A full-frame lens

Abstract

The application discloses a full-frame lens, which comprises a first lens group with positive refractive power, a diaphragm, a second lens group with positive refractive power, a third lens group with negative refractive power and a fourth lens group with negative refractive power arranged in sequence along an optical axis from an object side to an image side; the first lens group, the second lens group and the fourth lens group are fixed groups; the third lens group moves along the optical axis to focus when the focal point deviates at different object distances; the first lens group comprises a first lens with positive refractive power, a second lens with negative refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power and a fifth lens with positive refractive power; the second lens group comprises a sixth lens with negative refractive power, a seventh lens with positive refractive power and an eighth lens with positive refractive power; the third lens group comprises a ninth lens with negative refractive power; and the fourth lens group comprises a tenth lens with positive refractive power and an eleventh lens with negative refractive power. The high-resolution full-frame lens with ultra-wide angle, low distortion and low breathing effect has a broad market prospect.

Description

Technical Field

[0001] The present invention relates to the field of optical device technology, and in particular to a full-frame lens. Background Technology

[0002] Full-frame 35mm lenses, with their perspective close to that of the human eye, are often called "human eyes" and are commonly used in street photography. They offer flexible composition and strong narrative capabilities, making high resolution at the edge of the field of view essential. They excel in both portrait and landscape photography. During video shooting, visual continuity and distortion are also crucial as the focus shifts.

[0003] Therefore, there is an urgent need to design a high-resolution full-frame lens with wide-angle, low distortion, and low breathing effect to meet the application needs of the broad market prospects. Summary of the Invention

[0004] In view of this, the present invention provides a full-frame lens, a high-resolution full-frame lens with ultra-wide angle, low distortion, and low breathing effect, which has broad market prospects.

[0005] This application provides a full-frame lens, comprising a first lens group with positive optical power, an aperture stop, a second lens group with positive optical power, a third lens group with negative optical power, and a fourth lens group with negative optical power, arranged sequentially along the optical axis from the object side to the image side; the first lens group, the second lens group, and the fourth lens group are fixed groups; when the focus shifts at different object distances, the third lens group moves along the optical axis to focus;

[0006] The first lens group consists of a first lens with positive optical power, a second lens with negative optical power, a third lens with negative optical power, a fourth lens with positive optical power, and a fifth lens with positive optical power, arranged sequentially from the object side to the image side.

[0007] The second lens group consists of a sixth lens with negative optical power, a seventh lens with positive optical power, and an eighth lens with positive optical power arranged sequentially from the object side to the image side.

[0008] The third lens group has a ninth lens with negative optical power arranged sequentially from the object side to the image side;

[0009] The fourth lens group consists of a tenth lens with positive optical power and an eleventh lens with negative optical power, arranged sequentially from the object side to the image side.

[0010] As a preferred embodiment, the first lens is a convex-concave spherical lens, the second lens is a convex-concave spherical lens, the third lens is a concave-concave spherical lens, the fourth lens is a convex-convex spherical lens, and the fifth lens is a convex-convex or convex-concave spherical lens.

[0011] The sixth lens is a concave-concave spherical lens, the seventh lens is a convex-convex or convex-concave spherical lens, and the eighth lens is a convex-convex aspherical lens;

[0012] The ninth lens is a convex-concave aspherical lens;

[0013] The tenth lens is a convex-convex spherical lens, and the eleventh lens is a concave-concave spherical lens.

[0014] As a preferred embodiment, all of the first to the eleventh lenses are glass lenses.

[0015] As a preferred embodiment, the ratio of the third lens group to the focal length of the full-frame lens at different object distances satisfies the following requirements:

[0016] 0.0288≤(f (G3) / f inf )-(f (G3) / f 1500 )≤0.0423;

[0017] 0.1480≤(f (G3) / f inf )-(f (G3) / f 290 )≤0.2164;

[0018] Among them, f (G3) f represents the focal length of the third lens group. inf f represents the focal length of the full-frame lens at infinity. 1500 This indicates the focal length of the full-frame lens at a 1500mm object distance, f. 290 This indicates the focal length of the full-frame lens at an object distance of 290mm.

[0019] As a preferred embodiment, the refractive indices of the eighth lens and the ninth lens meet the following requirements:

[0020] 3.5016≤Nd (8) +Nd (9) ≤3.6853;

[0021] Among them, Nd (8) Nd represents the refractive index of the eighth lens L8. (9) This represents the refractive index of the ninth lens.

[0022] As a preferred embodiment, the positional relationship between the eighth to eleventh lenses and the aperture stop satisfies the following requirements:

[0023] 0.6086≤T (S10-14) / T (S10-20)≤0.6347;

[0024] Among them, T (S10-14) T represents the thickness from the aperture stop to the image aspect of the eighth lens. (S10-20) This indicates the thickness of the image from the aperture stop to the eleventh lens.

[0025] As a preferred embodiment, the first lens and the second lens form a first cemented lens group with negative optical power;

[0026] The third lens and the fourth lens form a second cemented lens group with negative optical power;

[0027] The sixth lens and the seventh lens together form a third cemented lens group with negative optical power.

[0028] As a preferred embodiment, the focal lengths of the first cemented lens group and the first lens group meet the following requirements:

[0029] -1.9575≤f (L1-2) / f (G1) ≤-0.9528;

[0030] Among them, f (L1-2) f represents the focal length of the first cemented lens group. (G1) This indicates the focal length of the first lens group.

[0031] As a preferred embodiment, the Abbe numbers of the second lens and the fourth lens satisfy the following requirements:

[0032] 90.3934≤Vd (L2) + Vd (L4) ≤137.2488;

[0033] Among them, Vd (L2) Vd represents the Abbe number of the second lens. (L4) This indicates the Abbe number of the fourth lens.

[0034] As a preferred embodiment, the optical power of the fourth lens group and the full-frame lens at infinity satisfies the following relationship:

[0035] -0.2839≤Φ (G4) \Φ (inf) ≤-0.0437;

[0036] Where, Φ (G4) Φ represents the optical power of the fourth lens group. (inf) This indicates the optical focal length of the full-frame lens at infinity.

