Small vehicle-mounted rearview mirror lens with high resolving power and high light transmission

Abstract

The invention discloses a high-resolution large-light-flux small vehicle-mounted rearview lens, which sequentially comprises a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 from an object side to an image side along an optical axis, and the total focal length of an optical system is f, the focal lengths of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are f1, f2, f3, f4, f5 and f6 respectively, and f1, f2, f3, f4, f5, f6 and f meet the following proportions:-1.4 < = f1 / f < =-1.03, 0.9 < = f2 / f < = 2.2,-0.7 < = f3 / f < = 1.6, 0.8 < = f4 / f < = 0.95,-0.7 < = f5 / f < = 1.55, and-4.2 < = f6 / f < = 1.71. According to the lens, optimization of optical performance and miniaturization of the lens are realized; the lens of the invention has the performance of high resolution and large light transmission.

Description

Technical Field

[0001] The invention belongs to the technical field of optical lenses, and in particular relates to a small vehicle-mounted rearview lens with high resolution and large light transmission. Background Art

[0002] In recent years, the automotive industry has developed rapidly, and the concepts of assisted and autonomous driving have emerged. As a key component in this field, the importance of vehicle-mounted cameras has become increasingly prominent, and vehicle-mounted lenses, as core components, play a vital role. Among them, rearview lenses are widely used in parking assistance systems, which greatly improves the convenience and safety of driving. With the wide adaptation and popularization of rearview lenses in various types of vehicles, users' requirements for the performance and quality of such lenses have also risen. At the same time, given the increasingly complex trend of vehicle-mounted systems, the installation space of vehicle-mounted lenses has been significantly compressed. In order to comply with the development trend of lens miniaturization, the current mainstream vehicle-mounted rearview lens design on the market often needs to compromise between image quality, resolution and cost control. The common vehicle-mounted rearview lenses on the market generally achieve the goal of lens miniaturization by sacrificing resolution, reducing the aperture or increasing material costs. In view of this, it is particularly important to develop a miniaturized, high-light, high-resolution vehicle-mounted rearview lens. Summary of the invention

[0003] In view of the deficiencies of the prior art, the present invention provides a small vehicle-mounted rearview lens with high resolution and large light transmission.

[0004] To achieve the above object, the present invention provides the following technical solution: A small-sized vehicle-mounted rearview lens with high resolution and large light transmission, comprising, in order from the object side to the image side along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6, wherein: The first lens L1 is a double concave negative lens or a positive meniscus lens with a convex object side surface; The second lens L2, the fourth lens L4 and the fifth lens L5 are all biconvex positive lenses; The third lens L3 is a double concave negative lens; The sixth lens L6 is a positive meniscus lens, and its object side surface is convex; The fourth lens L4 is closely attached to the third lens L3 or the fifth lens L5 to form a lens cemented group, and the aperture C is arranged on the object side of the lens cemented group. The total focal length of the optical system is f, and the focal lengths of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are f1, f2, f3, f4, f5, f6, respectively, wherein f1, f2, f3, f4, f5, f6 and f satisfy the following ratios: -1.4≤f1 / f≤-1.03, 0.9≤f2 / f≤2.2, -0.7≤f3 / f≤1.6, 0.8≤f4 / f≤0.95, -0.7≤f5 / f≤1.55, and -4.2≤f6 / f≤1.71.

[0005] As a specific implementation, when the first lens L1 is a double concave negative lens, and the third lens L3 and the fourth lens L4 are closely connected to form a lens cemented group, the aperture C is arranged between the second lens L2 and the third lens L3; When the first lens L1 is a positive meniscus lens, and the third lens L3 and the fourth lens L4 are closely connected to form a lens cemented group, the aperture C is arranged between the second lens L2 and the third lens L3; When the first lens L1 is a positive meniscus lens, and the fourth lens L4 and the fifth lens L5 are closely contacted to form a lens cemented group, the aperture C is arranged between the third lens L3 and the fourth lens L4.

