface of the second doublet lens respectively.

[0025] Adopting the above technical solution, the beneficial effects of the present invention are as follows: The first lens group of the present invention includes two doublet lenses. Through the design of a specific ratio of the radius of curvature, it can effectively correct chromatic aberration and astigmatism, and improve the overall quality of the image. It makes the performance of the lens more consistent at different wavelengths and reduces the influence of chromatic aberration.

[0026] Further, the second lens group includes a biconvex positive lens with a biconvex shape, and the dispersion coefficient of the biconvex positive lens is greater than 68.

[0027] Adopting the above technical solution, the beneficial effects of the present invention are as follows: The second lens group of the present invention includes a biconvex positive lens, and its dispersion coefficient is greater than 68, which helps to significantly reduce chromatic aberration and improve color reproduction.

[0028] Furthermore, the focal length FG2 of the biconvex positive lens and the total effective focal length f of the camera lens satisfy the relationship: 0.68 <FG2 / f<1.61。

[0029] By adopting the above technical scheme, the beneficial effects of the present invention are as follows: the ratio of the focal length of the double convex positive lens of the present invention to the total effective focal length ensures the flexibility and accuracy of the focusing group when adjusting the focus, and supports a smooth transition from close-up to telephoto.

[0030] Furthermore, the tenth lens is a positive meniscus lens bent toward the object side, and the focal length FG3 of the tenth lens and the total effective focal length f of the camera lens satisfy the relationship: 1.73 <FG3 / f<3.53。

[0031] By adopting the above technical solution, the beneficial effect of the present invention is as follows: the tenth lens of the present invention is a positive meniscus lens bent toward the object side, and combined with its focal length relationship, it can reduce coma aberration and field curvature while maintaining appropriate positive focal power.

[0032] Furthermore, the total effective focal length f of the camera lens and the focal length FG4 of the second lens group satisfy the relationship: 0.89 <FG4 / f<1.81。

[0033] By adopting the above technical scheme, the beneficial effects of the present invention are as follows: the ratio of the focal length of the second lens group of the present invention to the total effective focal length ensures the flexibility and accuracy of the focusing group when adjusting the focus, and supports a smooth transition from close-up to telephoto.

[0034] Furthermore, the focal length FG5 of the first lens group and the focal length FG6 of the third lens group satisfy the relationship: 0.73 <FG1 / FG3<1.71。

[0035] By adopting the above technical solution, the beneficial effects of the present invention are as follows: the ratio of the focal length of the first lens group to the focal length of the third lens group ensures the imaging quality of the entire system, especially at the wide-angle end. The strong negative focal length of the third lens group helps to correct any residual aberration caused by the first two groups, thereby ensuring the imaging quality of the entire system.

[0036] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0037] 1. The lens of the present invention is designed to be short and lightweight, which is not only easy to carry, but also reduces the burden on the photographer during long-term shooting and improves comfort.

[0038] 2. The invention provides excellent low-light performance, capable of capturing clear and bright images in low-light environments. At the same time, the large aperture helps create a shallow depth of field effect, highlighting the subject and enhancing visual appeal. And the distortion is less than 3%, ensuring the linearity and authenticity of the image edge, especially suitable for occasions requiring high precision such as architectural photography and landscape photography.

[0039] 3. The present invention divides the system into three independent lens groups. This design not only simplifies the overall structure, but also improves the tolerance, ensuring the stability and consistency of the lens during the production process.

[0040] 4. The present invention uses low-wavelength and high-transmittance glass materials, which can effectively reduce chromatic aberration, improve color reproduction, and ensure that the colors of the captured images are more realistic and natural, and is particularly suitable for professional applications that require high color accuracy.

[0041] 5. The present invention is specially optimized for video recording, especially solving the "breathing effect" problem when adjusting the focus, that is, the phenomenon of slight enlargement or reduction of the viewing angle caused by the change of focus. This greatly reduces the jitter of the picture and improves the smoothness and viewing quality of the video.