[0037] In summary, the full-frame lens provided in this application includes a first lens group with positive optical power, an aperture stop, a second lens group with positive optical power, a third lens group with negative optical power, and a fourth lens group with negative optical power, arranged sequentially along the optical axis from the object side to the image side; the first lens group, the second lens group, and the fourth lens group are fixed groups; when the focus shifts at different object distances, the third lens group moves along the optical axis to focus; the first lens group includes a first lens with positive optical power, a second lens with negative optical power, a third lens with negative optical power, a fourth lens with positive optical power, and a fifth lens with positive optical power; the second lens group includes a sixth lens with negative optical power, a seventh lens with positive optical power, and an eighth lens with positive optical power; the third lens group includes a ninth lens with negative optical power; and the fourth lens group includes a tenth lens with positive optical power and an eleventh lens with negative optical power. This application employs an optical structure consisting of 9 spherical glass lenses and 2 aspherical glass lenses, achieving optical distortion of <0.9% at infinity and <1.2% at a minimum object distance of 290mm at 546nm. Simultaneously, the third lens group uses aspherical lenses for focusing, achieving a smooth change in the angle of view with low breathing effect and high resolution when switching between object distances of 0.29m and infinity. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure of a full-frame lens at infinity object distance provided in Embodiment 1 of this application;

[0039] Figure 2 for Figure 1 The provided distortion curve for a full-frame lens at infinity.

[0040] Figure 3 for Figure 1 The provided distortion curve for a full-frame lens at a 290mm object distance;

[0041] Figure 4 for Figure 1 The provided MTF curve for a full-frame lens at infinity.

[0042] Figure 5 This is a schematic diagram of the structure of a full-frame lens at infinity object distance provided in Embodiment 2 of this application;

[0043] Figure 6 for Figure 5 The distortion curve of the full-frame lens at infinity is provided.

[0044] Figure 7 for Figure 5 The distortion curve of the provided full-frame lens at a 290mm object distance;

[0045] Figure 8 for Figure 5MTF curve of a full-frame lens at infinity.

[0046] Figure 9 This is a schematic diagram of the structure of a full-frame lens at infinity object distance provided in Embodiment 3 of this application;

[0047] Figure 10 for Figure 9 Here is a distortion curve for a full-frame lens at infinity:

[0048] Figure 11 for Figure 9 The distortion curve of the provided full-frame lens at a 290mm object distance;

[0049] Figure 12 for Figure 9 The MTF curve of the provided full-frame lens at infinity. Detailed Implementation

[0050] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present application are shown in the drawings, not the entire structure.

[0051] Figure 1 This is a schematic diagram of the structure of a full-frame lens at infinity object distance provided in Embodiment 1 of this application, as shown below. Figure 1 As shown, the full-frame lens 100 provided in this application embodiment includes a first lens group G1 with positive optical power, an aperture stop STO, a second lens group G2 with positive optical power, a third lens group G3 with negative optical power, and a fourth lens group G4 with negative optical power, arranged sequentially along the optical axis from the object side to the image side. The first lens group G1, the second lens group G2, and the fourth lens group G4 are a fixed group. When the focus shifts at different object distances, the third lens group G3 moves along the optical axis to focus.

[0052] Optical power is equal to the difference between the image-side convergence and the image-side convergence, and it characterizes the ability of a lens system to deflect light. The larger the absolute value of optical power, the stronger the deflection ability; the smaller the absolute value, the weaker the deflection ability. When optical power is positive, the refraction of light is converging; when optical power is negative, the refraction of light is diverging. Optical power can be used to characterize a single refractive surface of a lens (i.e., one surface of the lens), a single lens, or a system of multiple lenses (i.e., a lens group).

[0053] Specifically, the first lens group G1 consists of five lenses with optical power, arranged sequentially from the object side to the image side: a first lens L1 with positive optical power, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, and a fifth lens L5 with positive optical power. These five lenses, forming the first lens group G1 with positive optical power, can converge light rays from a wide field of view into the system, thus improving the field of view of the optical system.

[0054] The second lens group G2 consists of three lenses with optical power. Arranged sequentially from the object side to the image side are a sixth lens L6 with negative optical power, a seventh lens L7 with positive optical power, and an eighth lens L8 with positive optical power. These three lenses form the second lens group G2 with positive optical power. Furthermore, they converge the light rays collected by the first lens group G1 into the third lens group G3, reducing the window size of light rays within the system and facilitating a smooth transition of light to the optically focusing third lens group G3, thus reducing light loss.

[0055] The third lens group G3 consists of a single lens with optical power, and a ninth lens L9 with negative optical power is arranged sequentially from the object side to the image side. When the focal point shifts at different object distances, the third lens group G3 moves slightly along the optical axis to focus, achieving a clear image.

[0056] The fourth lens group G4 consists of three lenses with optical power: a tenth lens L10 with positive optical power and an eleventh lens L11 with negative optical power, arranged sequentially from the object side to the image side. These three lenses, forming the fourth lens group G4 with negative optical power, diverge the light rays entering the image plane, thereby improving image sharpness.

[0057] For example, refer to Figure 1 As shown, along the optical axis from the object side to the image side, this application consists of 11 lenses with optical power. The first lens L1 is a convex-concave spherical lens. The second lens L2 is a convex-concave spherical lens. The third lens L3 is a concave-concave spherical lens. The fourth lens L4 is a convex-convex spherical lens. The fifth lens L5 is a convex-convex or convex-concave spherical lens. The sixth lens L6 is a concave-concave spherical lens. The seventh lens L7 is a convex-convex or convex-concave spherical lens. The eighth lens L8 is a convex-convex aspherical lens. The ninth lens L9 is a convex-concave aspherical lens. The tenth lens L10 is a convex-convex spherical lens. The eleventh lens L11 is a concave-concave spherical lens. All lenses from the first lens L1 to the eleventh lens L11 are made of glass.

[0058] Specifically, the first lens L1 is designed as a meniscus glass spherical lens with positive optical power and a convex surface facing the object side. This can effectively control the smooth entry of light into the rear of the optical system, reduce spherical aberration of the optical system, and improve the imaging quality of the optical system.

[0059] Both the second lens L2 and the third lens L3 are designed as concave-concave glass spherical lenses with negative optical power. They diverge the light entering the system, effectively control the direction of light, reduce field curvature and spherical aberration of the optical system, and improve the image quality of the optical system.

[0060] Optionally, the first lens L1 and the second lens L2 form a first cemented lens group L with negative optical power. 1-2 Cemented lens groups can reduce chromatic aberration in the optical system, decrease lens sensitivity, and improve resolution and assembly yield.

[0061] Optionally, the first cemented lens group L 1-2 The focal length of the first lens group G1 meets the following requirements:

[0062] -1.9575≤f (L1-2) / f (G1) ≤-0.9528.

[0063] Among them, f (L1-2) Indicates the first cemented lens group L 1-2 focal length, f (G1) This indicates the focal length of the first lens group G1.

[0064] The fourth lens L4 is designed as a positive power convex-convex glass spherical lens, which can effectively control the smooth entry of light into the fifth lens L5. The fifth lens L5 is designed as a positive power convex-convex or convex-concave glass spherical lens.