[0006] As a specific implementation, the distance between the aperture C and the adjacent lens behind it is D; the total optical length of the optical system is TTL, and the following condition is satisfied between D and TTL: 0.015≤D / TTL≤0.15.

[0007] As a specific implementation, the third lens L3 also satisfies the following condition: -0.51≤R 32 / (R 31 -R 32 )≤0.55; where R 31 R represents the radius of curvature of the object side of the third lens L3; 32 It represents the curvature radius of the image side of the third lens L3.

[0008] As a specific implementation, the maximum image circle of the optical system is IC, the total optical length of the optical system is TTL, and IC and TTL satisfy the following condition: 0.35≤IC / TTL≤0.45.

[0009] As a specific implementation, the refractive index N of the second lens L2 is d2 Satisfy N d2 ≥1.9.

[0010] As a specific implementation, when the first lens L1 is a meniscus positive lens, and the third lens L3 and the fourth lens L4 are in close contact to form a lens cementation group, the air distance from the first lens L1 to the second lens L2 is 0.7698 mm; the air distance from the second lens L2 to the aperture C is -0.0005 mm; the air distance from the aperture C to the third lens L3 is 0.34 mm; the air distance from the fourth lens L4 to the fifth lens L5 is 0.1 mm; the air distance from the fifth lens L5 to the sixth lens L6 is 3.2897 mm; and the air distance from the sixth lens L6 to the image plane IMG is 3.1063 mm.

[0011] As a specific implementation, when the first lens L1 is a meniscus positive lens, and the fourth lens L4 and the fifth lens L5 are in close contact to form a lens cemented group, the air distance from the first lens L1 to the second lens L2 is 1.0071 mm; the air distance from the second lens L2 to the third lens L3 is 0.4163 mm; the air distance from the third lens L3 to the aperture C is -0.4773 mm; the air distance from the aperture C to the fourth lens L4 is 0.5767 mm; the air distance from the fifth lens L5 to the sixth lens L6 is 0.7148 mm; and the air distance from the sixth lens L6 to the image plane IMG is 2.8249 mm.

[0012] As a specific implementation, when the first lens L1 is a double concave negative lens, and the third lens L3 and the fourth lens L4 are in close contact to form a lens cemented group, the air distance from the first lens L1 to the second lens L2 is 3.1053 mm; the air distance from the second lens L2 to the aperture C is 0.0816 mm; the air distance from the aperture C to the third lens L3 is 0.6887 mm; the air distance from the fourth lens L4 to the fifth lens L5 is 0.0962 mm; the air distance from the fifth lens L5 to the sixth lens L6 is 0.4263 mm; and the air distance from the sixth lens L6 to the image plane IMG is 5.8417 mm.