[0042] 6. The present invention uses aspherical glass lenses in the moving group, which not only significantly reduces the size and weight of the moving group, but also further optimizes the optical performance and reduces aberrations. The application of aspherical lenses makes the load of the focus motor smaller, improves the focusing speed and accuracy, and ensures efficient autofocus performance, which is particularly important in a fast-changing shooting environment.

[0043] 7. The lens of the present invention is specially designed to meet the needs of professional video creators, ensuring stability and consistency during video recording, meeting high-standard professional requirements; and taking into account the capabilities of both static image and dynamic video shooting needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative work, among which:

[0045] Figure 1 is a schematic structural diagram of a 35mm breath-free full-frame camera lens provided according to an embodiment of the present invention;

[0046] Figure 2 is a spherical aberration curve diagram provided according to an embodiment of the present invention;

[0047] Figure 3is a field curvature curve diagram provided according to an embodiment of the present invention;

[0048] Figure 4 is a distortion curve diagram provided according to an embodiment of the present invention.

[0049] Reference numerals: G1-first lens group, G2-second lens group, G3-third lens group, STP-variable aperture, 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. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention, that is, the embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0051] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative work are within the scope of protection of the present invention.

[0052] It should be noted that relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0053] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0054] like Figure 1As shown, a 35mm full-frame camera lens with anti-breathing provided by an embodiment of the present invention comprises: a variable aperture STP, and a first lens group G1, a second lens group G2 and a third lens group G3 arranged in sequence from the object side to the image side;

[0055] The first lens group G1 is composed of seven lenses, serving as a fixed group of the camera lens, and has a positive optical power; the first lens group G1 includes a first lens 1, a second lens 2, a third lens 3, 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;

[0056] The variable aperture STP is located between the first lens group G1 and the second lens group G2;

[0057] The second lens group G2 is composed of three lenses and serves as a focusing group of the camera lens, and has a positive optical power; the second lens group G2 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;

[0058] The third lens group G3 is composed of two lenses and serves as a fixed group of the camera lens, and has negative optical power. The third lens group G3 includes an eleventh lens 11 and a twelfth lens 12 which are sequentially arranged from the object side to the image side.

[0059] In summary, the present invention adopts a 35mm focal length design, provides a standard viewing angle, and is suitable for a variety of shooting scenes. The lens is divided into three lens groups (fixed group, focus group, fixed group), which simplifies the overall structure, improves the tolerance, and ensures the imaging quality at different shooting distances. Placing the variable aperture STP between the first lens group G1 and the second lens group G2 helps to balance the light distribution, reduce aberrations, and improve image quality.

[0060] Optionally, the first lens 1 is a negative lens, the second lens 2 is a positive lens, the third lens 3 is a negative lens, the fourth lens 4 is a positive lens, the fifth lens 5 is a positive lens, the sixth lens 6 is a negative lens, and the seventh lens 7 is a positive lens; the eighth lens 8 is a negative lens, the ninth lens 9 is a positive lens, and the tenth lens 10 is a positive lens; the eleventh lens 11 is a negative lens; and the twelfth lens 12 is a positive lens.

[0061] In summary, the present invention can effectively correct chromatic aberration and other optical aberrations and improve image clarity by arranging positive and negative lenses in a specific order.

[0062] Optionally, the first lens 1 is a negative lens with a biconcave shape, and the first curvature radius and the second curvature radius of the first lens 1 satisfy the relational expression: -1.5 < (L1R2 + L1R1) / (L1R2 - L1R1) < 0.5;

[0063] Wherein, L1R1 represents the first curvature radius, and L1R2 represents the second curvature radius;

[0064] Wherein, the first curvature radius is the curvature radius of the object side surface of the first lens 1, and the second curvature radius is the curvature radius of the image side surface of the first lens 1.

[0065] In summary, the first lens 1 of the present invention adopts a negative lens with a biconcave shape. Combining with the relational expression of its curvature radius, it can reduce spherical aberration and improve the sharpness of the central region while ensuring sufficient negative optical power.