[0065] Optionally, the third lens L3 and the fourth lens L4 form a second cemented lens group L with negative optical power. 3-4 This reduces chromatic aberration in the optical system, lowers lens sensitivity, and improves resolution and assembly yield.

[0066] The sixth lens, L6, is designed as a concave-concave glass spherical lens with negative optical power, while the seventh lens, L7, is designed as a convex-convex or convex-concave glass spherical lens with positive optical power. By diverging the light rays with the sixth lens L6 and converging the light rays with the seventh lens L7, the direction of the light rays is controlled, reducing the field curvature and spherical aberration of the optical system.

[0067] Optionally, the sixth lens L6 and the seventh lens L7 form a third cemented lens group L with negative optical power. 6-7 .

[0068] By cementing the sixth lens L6 and the seventh lens L7 together, the chromatic aberration of the optical system is reduced, the lens sensitivity is decreased, and the resolution and assembly yield are improved.

[0069] Furthermore, the eighth lens L8 is designed as a positive power convex-convex aspherical glass lens, compared to the third cemented lens group L...6-7 The diverging light rays converge to ensure a smooth transition to the ninth lens L9.

[0070] The ninth lens L9, used for focusing, is designed as a convex-concave aspherical glass lens with negative optical power. When the focus shifts at different object distances, focusing is achieved by slightly moving the ninth lens L9 along the optical axis, resulting in a clear image.

[0071] The tenth lens, L10, is designed as a positive optical power convex-convex glass spherical lens, and the eleventh lens, L11, is designed as a negative optical power concave-concave glass spherical lens. These lenses further converge and diverge light rays before they are incident on the designated image plane to form an image.

[0072] Based on the above embodiments, the Abbe numbers of the second lens L2 and the fourth lens L4 meet the following requirements:

[0073] 90.3934≤Vd (L2) + Vd (L4) ≤137.2488;

[0074] Among them, Vd (L2) Vd represents the Abbe number of the second lens L2. (L4) This represents the Abbe number of the fourth lens L4.

[0075] Abbe number is an index used to represent the dispersion ability of a transparent medium. The more severe the dispersion of the medium, the smaller the Abbe number; conversely, the less severe the dispersion of the medium, the larger the Abbe number.

[0076] This invention combines a first lens L1 and a second lens L2 into a cemented lens group, and a third lens L3 and a fourth lens L4 into a cemented lens group. By rationally selecting the Abbe number of the second lens L2 and the fourth lens L4, the dispersion of the lens can be reduced, the chromatic aberration of the optical system can be reduced, the lens sensitivity can be reduced, and the resolution and assembly yield can be improved.

[0077] To address the need for a smooth angle-of-view and low breathing effect during the focusing process of a full-frame lens, this application embodiment sets the ratio of the third lens group G3 to the focal length of the full-frame lens at different object distances to meet the following requirements:

[0078] 0.0288≤(f (G3) / f inf )-(f (G3) / f 1500 )≤0.0423.

[0079] 0.1480≤(f (G3) / f inf )-(f (G3) / f 290 )≤0.2164.

[0080] Among them, f(G3) f represents the focal length of the third lens group G3. inf f represents the focal length of a full-frame lens at infinity. 1500 This indicates the focal length of a full-frame lens at a 1500mm object distance, f. 290 This indicates the focal length of a full-frame lens at an object distance of 290mm.

[0081] Lens breathing, or lens breathing, refers to the slight change in the image angle (equivalent focal length) when the object distance changes. This results in a slight scaling of the image, disrupting the continuity of the shot and negatively impacting the video shooting experience. The smaller the change in focal length at different object distances, the weaker the lens breathing effect.

[0082] This application embodiment satisfies the above conditions by limiting the ratio of the third lens group G3 to the focal length of the full-frame lens at different object distances, so that the focal length of the full-frame lens changes very little at different object distances, the breathing effect is weak, the angle of view changes smoothly, and the image quality is higher.

[0083] Based on the above embodiments, the refractive indices of the eighth lens L8 and the ninth lens L9 meet the following requirements:

[0084] 3.5016≤Nd (8) +Nd (9) ≤3.6853;

[0085] Among them, Nd (8) Nd represents the refractive index of the eighth lens L8. (9) This indicates the refractive index of the ninth lens, L9.

[0086] Among them, the refractive index material has a stronger ability to deflect light, with a larger value indicating a stronger deflection ability. This application specifies that the refractive indices of the eighth lens L8 and the ninth lens L9 satisfy the above relationship, which is beneficial to ensure that the light rays are smoothly converged by the positive optical power of the eighth lens L8 and then smoothly enter the negative optical power of the ninth lens L9.

[0087] Based on the above embodiments, the positional relationship between the eighth lens L8 to the eleventh lens L11 and the aperture STO satisfies the following requirements:

[0088] 0.6086≤T (S10-14) / T (S10-20) ≤0.6347;

[0089] Among them, T (S10-14) T represents the image thickness from aperture STO to the eighth lens L8. (S10-20) This indicates the image thickness from the aperture stop STO to the eleventh lens L11.

[0090] Among them, the aperture stop STO includes the aperture stop and the field stop. The aperture stop refers to the stop that restricts the beam the most, and the field stop refers to the stop that restricts the field of view (size) the most.

[0091] The position of the aperture stop is sensitive to small distortion structures. Changing the position of the aperture stop directly changes the incident angle and height of the principal ray in the optical system, thus affecting lens distortion.

[0092] This application sets the aperture stop STO between the fifth lens L5 and the sixth lens L6. Furthermore, the eighth lens L8 and the ninth lens L9 both use aspherical lenses to better control distortion, resulting in small distortion from infinity to near object distance, thereby improving the image quality of the lens.

[0093] Based on the above embodiments, the optical power of the fourth lens group G4 and the full-frame lens at infinity satisfies the following relationship:

[0094] -0.2839≤Φ (G4) \Φ (inf) ≤-0.0437;

[0095] Where, Φ (G4) Φ represents the optical power of the fourth lens group G4. (inf) This indicates the focal length of a full-frame lens at infinity.

[0096] Specifically, the fourth lens group G4 uses a combination of positive and negative lenses, which has negative optical power to allow more light to enter the image plane, correct field curvature, and improve resolution at the edge of the image.