[0013] Compared with the prior art, the present invention provides a small vehicle-mounted rearview lens with high resolution and large light transmission, which has the following beneficial effects: 1) The present invention optimizes the optical performance and miniaturizes the lens by rationally planning the layout of each lens in the optical system and setting the refractive index of the second lens L2 to be greater than or equal to 1.9; 2) The present invention achieves the requirement of clear imaging within a larger imaging target surface by reasonably allocating the focal length of the lens, and by reasonably adjusting the distance between the aperture and the adjacent lens behind, and reasonably adjusting the curvature of the third lens L3, and then adjusting the shape of the lens to meet the requirement of large light transmission; 3) The present invention achieves the requirement of high stability during the use of the lens by selecting an all-glass structure; 4) In the present invention, by setting the ratio of the maximum image circle of the optical system to the total optical length of the optical system and reasonably controlling the optical power of the fifth lens L5, the total optical length TTL of the optical system is made ≤ 21.1 mm, thereby realizing miniaturization of the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the optical structure of a small vehicle-mounted rearview lens with high resolution and large light transmission proposed by the present invention; Figure 2 This is the optical path diagram of the small vehicle-mounted rearview lens with high resolution and large light transmission in Example 1; Figure 3 The MTF curve of the small vehicle-mounted rearview lens with high resolution and large light transmission in the visible light range in Example 1; Figure 4 The lateral chromatic aberration curve of the small vehicle-mounted rearview lens with high resolution and large light transmission in the visible light range in Example 1; Figure 5 This is a longitudinal aberration diagram of the small vehicle-mounted rearview lens with high resolution and large light transmission in the visible light range in Example 1; Figure 6 This is the optical path diagram of the small vehicle-mounted rearview lens with high resolution and large light transmission in Example 2; Figure 7 The MTF curve diagram of the small vehicle-mounted rearview lens with high resolution and large light transmission in the visible light range in Example 2; Figure 8 The lateral chromatic aberration curve of the small vehicle-mounted rearview lens with high resolution and large light transmission in the visible light range in Example 2; Fig. 9 This is a longitudinal aberration diagram of the small vehicle-mounted rearview lens with high resolution and large light transmission in the visible light range in Example 2; Fig.10 This is the optical path diagram of the small vehicle-mounted rearview lens with high resolution and large light transmission in Example 3; Fig.11 The MTF curve diagram of the small vehicle-mounted rearview lens with high resolution and large light transmission in the visible light range in Example 3; Fig.12 The lateral chromatic aberration curve of the small vehicle-mounted rearview lens with high resolution and large light transmission in the visible light range in Example 3; Fig.13 This is a longitudinal aberration diagram of the small vehicle-mounted rearview lens with high resolution and large light transmission in Example 3. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] See also Figure 1 As shown, the present invention provides a small-sized vehicle rearview lens with high resolution and large light transmission, which comprises, in order from the object side to the image side along the optical axis: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6, wherein the first lens L1 is a double concave negative lens or a positive meniscus lens with a convex object side surface; the second lens L2, the fourth lens L4 and the fifth lens L5 are all double convex positive lenses; the third lens L3 is a double concave negative lens; the sixth lens L6 is a positive meniscus lens with a convex object side surface; the fourth lens L4 is in close contact with the third lens L3 or the fifth lens L5 to form a lens cementation group, and the aperture C is arranged on the object side of the lens cemented group. The total focal length of the optical system is f. The focal lengths of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are f1, f2, f3, f4, f5 and f6 respectively. Among them, f1, f2, f3, f4, f5 and f6 satisfy the following ratios with f: -1.4≤f1 / f≤-1.03, 0.9≤f2 / f≤2.2, -0.7≤f3 / f≤1.6, 0.8≤f4 / f≤0.95, -0.7≤f5 / f≤1.55, and -4.2≤f6 / f≤1.71.

[0017] The lens materials in this optical system are all glass materials with regular refractive index. Example 1

[0018] The vehicle rearview lens in this example includes, in order from the object side to the image side along the optical axis: a first lens L1, a second lens L2, an aperture C, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6.

[0019] The first lens L1 is a positive meniscus lens, and its object side surface is convex; the second lens L2, the fourth lens L4 and the fifth lens L5 are all double convex positive lenses; the third lens L3 is a double concave negative lens; the sixth lens L6 is a positive meniscus lens, and its object side surface is convex. The third lens L3 and the fourth lens L4 are closely connected to form a lens cementation group. The optical path diagram of the lens is shown in Figure 2 shown.

[0020] See Table 1, which lists the relevant parameters of each lens in this example, including the radius of curvature, thickness, refractive index of the material, and Abbe number: Table 1

[0021] Infinity means infinity. The air distance from the first lens L1 to the second lens L2 is 0.7698mm; the air distance from the second lens L2 to the aperture C is -0.0005mm; the air distance from the aperture C to the third lens L3 is 0.34mm; the air distance from the fourth lens L4 to the fifth lens L5 is 0.1mm; the air distance from the fifth lens L5 to the sixth lens L6 is 3.2897mm; the air distance from the sixth lens L6 to the image plane IMG is 3.1063mm.

