A zoom motion picture lens

Abstract

The application belongs to the technical field of optical lenses, and specifically provides a zoom movie lens, which comprises, from the object side to the image side, a first fixed lens group, a variable magnification lens group, a compensation lens group, a variable aperture and a second fixed lens group; the optical power of the first fixed lens group is positive; the optical power of the variable magnification lens group is negative; the optical power of the compensation lens group is positive; the optical power of the second fixed lens group is positive; wherein the variable magnification lens group and the compensation lens group are linked and arranged. The zoom movie lens provided by the application increases the resolution of the zoom movie lens and improves the stability of the performance of the zoom movie lens by adopting the four-lens group structure with positive, negative, positive and positive optical powers; the linked arrangement of the variable magnification lens group and the compensation lens group can ensure that the image surface is not moved during continuous zooming, realize parfocalization in the zooming process, and meet better image quality requirements.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of optical lenses, and more particularly to a zoom movie lens. BACKGROUND

[0002] With the development of the movie lens industry and the continuous enrichment of film and television photography equipment, the inconvenience of fixed focus lenses gradually becomes more and more apparent. It is too troublesome to switch lenses, and zoom lenses are gradually more widely used in the film industry.

[0003] The zoom lens can allow the photographer to shoot different scenes without moving based on its own advantages. The zoom lens can allow the photographer to choose different focal lengths and reduce camera fog. However, the zoom lenses on the market generally have the problems of heavy lens and low resolution. SUMMARY

[0004] The purpose of the embodiment of the application is to provide a zoom movie lens to solve the technical problems of heavy lens and low resolution in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the application is to provide a zoom movie lens, comprising a first fixed lens group, a variable magnification lens group, a compensation lens group, a variable aperture and a second fixed lens group arranged in order from the object side to the image side; the optical power of the first fixed lens group is positive; the optical power of the variable magnification lens group is negative; the optical power of the compensation lens group is positive; the optical power of the second fixed lens group is positive; wherein the variable magnification lens group and the compensation lens group are linked and set.

[0006] Optionally, the zoom movie lens satisfies the following relationship: 2.43≤TTL / Ft≤4.6; 2.8≤Ft / Fw≤435; 2.4≤Fno≤3.8;

[0007] Wherein, TTL is the total optical length of the zoom movie lens, Ft is the focal length of the zoom movie lens in the telephoto state, Fw is the focal length of the zoom movie lens in the wide-angle state, and Fno is the aperture number of the zoom movie lens.

[0008] Optionally, the moving stroke of the variable magnification lens group and the moving stroke of the compensation lens group satisfy the following relationship: 0.88≤S2 / S3≤1.45;

[0009] Wherein, S2 is the moving stroke of the variable magnification lens group, and S3 is the moving stroke of the compensation lens group.

[0010] Optionally, the focal length of the variable magnification lens group and the focal length of the compensation lens group satisfy the following relationship: -0.86≤Fg2 / Fg3≤-0.52;

[0011] wherein Fg2 is a focal length of the variable lens group, and Fg3 is a focal length of the compensation lens group.

[0012] Optionally, the zoom cinema lens satisfies the following relationship: H / Fw≥1.48;

[0013] wherein H is an image height of the zoom cinema lens, and Fw is a focal length of the zoom cinema lens at the wide-angle end.

[0014] Optionally, the first fixed lens group comprises, in order from the object side to the image side, a first lens, a second lens, a first cemented lens, a third lens, and a fourth lens; the first lens has a negative refractive power; the second lens has a negative refractive power; the first cemented lens has a positive refractive power; the third lens has a positive refractive power; and the fourth lens has a positive refractive power.

[0015] Optionally, a focal length of the first cemented lens and a focal length of the first fixed lens group satisfy the following relationship: FJ1 / FG1≥8;

[0016] wherein FJ1 is a focal length of the first cemented lens, and FG1 is a focal length of the first fixed lens group.

[0017] Optionally, the variable lens group comprises, in order from the object side to the image side, a fifth lens and a second cemented lens; the fifth lens has a negative refractive power; and the second cemented lens has a positive refractive power.

[0018] The compensation lens group comprises, in order from the object side to the image side, a sixth lens and a third cemented lens; the sixth lens has a positive refractive power; and the third cemented lens has a positive refractive power.

[0019] Optionally, the second fixed lens group comprises, in order from the object side to the image side, a fourth cemented lens, a seventh lens, a fifth cemented lens, an eighth lens, a ninth lens, and a tenth lens; the fourth cemented lens has a negative refractive power; the seventh lens has a positive refractive power; the fifth cemented lens is a three-cemented lens with a negative refractive power; the eighth lens has a negative refractive power; the ninth lens has a positive refractive power; and the tenth lens has a positive refractive power.

[0020] As another optional solution, the second fixed lens group comprises, in order from the object side to the image side, a fourth cemented lens, a fifth cemented lens, an eleventh lens, an eighth lens, and a ninth lens; the fourth cemented lens has a negative refractive power; the fifth cemented lens is a three-cemented lens with a negative refractive power; the eleventh lens has a positive refractive power; the eighth lens has a negative refractive power; and the ninth lens has a positive refractive power.

[0021] The zoom movie lens provided by the application has the beneficial effects that:

[0022] (1) Compared with the prior art, in the application, by adopting a four-lens group structure with positive, negative, positive and positive optical powers, on the one hand, the resolution of the zoom movie lens is increased, and the stability of the performance of the zoom movie lens is improved; on the other hand, the structure is simple and compact, and the overall weight is reduced.