[0097] In summary, the all-glass full-frame lens provided by this invention utilizes a reasonable combination and surface design of nine spherical glass lenses and two aspherical glass lenses, effectively saving space and expanding the lens's application scenarios. It achieves optical distortion of <0.9% at infinity and <1.2% at a minimum object distance of 290mm (546nm). When the third lens group uses aspherical lenses for focusing, it achieves a smooth angle-of-view change with low breathing effect and high resolution when switching between object distances of 0.29m and infinity.

[0098] Optional, refer to Figure 1 As shown, the full-frame lens 100 may also include a flat glass CG, disposed in the optical path between the eleventh lens L11 and the image plane Image. The flat glass CG can protect the photosensitive chip in the imaging sensor. The imaging chip is used to convert the light signals collected by the lens system into electrical signals, thereby ensuring the imaging effect of the lens system.

[0099] The following are some specific embodiments to illustrate the optical performance parameters of the lens system provided in this application.

[0100] As one possible implementation method, please refer to [reference]. Figure 1 Embodiment 1 provides a full-frame lens 100. Table 1 shows the optical physical parameters of the first lens L1 to the eleventh lens L11 in the full-frame lens 100 provided in Embodiment 1 of this application. The units for the radius of curvature R and thickness d are millimeters (mm). Table 2 shows the aspherical coefficient values ​​of the aspherical lenses in the full-frame lens 100 provided in Embodiment 1 of this application.

[0101] Table 1 Design values ​​of optical physical parameters of the lens system

[0102] Face number face shape Radius of curvature (mm) Thickness (mm) Refractive index (Nd) Abbe number (Vd) Half diameter S1 spherical 32.3360 3.6264 1.98613 16.48390 15.4795 S2 spherical 35.0000 1.0005 1.59282 68.62440 13.9600 S3 spherical 16.9745 10.0227 12.0225 S4 spherical -30.4567 6.5248 1.92539 27.36960 10.5900 S5 spherical 79.0039 0.0000 12.1952 S6 spherical 78.9841 8.3712 1.59282 68.62440 12.1954 S7 spherical -29.0577 0.1984 13.5947 S8 spherical 35.6584 4.2882 2.02550 21.74200 15.4760 S9 spherical -800.0000 4.9841 15.3953 STO spherical Infinite 6.5793 13.8000 S11 spherical -59.5523 1.1253 1.81202 23.82480 12.3342 S12 spherical 15.7544 5.9661 1.64508 59.24600 11.9393 S13 spherical 201.2344 2.9958 11.9895 S14 aspherical 40.3317 8.2352 1.73527 47.63220 12.5894 S15 aspherical -26.6167 D15 12.5900 S16 aspherical 492.4750 1.0544 1.95001 29.37260 12.6413 S17 aspherical 78.5014 D17 12.3000 S18 spherical 2249.4182 3.6899 1.98613 16.48390 13.7297 S19 spherical -35.3077 0.0788 13.8218 S20 spherical -50.5770 1.0110 1.79517 27.45380 13.5734 S21 spherical 37.4483 21.1882 13.5961 S22 spherical Infinite 2.0000 1.5168 64.1987 20.7518 S23 spherical Infinite 1.0000 21.2428 S24 spherical Infinite - 21.6300

[0103] In Table 1, the surface numbers are assigned according to the surface sequence of each lens. For example, surfaces S1 and S2 are the object-side and image-side surfaces of the first lens L1, respectively; surfaces S3 and S4 are the object-side and image-side surfaces of the second lens L2, respectively, and so on. "STO" represents the aperture stop of the lens. The radius of curvature represents the degree of curvature of the corresponding lens surface. A positive value indicates that the surface bends towards the image side, and a negative value indicates that the surface bends towards the object side. "INF" indicates that the surface is flat and the radius of curvature is infinite. "IMA" represents the image side. The thickness represents the central axial distance between the current surface and the next surface. The refractive index nd represents the ability of the material between the current surface and the next surface to deflect light. A blank space indicates that the current position is air and the refractive index is 1. The Abbe number vd is an index used to represent the dispersion ability of a transparent medium. The more severe the dispersion of the medium, the smaller the Abbe number; conversely, the less severe the dispersion of the medium, the larger the Abbe number.

[0104] In this first embodiment, the eighth lens L8 and the ninth lens L9 are aspherical lenses, with both their object-side and image-side surfaces being aspherical. Their aspherical surface shape equation Z satisfies:

[0105] In Embodiment 1 of this application, the aspherical lens of the full-frame lens 100 satisfies the following formula:

[0106] ;

[0107] Where z is the axial distance from the vertex of the surface at a position perpendicular to the optical axis and at a height of r along the optical axis; r is the height of the aspherical surface; c is the curvature of the fitted sphere, which is numerically the reciprocal of the radius of curvature; and k is the fitted conic coefficient. These are the higher-order aspheric coefficients of the 4th, 6th, 8th, 10th, 12th, and 14th orders corresponding to aspheric surfaces; These are combined to form higher-order terms corresponding to the aspherical surface. The units for Z, r, and c are all mm.

[0108] Table 2 Aspherical coefficients of the lens system

[0109] Face number S14 0.60062 -6.85897974936E-06 -2.61076388383E-08 8.04355377067E-11 S15 0.31009 1.94973919880E-05 -2.47711094456E-09 -3.71807723581E-10 S16 47.12930 3.61590562735E-05 1.39154896742E-07 -1.50487947063E-09 S17 14.93043 3.86324376472E-05 1.19272889737E-07 -6.35998892177E-10

[0110] Face number S14 -2.29786719426E-12 1.77277817617E-14 -5.37101465973E-17 S15 1.43939017212E-12 8.48840527541E-16 -2.06845289261E-17 S16 4.42899481507E-12 -2.97519447903E-15 -9.99374007321E-18 S17 -3.65405273278E-12 2.99752027002E-14 -6.45381522706E-17

[0111] In Table 2, -6.85897974936E-06 represents the coefficient for surface number S14. -6.85897974936*10 -6 And so on.

[0112] In Example 1, when the working object distance is infinity and 290mm, the position of the focus movement group (values ​​of D15 and D17), the half field of view, and the breathing rate data are shown in Table 3:

[0113] Table 3. System breathing rate of a full-frame lens at different object distances.

[0114] Object distance / mm D15 D17 Maximum image height half field of view respiratory rate Infinite 0.9910 7.5075 32.2348 - 1500 1.7285 6.7700 32.2078 0.08% 290 4.8419 3.6565 32.1161 0.37%

[0115] The formula for calculating the breathing rate when focusing at different object distances is:

[0116]

[0117] In fact, w represents the maximum image height half-field angle when the distance is not infinite. The maximum image height half-field angle at infinity.

[0118] As shown in Table 3, at different object distances, the absolute value of the breathing rate of the full-frame lens provided in Example 1 is less than 0.40%, which belongs to a low breathing effect optical system.