[0066] Optionally, the second lens 2 is a meniscus positive lens bent towards the object side, and the focal length FG1 of the second lens 2 and the total effective focal length f of the camera lens satisfy the relational expression: 2.30 < FG1 / f < 4.25.

[0067] In summary, the second lens 2 of the present invention is a meniscus positive lens bent towards the object side. Combining with its focal length relational expression, it can reduce coma aberration and field curvature while maintaining appropriate positive optical power.

[0068] Optionally, the first lens group G1 includes a first doublet lens and a second doublet lens arranged from the object side to the image side. The fourth curvature radius B1R2 of the first doublet lens and the fifth curvature radius B2R1 of the second doublet lens satisfy the relational expression: -6.74 < B1R2 / B2R1 < -4.43. The third curvature radius B1R1 of the first doublet lens and the sixth curvature radius B2R2 of the second doublet lens satisfy the relational expression: 5.53 < B2R2 / B1R1 < 8.19;

[0069] Wherein, the third curvature radius and the fourth curvature radius are respectively the curvature radii of the object side surface and the image side surface of the first doublet lens; the fifth curvature radius and the sixth curvature radius are respectively the curvature radii of the object side surface and the image side surface of the second doublet lens.

[0070] In summary, the first lens group G1 of the present invention includes two doublet lenses. Through the design of a specific curvature radius ratio, chromatic aberration and astigmatism can be effectively corrected, and the overall quality of the image can be improved. The performance of the lens at different wavelengths is more consistent, and the influence of chromatic aberration is reduced.

[0071] Optionally, the second lens group G2 includes a biconvex positive lens of a biconvex shape, the aberration coefficient of the biconvex positive lens is greater than 68, and the focal length FG2 of the biconvex positive lens and the total effective focal length f of the camera lens satisfy the relationship: 0.68 <FG2 / f<1.61。

[0072] In this embodiment, the biconvex positive lens is the ninth lens 9.

[0073] In summary, the second lens group G2 of the present invention includes a biconvex positive lens, whose dispersion coefficient is greater than 68, which helps to significantly reduce chromatic aberration and improve color reproduction. The ratio of the focal length of the biconvex positive lens to the total effective focal length ensures the flexibility and accuracy of the focus group when adjusting the focus, and supports a smooth transition from close-up to telephoto.

[0074] Optionally, the tenth lens 10 is a positive meniscus lens bent toward the object side, and the focal length FG3 of the tenth lens 10 and the total effective focal length f of the camera lens satisfy the relationship: 1.73 <FG3 / f<3.53。

[0075] In summary, the tenth lens element 10 of the present invention is a positive meniscus lens that is bent toward the object side. Combined with the focal length relationship, it is possible to reduce coma aberration and field curvature while maintaining an appropriate positive focal power.

[0076] Optionally, the total effective focal length f of the camera lens and the focal length FG4 of the second lens group G2 satisfy the relationship: 0.89 <FG4 / f<1.81。

[0077] In summary, the ratio of the focal length of the second lens group G2 to the total effective focal length of the present invention ensures the flexibility and accuracy of the focusing group when adjusting the focus, and supports a smooth transition from close-up to telephoto.

[0078] Optionally, the focal length FG5 of the first lens group G1 and the focal length FG6 of the third lens group G3 satisfy the relationship: 0.73 <FG1 / FG3<1.71。

[0079] In summary, the ratio of the focal length of the first lens group G1 to the focal length of the third lens group G3 of the present invention ensures the imaging quality of the entire system, especially at the wide-angle end. The strong negative focal length of the third lens group G3 helps to correct any remaining aberrations caused by the first two groups, ensuring the imaging quality of the entire system.

[0080] In a specific implementation process, the curvature radius, thickness, refractive index and dispersion coefficient of each lens surface from the object side (the side of the object to be photographed) to the image side (the side of the image sensor or film) are shown in Table 1:

[0081]

[0082]

[0083] Table 1

[0084] Radius of curvature (mm): Indicates the curvature of the lens surface. Positive values ​​represent convex surfaces, and negative values ​​represent concave surfaces.