[0022] The technical indicators achieved by the optical system in this example are as follows: 1) Total focal length of the optical system: f = 5.2863 mm; 2) Focal length of the first lens L1: f1 = -5.50073 mm; 3) Focal length of the second lens L2: f2 = 5.959305 mm; 4) Focal length of the third lens L3: f3 = -3.268469 mm; 5) Focal length of the fourth lens L4: f4 = 4.961851 mm; 6) Focal length of the fifth lens L5: f5 = 7.387647 mm; 7) Focal length of the sixth lens L6: f6 = -15.505157 mm; 8) The distance between the aperture C and the third lens L3: D = 0.34 mm; 9) Total optical length of the optical system: TTL = 21.0003 mm; 10) The radius of curvature of the image side of the third lens L3: R 32 =5.9560mm; 11) The radius of curvature of the object side of the third lens L3: R 31 =-5.9560mm; 12) Maximum image circle of the optical system: IC = 7.8000mm; 13) Refractive index of the second lens L2: N d2 =1.92.

[0023] Then we get: f1 / f=-1.0406;f2 / f=1.1273;f3 / f=-0.6183;f4 / f=0.9386;f5 / f=1.3975;f6 / f=-2.9331;D / TTL=0.0162;R 32 / (R 31 -R 32 )=-0.5000; IC / TTL=0.3714.

[0024] Figures 3 to 5 is the optical performance curve of this embodiment, wherein Figure 3 This is the MTF curve of the optical system in the visible light band. It can be seen that at a spatial frequency of 60 pl / mm, its MTF value is greater than 0.25, indicating that the optical system has good imaging quality; Figure 4 This is the lateral chromatic aberration curve. It can be seen that the lateral chromatic aberration is less than 5.5μm, and the imaging quality is good; Figure 5 This is the longitudinal aberration curve. It can be seen that the longitudinal chromatic aberration is less than 0.07mm. Example 2

[0025] The vehicle rearview lens in this example includes, in order from the object side to the image side along the optical axis: a first lens L1, a second lens L2, a third lens L3, an aperture C, a fourth lens L4, a fifth lens L5 and a sixth lens L6.

[0026] In the optical system, the first lens L1 is a positive meniscus lens, and its object side surface is convex; the second lens L2, the fourth lens L4 and the fifth lens L5 are all double convex positive lenses; the third lens L3 is a double concave negative lens; the sixth lens L6 is a positive meniscus lens, and its object side surface is convex. The fourth lens L4 and the fifth lens L5 are closely connected to form a lens cemented group. The optical path diagram of this lens is shown in Figure 6 shown.

[0027] See Table 2, which lists the relevant parameters of each lens in this example, including the radius of curvature, thickness, refractive index of the material, and Abbe number: Table 2

[0028] In addition, the air distance from the first lens L1 to the second lens L2 is 1.0071 mm; the air distance from the second lens L2 to the third lens L3 is 0.4163 mm; the air distance from the third lens L3 to the aperture C is -0.4773 mm; the air distance from the aperture C to the fourth lens L4 is 0.5767 mm; the air distance from the fifth lens L5 to the sixth lens L6 is 0.7148 mm; and the air distance from the sixth lens L6 to the image plane IMG is 2.8249 mm.

[0029] The technical indicators achieved by the optical system in this example are as follows: 1) Total focal length of the optical system: f = 5.30247 mm; 2) Focal length of the first lens L1: f1 = -5.9572 mm; 3) Focal length of the second lens L2: f2 = 11.369851 mm; 4) Focal length of the third lens L3: f3 = 8.395805 mm; 5) Focal length of the fourth lens L4: f4 = 4.40546 mm; 6) Focal length of the fifth lens L5: f5 = -3.245044 mm; 7) Focal length of the sixth lens L6: f6 = 9.032906 mm; 8) The distance between the aperture C and the fourth lens L4: D = 0.5767; 9) Total optical length of the optical system: TTL = 21.0000mm; 10) The radius of curvature of the image side of the third lens L3: R 32 =-4.6171mm; 11) The radius of curvature of the object side of the third lens L3: R 31 =-13.4702mm; 12) Maximum image circle of the optical system: IC = 7.8000mm; 13) Refractive index of the second lens L2: N d2 =1.91.

[0030] Then we get: f1 / f=-1.1235;f2 / f=2.1443;f3 / f=1.5834;f4 / f=0.8308;f5 / f=-0.6120;f6 / f=1.7035;D / TTL=0.1338;R 32 / (R 31 -R 32 )=0.5215; IC / TTL=0.3714.