[0119] Furthermore, several performance tests were conducted on the full-frame lens 100 provided in Example 1, and the specific test results are as follows:

[0120] Figure 2 for Figure 1 The provided distortion curve for a full-frame lens at infinity object distance. Figure 3 for Figure 1 The provided distortion curve for a full-frame lens at a 290mm object distance shows the following coordinate system: the horizontal axis represents the magnitude of distortion (%), and the vertical axis represents the normalized image height (unitless). Figure 2 and Figure 3 As can be seen, the distortion of the lens provided in this embodiment is well corrected from infinity to 290mm, which can better ensure the realism of the object image, and the imaging distortion is <1%.

[0121] Figure 4 for Figure 1The provided MTF curve for a full-frame lens at infinity is shown. The horizontal axis represents spatial frequency, indicating the number of black and white line pairs per 1mm. The vertical axis represents the modulation modulus (M' / M), where M refers to the pre-image grating modulation degree, and M' refers to the post-image grating modulation degree; therefore, 0 ≤ M' / M ≤ 1. The MTF curve represents the resolving power of the optical system at different frequencies in different fields of view, meridional, and sagittal directions. It reflects the degree of image quality after the object passes through the optical system; the higher the MTF, the higher the image quality of the lens. Figure 4 It can be seen that the MTF of this optical system at infinity object distance is greater than 0.5 in all meridional and sagittal directions of the field of view in all fields of view at a spatial frequency of 30 lp / mm, which provides a high imaging effect for the camera lens.

[0122] Example 2

[0123] Figure 5 This is a schematic diagram of a lens system provided in Embodiment 2 of this application. Figure 5 As shown, the full-frame lens 100 provided in Embodiment 2 of this application includes a first lens group G1 with positive optical power, an aperture stop, a second lens group G2 with positive optical power, a third lens group G3 with negative optical power, and a fourth lens group G4 with negative optical power, arranged sequentially along the optical axis from the object side to the image side. The first lens group G1, the second lens group G2, and the fourth lens group G4 are fixed groups; when the focus shifts at different object distances, the third lens group G3 moves along the optical axis to focus.

[0124] The first lens L1 is designed as a meniscus glass spherical lens with positive optical power and a convex surface facing the object side. The second lens L2 and the third lens L3 are both designed as concave-concave glass spherical lenses with negative optical power. The first lens L1 and the second lens L2 form a first cemented lens group L with negative optical power. 1-2 The fourth lens, L4, is designed as a positive power convex-convex spherical glass lens, and the fifth lens, L5, is designed as a positive power convex-convex or convex-concave spherical glass lens. The third lens, L3, and the fourth lens, L4, form the second cemented lens group L3-4 with negative optical power. The sixth lens, L6, is designed as a negative power concave-concave spherical glass lens, and the seventh lens, L7, is designed as a positive power convex-convex or convex-concave spherical glass lens. The sixth lens, L6, and the seventh lens, L7, form the third cemented lens group L3-4 with negative optical power. 6-7 The eighth lens, L8, is designed as a positive power convex-convex aspherical glass lens, and the ninth lens, L9, is designed as a negative power convex-concave aspherical glass lens. The tenth lens, L10, is designed as a positive power convex-convex spherical glass lens, and the eleventh lens, L11, is designed as a negative power concave-concave spherical glass lens.

[0125] The flat glass CG is positioned in the optical path between the eleventh lens L11 and the image plane. The flat glass CG protects the photosensitive chip in the imaging sensor. The imaging chip is used to convert the light signals collected by the lens system into electrical signals, thereby ensuring the imaging effect of the lens system.

[0126] As one possible implementation method, please refer to [the relevant documentation / reference]. Figure 5 Embodiment 2 provides a full-frame lens 100. Table 4 shows the optical physical parameters of the first lens L1 to the eleventh lens L11 in the full-frame lens 100 provided in Embodiment 2 of this application. The units for the radius of curvature R and thickness d are millimeters (mm). Table 5 shows the aspherical coefficient values ​​of the aspherical lenses in the full-frame lens 100 provided in Embodiment 2 of this application.

[0127] Table 4 Design values ​​of optical physical parameters of the lens system

[0128] Face number face shape Radius of curvature (mm) Thickness (mm) Refractive index (Nd) Abbe number (Vd) Half diameter S1 spherical 67.6654 1.9548 2.03331 22.81901 15.9902 S2 spherical 150.0000 0.9994 1.80451 39.63950 15.6374 S3 spherical 24.2178 7.9673 13.6379 S4 spherical -28.5201 4.3301 1.78215 23.41010 13.5355 S5 spherical 78.3038 0.5196 14.3120 S6 spherical 80.5405 6.0614 1.71661 50.75394 14.4720 S7 spherical -32.3835 0.1052 14.8630 S8 spherical 36.0405 3.8987 2.00707 18.94666 15.6697 S9 spherical 300.0000 12.1162 15.5310 STO spherical Infinite 7.8167 12.5000 S11 spherical -27.0544 1.0475 1.85335 22.56150 11.3864 S12 spherical 20.3953 5.4841 1.69680 55.45970 12.1767 S13 spherical -76.6434 0.1224 12.2600 S14 aspherical 41.5125 8.3997 1.80882 40.97030 12.8702 S15 aspherical -26.8035 D15 12.9400 S16 aspherical 823.8745 0.9999 1.69281 53.04920 13.1367 S17 aspherical 47.6926 D17 12.8985 S18 spherical 91.8660 4.6688 1.98613 16.48390 14.3568 S19 spherical -40.2915 0.1000 14.4058 S20 spherical -52.5705 1.4462 1.92273 20.94723 14.1357 S21 spherical 46.8347 23.7247 14.0719 S22 spherical Infinite 2.0000 1.5168 64.1987 20.9185 S23 spherical Infinite 1.0000 21.3302 S24 spherical Infinite - 21.6509

[0129] In Table 4, the surface numbers are assigned according to the surface sequence of each lens. For example, surfaces S1 and S2 are the object-side and image-side surfaces of the first lens L1, respectively; surfaces S3 and S4 are the object-side and image-side surfaces of the second lens L2, respectively, and so on. "STO" represents the aperture stop of the lens. The radius of curvature represents the degree of curvature of the corresponding lens surface. A positive value indicates that the surface bends towards the image side, and a negative value indicates that the surface bends towards the object side. "INF" indicates that the surface is flat and the radius of curvature is infinite. "IMA" represents the image side. The thickness represents the central axial distance between the current surface and the next surface. The refractive index nd represents the ability of the material between the current surface and the next surface to deflect light. A blank space indicates that the current position is air and the refractive index is 1. The Abbe number vd is an index used to represent the dispersion ability of a transparent medium. The more severe the dispersion of the medium, the smaller the Abbe number; conversely, the less severe the dispersion of the medium, the larger the Abbe number.