[0085] Thickness (mm): refers to the distance between two adjacent surfaces, that is, the thickness of the lens or air gap.

[0086] Refractive Index: The ability of a material to bend light, used to calculate the change in direction of light as it passes through a lens.

[0087] Dispersion coefficient (Abbe number): A numerical value that describes the dispersion characteristics of a material. The larger the value, the smaller the color difference.

[0088] Regarding the aspherical positive lens, the aspherical coefficients of its surface are shown in Table 2:

[0089] Surface serial number 22 23 k 8.117 31.345 A4 -1.724e-05 -9.236e-06 A6 -1.569e-07 -1.261e-07 A8 8.395e-10 6.953e-10 A10 -4.535e-12 -2.609e-12 A12 6.331e-15 3.753e-15

[0090] Table 2

[0091] k: Conic constant, used to adjust the aspherical shape.

[0092] A4,A6,A8,A10,A12: Higher-order aspheric coefficients that affect the precise shape of the lens surface to optimize optical performance.

[0093] At different focusing distances, the specific values ​​of D1 and D2 in Table 1 are shown in Table 3:

[0094] Conjugate distance Infinity Closest (0.35m) D1 13.35mm 10.42mm D2 2.22mm 5.15mm

[0095] Table 3

[0096] Infinity: The size of each spacing when the lens is focused at infinity.

[0097] Minimum (0.35m): The size of each spacing when the lens is focused at the minimum working distance (such as 0.35 meters).

[0098] In summary, the key specifications of a 35mm full-frame camera lens with no breathing in this embodiment are shown in Table 4:

[0099] Focal length f 34.98mm Relative aperture FNO. 1.85 Field of viewω 64.8° Total optical length 106mm

[0100] Table 4

[0101] Figure 2The spherical aberration curve diagram provided by the embodiment of the present invention, as can be seen from the figure, wherein the horizontal axis: represents the spherical aberration (unit is millimeter, mm). The vertical axis: represents light of different wavelengths. The dotted line (dash-dot line) represents the light of 486nm wavelength (blue light). The solid line represents the light of 588nm wavelength (yellow light). The dotted line represents the light of 656nm wavelength (red light).

[0102] As can be seen from the figure, the fluctuation range of spherical aberration of the three different wavelengths of light is relatively small, and there is an obvious convergence trend near 0mm. This shows that the spherical aberration of the lens at different wavelengths is very well controlled, reducing blur and distortion in the image.

[0103] The performance of different wavelengths of light (blue, yellow, and red) in spherical aberration is very similar, indicating that the lens does a good job in correcting chromatic aberration. This means that different colors of light can be focused on the same plane, improving the overall clarity and color reproduction of the image.

[0104] Due to the proper control of spherical aberration, the lens is able to maintain high resolution and sharpness at different wavelengths. This is very important for taking high-quality photos and videos, especially in scenes that require high details and clarity.

[0105] Figure 3 A field curvature graph provided by an embodiment of the present invention, wherein the horizontal axis represents field curvature (in millimeters, mm). The vertical axis represents the position of different field angles. The solid line represents the S (sagittal) direction. The dotted line represents the T (tangential) direction.

[0106] As can be seen from the figure, the focus of the radial and tangential rays of the internal incident light is basically kept in one plane throughout the image field. This shows that the field curvature of the lens in different directions is very well controlled, reducing blur and distortion in the image.

[0107] Thanks to the well-controlled field curvature, the lens is able to maintain high resolution and sharpness across the entire image, which is very important for taking high-quality photos and videos, especially in scenes that require high details and clarity.

[0108] Figure 4 This is a distortion curve diagram provided by an embodiment of the present invention, wherein the horizontal axis represents distortion (in percentage, %) and the vertical axis represents positions at different viewing angles.

[0109] As can be seen from the figure, the distortion at the maximum field of view is less than 3%. This shows that the distortion of the lens at different field angles is very well controlled, reducing deformation and distortion in the image.