[0031] Figures 7 to 9 is the optical performance curve of this embodiment, wherein Figure 7 This is the MTF curve of the optical system in the visible light band. It can be seen that at the spatial frequency of 60pl / mm, its MTF value is not less than 0.5, indicating that the optical system has good imaging quality; Figure 8 This is the lateral chromatic aberration curve. It can be seen that the lateral chromatic aberration is less than 17μm; Fig. 9 This is the longitudinal aberration curve. It can be seen that the longitudinal chromatic aberration is less than 0.03mm. Example 3

[0032] The vehicle rearview lens in this example includes, in order from the object side to the image side along the optical axis: a first lens L1, a second lens L2, an aperture C, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6.

[0033] The first positive lens L1 is a double concave negative lens; the second lens L2, the fourth lens L4 and the fifth lens L5 are all double convex positive lenses; the third lens L3 is a double concave negative lens; the sixth lens L6 is a meniscus positive lens, and its object side surface is convex. The third lens L3 and the fourth lens L4 are closely connected to form a lens cementation group. The optical path diagram of this lens is shown in FIG. Fig.10 shown.

[0034] See Table 3, which lists the relevant parameters of each lens in this example, including the radius of curvature, thickness, refractive index of the material, and Abbe number: Table 3

[0035] In addition, the air distance from the first lens L1 to the second lens L2 is 3.1053 mm; the air distance from the second lens L2 to the aperture C is 0.0816 mm; the air distance from the aperture C to the third lens L3 is 0.6887 mm; the air distance from the fourth lens L4 to the fifth lens L5 is 0.0962 mm; the air distance from the fifth lens L5 to the sixth lens L6 is 0.4263 mm; and the air distance from the sixth lens L6 to the image plane IMG is 5.8417 mm.

[0036] The technical indicators achieved by the optical system in this example are as follows: 1) Total focal length of the optical system: f = 4.86138 mm; 2) Focal length of the first lens L1: f1 = -5.964702 mm; 3) Focal length of the second lens L2: f2 = 4.391854 mm; 4) Focal length of the third lens L3: f3 = -2.843896 mm; 5) Focal length of the fourth lens L4: f4 = 4.321707 mm; 6) Focal length of the fifth lens L5: f5 = 7.39604 mm; 7) Focal length of the sixth lens L6: f6 = -19.928012 mm; 8) The distance between the aperture C and the third lens L3: D = 0.6887 mm; 9) Total optical length of the optical system: TTL = 17.8033 mm; 10) The radius of curvature of the image side of the third lens L3: R 32 =4.4747mm; 11) The radius of curvature of the object side of the third lens L3: R 31 =-6.9405mm; 12) Maximum image circle of the optical system: IC = 7.8000mm; 13) Refractive index of the second lens L2: Nd2 =2.00.

[0037] Then we get: f1 / f=-1.2270;f2 / f=0.9034;f3 / f=-0.5850;f4 / f=0.8890;f5 / f=1.5214;f6 / f=-4.0993;D / TTL=0.0387;R 32 / (R 31 -R 32 )=-0.3920; IC / TTL=0.4381.

[0038] Figures 11 to 13 is the optical performance curve of this embodiment, wherein Fig.11 This is the MTF curve of the optical system in the visible light band. It can be seen that at the spatial frequency of 60pl / mm, its MTF value is greater than 0.55; Fig.12 This is the lateral chromatic aberration curve. It can be seen that the maximum lateral chromatic aberration does not exceed 4.5μm, and the imaging quality is good. Fig.13 This is the longitudinal aberration curve. It can be seen that the longitudinal chromatic aberration is less than 0.07mm.