[0130] In this second embodiment, the eighth lens L8 and the ninth lens L9 are aspherical lenses, with both their object-side and image-side surfaces being aspherical. Their aspherical surface shape equation Z satisfies:

[0131] In Embodiment 2 of this application, the aspherical lens of the full-frame lens 100 satisfies the following formula:

[0132] ;

[0133] Where z is the axial distance from the vertex of the surface at a position perpendicular to the optical axis and at a height of r along the optical axis; r is the height of the aspherical surface; c is the curvature of the fitted sphere, which is numerically the reciprocal of the radius of curvature; and k is the fitted conic coefficient. These are the higher-order aspheric coefficients of the 4th, 6th, 8th, 10th, 12th, and 14th orders corresponding to aspheric surfaces; These are combined to form higher-order terms corresponding to the aspherical surface. The units for Z, r, and c are all mm.

[0134] Table 5 Aspherical coefficients of the lens system

[0135] Face number S14 0.78865 -5.65595000281E-06 -2.99023316868E-08 3.06525174718E-11 S15 -0.12664 1.42895804602E-05 1.19350069588E-08 -3.61593253983E-10 S16 50.00000 2.47726993151E-05 1.80158626692E-07 -1.66233916238E-09 S17 4.99815 2.79043837621E-05 1.37637338506E-07 -7.94133822055E-10

[0136] Face number S14 -6.61802781991E-13 5.87362939962E-15 -2.74834998129E-17 S15 9.31499625012E-13 1.94526902469E-15 -1.91274580336E-17 S16 3.10811403065E-12 6.03653490892E-15 -1.27173534931E-17 S17 -3.65137383940E-12 3.02587933445E-14 -4.69782349208E-17

[0137] In Table 5, -5.65595000281E-06 represents the coefficient for surface number S14. -5.65595000281*10 -6 And so on.

[0138] In Example 2, when the working object distance is infinity and 290mm, the position of the focus movement group (values ​​of D15 and D17), the half field of view, and the breathing rate data are shown in Table 6:

[0139] Table 6. System breathing rate of a full-frame lens at different object distances

[0140] Object distance / mm D15 D17 Maximum image height half field of view respiratory rate Infinite 1.0087 6.4827 31.5427 - 1500 1.6347 5.8567 31.4860 0.18% 290 4.2361 3.2553 31.2632 0.89%

[0141] The formula for calculating the breathing rate when focusing at different object distances is:

[0142]

[0143] In fact, w represents the maximum image height half-field angle when the distance is not infinite. The maximum image height half-field angle at infinity.

[0144] As shown in Table 6, at different object distances, the absolute value of the breathing rate of the full-frame lens provided in Example 2 is less than 0.90%, which belongs to a low breathing effect optical system.

[0145] Furthermore, several performance tests were conducted on the full-frame lens 100 provided in Example 2, and the specific test results are as follows:

[0146] Figure 6 for Figure 5 The provided distortion curve for a full-frame lens at infinity is shown. Figure 7 for Figure 5 This is a distortion curve for a full-frame lens at a 290mm object distance. In the coordinate system of the graph, the horizontal axis represents the magnitude of distortion (%), and the vertical axis represents the normalized image height (unitless). Figure 6 and Figure 7As can be seen, the distortion of the lens provided in this embodiment 2 is well corrected from infinity to 290mm, which better ensures the realism of the object image, and the imaging distortion is all <1.2%.

[0147] Figure 8 for Figure 5 The provided MTF curve for a full-frame lens at infinity is shown. The horizontal axis represents spatial frequency, indicating the number of black and white line pairs per millimeter (m). The vertical axis represents the modulation index (M' / M), where M refers to the pre-image grating modulation degree, and M' refers to the post-image grating modulation degree; therefore, 0 ≤ M' / M ≤ 1. The MTF curve represents the resolving power of the optical system at different frequencies in different fields of view, meridional, and sagittal directions. It reflects the degree of image quality after the object passes through the optical system; the higher the MTF, the higher the image quality of the lens. Figure 8 It can be seen that the MTF of this optical system at infinity object distance is greater than 0.5 in all meridional and sagittal directions of the field of view in all fields of view at a spatial frequency of 30 lp / mm, which provides a high imaging effect for the camera lens.

[0148] Example 3

[0149] Figure 9 This is a schematic diagram of a lens system provided in Embodiment 3 of this application. Figure 9 As shown, the full-frame lens 100 provided in Embodiment 2 of this application includes a first lens group G1 with positive optical power, an aperture stop STO, a second lens group G2 with positive optical power, a third lens group G3 with negative optical power, and a fourth lens group G4 with negative optical power, arranged sequentially along the optical axis from the object side to the image side. The first lens group G1, the second lens group G2, and the fourth lens group G4 are fixed groups; when the focus shifts at different object distances, the third lens group G3 moves along the optical axis to focus.

[0150] The first lens L1 is designed as a meniscus glass spherical lens with positive optical power and a convex surface facing the object side. The second lens L2 and the third lens L3 are both designed as concave-concave glass spherical lenses with negative optical power. The first lens L1 and the second lens L2 form a first cemented lens group L with negative optical power. 1-2 The fourth lens, L4, is designed as a positive power convex-convex spherical glass lens, and the fifth lens, L5, is designed as a positive power convex-convex or convex-concave spherical glass lens. The third lens, L3, and the fourth lens, L4, form the second cemented lens group L3-4 with negative optical power. The sixth lens, L6, is designed as a negative power concave-concave spherical glass lens, and the seventh lens, L7, is designed as a positive power convex-convex or convex-concave spherical glass lens. The sixth lens, L6, and the seventh lens, L7, form the third cemented lens group L3-4 with negative optical power. 6-7The eighth lens, L8, is designed as a positive power convex-convex aspherical glass lens, and the ninth lens, L9, is designed as a negative power convex-concave aspherical glass lens. The tenth lens, L10, is designed as a positive power convex-convex spherical glass lens, and the eleventh lens, L11, is designed as a negative power concave-concave spherical glass lens.

[0151] The flat glass CG is positioned in the optical path between the eleventh lens L11 and the image plane. The flat glass CG protects the photosensitive chip in the imaging sensor. The imaging chip is used to convert the light signals collected by the lens system into electrical signals, thereby ensuring the imaging effect of the lens system.