[0110] The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions and improvements made by any technician familiar with the field within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A 35mm full-frame camera lens with zero breathing, characterized in that: Comprising: A variable aperture, and a first lens group, a second lens group, and a third lens group sequentially arranged from the object side to the image side; The first lens group is composed of seven lenses and serves as the fixed group of the camera lens, with a positive optical power; the first lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens sequentially arranged from the object side to the image side; The variable aperture is located between the first lens group and the second lens group; The second lens group is composed of three lenses and serves as the focusing group of the camera lens, with a positive optical power; the second lens group includes an eighth lens, a ninth lens, and a tenth lens sequentially arranged from the object side to the image side; The third lens group is composed of two lenses and serves as the fixed group of the camera lens, with a negative optical power; the third lens group includes an eleventh lens and a twelfth lens sequentially arranged from the object side to the image side.

2. A 35mm full-frame camera lens with zero breathing according to claim 1, characterized in that: The first lens is a negative lens, the second lens is a positive lens, the third lens is a negative lens, the fourth lens is a positive lens, the fifth lens is a positive lens, the sixth lens is a negative lens, and the seventh lens is a positive lens; The eighth lens is a negative lens, the ninth lens is a positive lens, the tenth lens is a positive lens; the eleventh lens is a negative lens; the twelfth lens is a positive lens.

3. A 35mm breath-free full-frame camera lens according to claim 1, characterized in that: The first lens is a negative lens with a biconcave shape, and the first curvature radius and the second curvature radius of the first lens satisfy the relation: -1.5 < (L1R2 + L1R1) / (L1R2 - L1R1) < 0.5; Wherein, L1R1 represents the first curvature radius, and L1R2 represents the second curvature radius; Wherein, the first curvature radius is the curvature radius of the object side surface of the first lens, and the second curvature radius is the curvature radius of the image side surface of the first lens.

4. A 35mm full-frame camera lens with zero breathing according to claim 1, characterized in that: The second lens is a meniscus positive lens bent towards the object side, and the focal length FG1 of the second lens and the total effective focal length f of the camera lens satisfy the relation: 2.30 < FG1 / f < 4.

25.

5. The 35mm full-frame camera lens with zero breathing according to claim 1, characterized in that: The first lens group includes a first doublet lens and a second doublet lens arranged from the object side to the image side, and the fourth curvature radius B1R2 of the first doublet lens and the fifth curvature radius B2R1 of the second doublet lens satisfy the relation: -6.74 < B1R2 / B2R1 < -4.43, and the third curvature radius B1R1 of the first doublet lens and the sixth curvature radius B2R2 of the second doublet lens satisfy the relation: 5.53 < B2R2 / B1R1 < 8.19; Wherein, the third curvature radius and the fourth curvature radius are respectively the curvature radii of the object side surface and the image side surface of the first doublet lens; the fifth curvature radius and the sixth curvature radius are respectively the curvature radii of the object side surface and the image side surface of the second doublet lens.

6. A 35mm full-frame camera lens with zero breathing according to claim 1, characterized in that: The second lens group includes a biconvex positive lens with a biconvex shape, and the dispersion coefficient of the biconvex positive lens is greater than 68.

7. A 35mm full-frame camera lens with zero breathing according to claim 6, characterized in that: The focal length FG2 of the biconvex positive lens and the total effective focal length f of the camera lens satisfy the relationship: 0.68 <FG2 / f<1.61。 8. The 35mm anti-breathing full-frame camera lens according to claim 1, characterized in that: The tenth lens is a positive meniscus lens bent toward the object side, and the focal length FG3 of the tenth lens and the total effective focal length f of the camera lens satisfy the relationship: 1.73 <FG3 / f<3.53。 9. The 35mm anti-breathing full-frame camera lens according to claim 1, characterized in that: The total effective focal length f of the camera lens and the focal length FG4 of the second lens group satisfy the relationship: 0.89 <FG4 / f<1.81。 10. The 35mm full-frame camera lens with zero breathing according to claim 1, characterized in that: The focal length FG5 of the first lens group and the focal length FG6 of the third lens group satisfy the relationship: 0.73 <FG1 / FG3<1.71。

Images