[0039] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A small vehicle-mounted rearview lens with high resolution and large light transmission, characterized in that: The lens system includes, from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6, wherein: The first lens L1 is a double concave negative lens or a positive meniscus lens with a convex object side surface; The second lens L2, the fourth lens L4 and the fifth lens L5 are all biconvex positive lenses; The third lens L3 is a double concave negative lens; The sixth lens L6 is a positive meniscus lens, and its object side surface is convex; The fourth lens L4 is closely attached to the third lens L3 or the fifth lens L5 to form a lens cemented group, and the aperture C is arranged on the object side of the lens cemented group. The total focal length of the optical system is f, and the focal lengths of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are f1, f2, f3, f4, f5, f6, respectively, wherein f1, f2, f3, f4, f5, f6 and f satisfy the following ratios: -1.4≤f1 / f≤-1.03, 0.9≤f2 / f≤2.2, -0.7≤f3 / f≤1.6, 0.8≤f4 / f≤0.95, -0.7≤f5 / f≤1.55, and -4.2≤f6 / f≤1.

71.

2. A small-sized vehicle-mounted rearview lens with high resolution and large light transmission according to claim 1, characterized in that: The distance between the aperture C and its adjacent lens behind is D; The total optical length of the optical system is TTL, and the following condition is satisfied between D and TTL: 0.015≤D / TTL≤0.

15.

3. The small-sized vehicle-mounted rearview lens with high resolution and large light transmission according to claim 1, characterized in that: The third lens L3 also satisfies the following condition: -0.51≤R 32 / (R 31 -R 32 )≤0.55; where R 31 R represents the curvature radius of the object side of the third lens L3; 32 It represents the curvature radius of the image side of the third lens L3.

4. The small-sized vehicle-mounted rearview lens with high resolution and large light transmission according to claim 1, characterized in that: The maximum image circle of the optical system is IC, the total optical length of the optical system is TTL, and IC and TTL satisfy the following condition: 0.35≤IC / TTL≤0.

45.

5. The small-sized vehicle-mounted rearview lens with high resolution and large light transmission according to claim 1, characterized in that: The refractive index N of the second lens L2 d2 Satisfy N d2 ≥1.

9.

6. The small-sized vehicle-mounted rearview lens with high resolution and large light transmission according to claim 1, characterized in that: When the first lens L1 is a meniscus positive lens, and the third lens L3 and the fourth lens L4 are in close contact to form a lens cemented group, the air distance from the first lens L1 to the second lens L2 is 0.7698 mm; the air distance from the second lens L2 to the aperture C is -0.0005 mm; the air distance from the aperture C to the third lens L3 is 0.34 mm; the air distance from the fourth lens L4 to the fifth lens L5 is 0.1 mm; the air distance from the fifth lens L5 to the sixth lens L6 is 3.2897 mm; and the air distance from the sixth lens L6 to the image plane IMG is 3.1063 mm.

7. The small-sized vehicle-mounted rearview lens with high resolution and large light transmission according to claim 1, characterized in that: When the first lens L1 is a meniscus positive lens, and the fourth lens L4 and the fifth lens L5 are in close contact to form a lens cemented group, the air distance from the first lens L1 to the second lens L2 is 1.0071 mm; the air distance from the second lens L2 to the third lens L3 is 0.4163 mm; the air distance from the third lens L3 to the aperture C is -0.4773 mm; the air distance from the aperture C to the fourth lens L4 is 0.5767 mm; the air distance from the fifth lens L5 to the sixth lens L6 is 0.7148 mm; and the air distance from the sixth lens L6 to the image plane IMG is 2.8249 mm.

8. The small-sized vehicle-mounted rearview lens with high resolution and large light transmission according to claim 1, characterized in that: When the first lens L1 is a double concave negative lens, and the third lens L3 and the fourth lens L4 are in close contact to form a lens cemented group, the air distance from the first lens L1 to the second lens L2 is 3.1053 mm; the air distance from the second lens L2 to the aperture C is 0.0816 mm; the air distance from the aperture C to the third lens L3 is 0.6887 mm; the air distance from the fourth lens L4 to the fifth lens L5 is 0.0962 mm; the air distance from the fifth lens L5 to the sixth lens L6 is 0.4263 mm; and the air distance from the sixth lens L6 to the image plane IMG is 5.8417 mm.

Images