[0152] As one possible implementation method, please refer to [reference]. Figure 9 Embodiment 3 provides a full-frame lens 100. Table 7 shows the optical physical parameters of the first lens L1 to the eleventh lens L11 in the full-frame lens 100 provided in Embodiment 3 of this application. The units for the radius of curvature R and thickness d are millimeters (mm). Table 8 shows the aspherical coefficient values ​​of the aspherical lenses in the full-frame lens 100 provided in Embodiment 3 of this application.

[0153] Table 7 Design values ​​of optical physical parameters of the lens system

[0154] Face number face shape Radius of curvature (mm) Thickness (mm) Refractive index (Nd) Abbe number (Vd) Half diameter S1 spherical 41.0222 2.4270 1.98613 16.48390 15.5115 S2 spherical 73.7035 1.0000 1.66264 57.83590 15.0358 S3 spherical 18.2564 10.1756 12.4635 S4 spherical -28.2370 4.7315 1.97505 25.31030 11.3000 S5 spherical 159.6205 0.0000 13.0411 S6 spherical 159.6205 7.3809 1.59628 64.06850 13.0411 S7 spherical -26.7047 0.1000 13.9565 S8 spherical 35.2698 4.8549 2.04050 24.57700 15.7843 S9 spherical -800.0000 4.8357 15.6545 STO spherical Infinite 7.7263 14.0900 S11 spherical -45.3297 1.0000 1.83396 25.08230 12.4034 S12 spherical 16.6794 6.5325 1.65143 58.71920 12.2891 S13 spherical -414.5997 2.5565 12.3910 S14 aspherical 40.8871 7.6248 1.69680 55.45970 13.1315 S15 aspherical -27.6176 1.0050 13.2000 S16 aspherical 321.1188 1.2770 1.80610 40.72560 13.5232 S17 aspherical 62.1742 7.5702 13.2580 S18 spherical 159.2370 4.4423 1.98613 16.48390 14.7810 S19 spherical -40.1855 0.1000 14.8513 S20 spherical -54.2710 1.0000 1.72835 25.89450 14.5763 S21 spherical 35.9917 23.6598 14.3934 S22 spherical Infinite 2.0000 1.5168 64.1987 20.8918 S23 spherical Infinite 1.0000 21.3033 S24 spherical Infinite - 21.6238

[0155] In Table 7, the surface numbers are assigned according to the surface sequence of each lens. For example, surfaces S1 and S2 are the object-side and image-side surfaces of the first lens L1, respectively; surfaces S3 and S4 are the object-side and image-side surfaces of the second lens L2, respectively, and so on. "STO" represents the aperture stop of the lens. The radius of curvature represents the degree of curvature of the corresponding lens surface. A positive value indicates that the surface bends towards the image side, and a negative value indicates that the surface bends towards the object side. "INF" indicates that the surface is flat and the radius of curvature is infinite. "IMA" represents the image side. The thickness represents the central axial distance between the current surface and the next surface. The refractive index nd represents the ability of the material between the current surface and the next surface to deflect light. A blank space indicates that the current position is air and the refractive index is 1. The Abbe number vd is an index used to represent the dispersion ability of a transparent medium. The more severe the dispersion of the medium, the smaller the Abbe number; conversely, the less severe the dispersion of the medium, the larger the Abbe number.

[0156] In this third embodiment, the eighth lens L8 and the ninth lens L9 are aspherical lenses, with both their object-side and image-side surfaces being aspherical. Their aspherical surface shape equation Z satisfies:

[0157] In Embodiment 3 of this application, the aspherical lens of the full-frame lens 100 satisfies the following formula:

[0158] ;

[0159] Where z is the axial distance from the vertex of the surface at a position perpendicular to the optical axis and at a height of r along the optical axis; r is the height of the aspherical surface; c is the curvature of the fitted sphere, which is numerically the reciprocal of the radius of curvature; and k is the fitted conic coefficient. These are the higher-order aspheric coefficients of the 4th, 6th, 8th, 10th, 12th, and 14th orders corresponding to aspheric surfaces; These are combined to form higher-order terms corresponding to the aspherical surface. The units for Z, r, and c are all mm.

[0160] Table 8 Aspherical coefficients of the lens system

[0161] Face number 𝑘 𝑎4 𝑎6 𝑎8 S14 0.82270 -6.21475013121E-06 -3.43386286150E-08 2.69526230088E-10 S15 0.42744 1.61795739534E-05 2.14698646858E-08 -4.07819518284E-10 S16 -50.00000 3.45339940111E-05 1.08257181031E-07 -1.49379917489E-09 S17 11.42350 3.68782587827E-05 5.65142436784E-08 -5.43896686764E-10

[0162] Face number S14 -2.79909147858E-12 1.43620415786E-14 -3.02888215091E-17 S15 1.28771545861E-12 1.26041058990E-15 -1.31098364164E-17 S16 4.95578642938E-12 -2.40017389990E-15 -1.44128340428E-17 S17 -2.98120557694E-12 2.80234705344E-14 -6.32596905353E-17

[0163] In Table 8, -6.21475013121E-06 represents the coefficient for surface number S14. -6.21475013121*10 -6 And so on.

[0164] In Example 3, when the working object distance is infinity and 290mm, the position of the focus movement group (values ​​of D15 and D17), the half field of view, and the breathing rate data are shown in Table 9:

[0165] Table 9. System Breathing Rate of a Full-Frame Lens at Different Object Distances

[0166] Object distance / mm D15 D17 Maximum image height half field of view respiratory rate Infinite 1.0050 7.5702 32.2533 - 1500 1.7818 6.7934 32.1923 0.19% 290 5.0747 3.5005 31.9692 0.88%

[0167] The formula for calculating the breathing rate when focusing at different object distances is:

[0168]

[0169] In fact, w represents the maximum image height half-field angle when the distance is not infinite. The maximum image height half-field angle at infinity.

[0170] As shown in Table 9, at different object distances, the absolute value of the breathing rate of the full-frame lens provided in Example 3 is less than 0.90%, which belongs to a low breathing effect optical system.

[0171] Furthermore, several performance tests were conducted on the full-frame lens 100 provided in Embodiment 3, and the specific test results are as follows:

[0172] Figure 10 for Figure 9 The provided distortion curve for a full-frame lens at infinity is shown. Figure 11 for Figure 9 The provided graph shows the distortion curve of a full-frame lens at a 290mm object distance. In the coordinate system, the horizontal axis represents the magnitude of distortion (%), and the vertical axis represents the normalized image height.

[0173] There is no unit. (By) Figure 10 and Figure 11 As can be seen, the distortion of the lens provided in this embodiment is well corrected from infinity to 290mm, which can better ensure the realism of object imaging, and the imaging distortion is <1%.

[0174] Figure 12 for Figure 9 The provided MTF curve for a full-frame lens at infinity is shown. The horizontal axis represents spatial frequency, indicating the number of black and white line pairs per millimeter (m). The vertical axis represents the modulation index (M' / M), where M refers to the pre-image grating modulation degree, and M' refers to the post-image grating modulation degree; therefore, 0 ≤ M' / M ≤ 1. The MTF curve represents the resolving power of the optical system at different frequencies in different fields of view, meridional, and sagittal directions. It reflects the degree of image quality after the object passes through the optical system; the higher the MTF, the higher the image quality of the lens. Figure 12 It can be seen that the MTF of this optical system at infinity object distance is greater than 0.5 in all meridional and sagittal directions of the field of view in all fields of view at a spatial frequency of 30 lp / mm, which has a very high imaging effect for movie lenses.

[0175] In summary, the optical physical parameters of the first lens to the eleventh lens in Embodiments 1, 2 and 3 of this application are shown in Table 10.

[0176] Table 10 Design values ​​of optical physical parameters of the lens system

[0177] Scope of protection Example 1 Example 2 Example 3 lower limit upper limit <![CDATA[(f (G3) / f inf )-(f (G3) / f 290) ]]> 0.2164 0.1480 0.1864 0.1480 0.2164 <![CDATA[ (f (G3) / f inf )-(f (G3) / f 1500) ]]> 0.0423 0.0288 0.0358 0.0288 0.0423 <![CDATA[Nd (8) +Nd (9) ]]> 3.6853 3.5016 3.5029 3.5016 3.6853 <![CDATA[T (S10-14) / T (S10-20) ]]> 0.6347 0.6086 0.6230 0.6086 0.6347 <![CDATA[f (L1-2) / f (G1) ]]> -1.9575 -0.9528 -1.5793 -1.9575 -0.9528 <![CDATA[Vd (L2) _+ CEO (L4) ]]> 137.2488 90.3934 121.9044 90.3934 137.2488 <![CDATA[Φ (G4) \F (inf) ]]> -0.2839 -0.0437 -0.0810 -0.2839 -0.0437

[0178] Note that the above are merely preferred embodiments and the technical principles employed in this application. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A full-frame lens, characterized in that, It includes a first lens group with positive optical power, an aperture, a second lens group with positive optical power, a third lens group with negative optical power, and a fourth lens group with negative optical power, arranged sequentially from the object side to the image side along the optical axis. The first lens group, the second lens group, and the fourth lens group are a fixed group; when the focal point shifts at different object distances, the third lens group moves along the optical axis to focus; The first lens group consists of a first lens with positive optical power, a second lens with negative optical power, a third lens with negative optical power, a fourth lens with positive optical power, and a fifth lens with positive optical power, arranged sequentially from the object side to the image side. The second lens group consists of a sixth lens with negative optical power, a seventh lens with positive optical power, and an eighth lens with positive optical power arranged sequentially from the object side to the image side. The third lens group has a ninth lens with negative optical power arranged sequentially from the object side to the image side; The fourth lens group consists of a tenth lens with positive optical power and an eleventh lens with negative optical power, arranged sequentially from the object side to the image side.

2. The full-frame lens according to claim 1, characterized in that, The first lens is a convex-concave spherical lens, the second lens is a convex-concave spherical lens, the third lens is a concave-concave spherical lens, the fourth lens is a convex-convex spherical lens, and the fifth lens is a convex-convex or convex-concave spherical lens. The sixth lens is a concave-concave spherical lens, the seventh lens is a convex-convex or convex-concave spherical lens, and the eighth lens is a convex-convex aspherical lens; The ninth lens is a convex-concave aspherical lens; The tenth lens is a convex-convex spherical lens, and the eleventh lens is a concave-concave spherical lens.

3. The full-frame lens according to claim 1, characterized in that, All of the first to the eleventh lenses are glass lenses.

4. The full-frame lens according to claim 1, characterized in that, The ratio of the third lens group to the focal length of the full-frame lens at different object distances must meet the following requirements: 0.0288≤(f (G3) / f inf )-(f (G3) / f 1500 )≤0.0423; 0.1480≤(f (G3) / f inf )-(f (G3) / f 290 )≤0.2164; Among them, f (G3) f represents the focal length of the third lens group. inf f represents the focal length of the full-frame lens at infinity. 1500 This indicates the focal length of the full-frame lens at a 1500mm object distance, f. 290 This indicates the focal length of the full-frame lens at an object distance of 290mm.

5. The full-frame lens according to claim 1, characterized in that, The refractive indices of the eighth lens and the ninth lens meet the following requirements: 3.5016≤Nd (8) +Nd (9) ≤3.6853; Among them, Nd (8) Nd represents the refractive index of the eighth lens L8. (9) This represents the refractive index of the ninth lens.

6. The full-frame lens according to claim 1, characterized in that, The positional relationship between the eighth to eleventh lenses and the aperture stop satisfies the following requirements: 0.6086≤T (S10-14) / T (S10-20) ≤0.6347; Among them, T (S10-14) T represents the thickness from the aperture stop to the image aspect of the eighth lens. (S10-20) This indicates the thickness of the image from the aperture stop to the eleventh lens.

7. The full-frame lens according to claim 1, characterized in that, The first lens and the second lens form a first cemented lens group with negative optical power; The third lens and the fourth lens form a second cemented lens group with negative optical power; The sixth lens and the seventh lens together form a third cemented lens group with negative optical power.

8. The full-frame lens according to claim 7, characterized in that, The focal lengths of the first cemented lens group and the first lens group meet the following requirements: -1.9575≤f (L1-2) / f (G1) ≤-0.9528; Among them, f (L1-2) f represents the focal length of the first cemented lens group. (G1) This indicates the focal length of the first lens group.

9. The full-frame lens according to claim 1, characterized in that, The Abbe numbers of the second lens and the fourth lens must meet the following requirements: 90.3934≤Vd (L2) + CEO (L4) ≤137.2488; Among them, Vd (L2) Vd represents the Abbe number of the second lens. (L4) This indicates the Abbe number of the fourth lens.

10. The full-frame lens according to claim 1, characterized in that, The optical power of the fourth lens group and the full-frame lens at infinity satisfies the following relationship: -0.2839≤Φ (G4) / F (inf) ≤-0.0437; Where, Φ (G4) Φ represents the optical power of the fourth lens group. (inf) This indicates the optical focal length of the full-frame lens at infinity.

Images