[0023] (2) Compared with the prior art, in the application, the movement of the zoom lens group can realize the focal length magnification change, the movement of the compensation lens group is used to compensate for the image surface movement caused by the movement of the zoom lens group, the zoom lens group and the compensation lens group are set in linkage, which can ensure that the image surface is not moved during continuous zooming, realize parfocalization in the zooming process, and meet better image quality requirements. BRIEF DESCRIPTION OF DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0025] Figure 1 is a structure schematic view of the wide-angle end when the object distance of the zoom movie lens provided by Example 1 of the application is infinite;

[0026] Figure 2 is a structure schematic view in the process of changing the wide-angle end to the telephoto end when the object distance of the zoom movie lens provided by Example 1 of the application is infinite;

[0027] Figure 3 is a structure schematic view of the telephoto end when the object distance of the zoom movie lens provided by Example 1 of the application is infinite;

[0028] Figure 4 is an on-axis chromatic aberration schematic view of the wide-angle end when the object distance of the zoom movie lens provided by Example 1 of the application is infinite;

[0029] Figure 5 is an on-axis chromatic aberration schematic view in the process of changing the wide-angle end to the telephoto end (the middle focal length end) when the object distance of the zoom movie lens provided by Example 1 of the application is infinite;

[0030] Figure 6 is an on-axis chromatic aberration schematic view of the telephoto end when the object distance of the zoom movie lens provided by Example 1 of the application is infinite;

[0031] Figure 7 is a distortion diagram of the wide-angle end when the object distance of the zoom movie lens provided by Example 1 of the application is infinite;

[0032] Figure 8 is a distortion map of the wide-angle end of the zoom cinema lens of Example 1 of the present application as the object distance approaches infinity;

[0033] Figure 9 is a distortion map of the telephoto end of the zoom cinema lens of Example 1 of the present application as the object distance approaches infinity;

[0034] Figure 10 is a lateral chromatic aberration map of the wide-angle end of the zoom cinema lens of Example 1 of the present application as the object distance approaches infinity;

[0035] Figure 11 is a lateral chromatic aberration map of the wide-angle end of the zoom cinema lens of Example 1 of the present application as the object distance approaches infinity;

[0036] Figure 12 is a lateral chromatic aberration map of the telephoto end of the zoom cinema lens of Example 1 of the present application as the object distance approaches infinity;

[0037] Figure 13 is an MTH map of the wide-angle end of the zoom cinema lens of Example 1 of the present application as the object distance approaches infinity;

[0038] Figure 14 is an MTH map of the wide-angle end of the zoom cinema lens of Example 1 of the present application as the object distance approaches infinity;

[0039] Figure 15 is an MTH map of the telephoto end of the zoom cinema lens of Example 1 of the present application as the object distance approaches infinity;

[0040] Figure 16 is a structural schematic diagram of the wide-angle end of the zoom cinema lens of Example 2 of the present application as the object distance approaches infinity;

[0041] Figure 17 is a structural schematic diagram of the wide-angle end of the zoom cinema lens of Example 2 of the present application as the object distance approaches infinity;

[0042] Figure 18 is a structural schematic diagram of the telephoto end of the zoom cinema lens of Example 2 of the present application as the object distance approaches infinity.

[0043] In the drawings:

[0044] G1 - first fixed lens group; G2 - variable magnification lens group; G3 - compensation lens group; G4 - second fixed lens group; ST - variable aperture stop;

[0045] L1 - first lens; L2 - second lens; L3 - third lens; L4 - fourth lens; L5 - fifth lens; L6 - sixth lens; L7 - seventh lens; L8 - eighth lens; L9 - ninth lens; L10 - tenth lens; L11 - eleventh lens;

[0046] J1 - first cemented lens; J2 - second cemented lens; J3 - third cemented lens; J4 - fourth cemented lens; J5 - fifth cemented lens. DETAILED DESCRIPTION

[0047] In order to make the technical problems to be solved by the present application, technical solutions and beneficial effects clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not used to limit the present application.

[0048] It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0049] In addition, the terms "first", "second" are only used for description purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0050] Embodiment 1:

[0051] Please see Figures 1 to 3 , now the zoom movie lens provided by the embodiments of the present application will be described. The zoom movie lens comprises, arranged in order from the object side to the image side, a first fixed lens group G1, a variable magnification lens group G2, a compensation lens group G3, a variable aperture ST and a second fixed lens group G4; the power of the first fixed lens group G1 is positive; the power of the variable magnification lens group G2 is negative; the power of the compensation lens group G3 is positive; the power of the second fixed lens group G4 is positive; wherein the variable magnification lens group G2 and the compensation lens group G3 are linked and arranged, i.e. the variable magnification lens group G2 and the compensation lens group G3 can move simultaneously. Figures 1 to 3 IMG in the figure is the image plane, and the direction from the object side to the image side is the direction from left to right in the figure.

[0052] Compared with the prior art, the zoom movie lens provided in the embodiments of the present application adopts a four-lens group structure with positive, negative, positive and positive optical powers. On the one hand, the resolution of the zoom movie lens is increased, and the stability of the performance of the zoom movie lens is improved. On the other hand, the structure is simple and compact, and the overall weight is reduced. The movement of the variable magnification lens group G2 can realize the focal length magnification change, and the movement of the compensation lens group G3 is used to compensate for the image surface movement caused by the movement of the variable magnification lens group G2. The variable magnification lens group G2 and the compensation lens group G3 are jointly arranged, which can ensure that the image surface is not moving during continuous zooming, realize parfocal during zooming, and meet better image quality requirements.

[0053] In an embodiment of the present application, in order to make the structure more compact and meet the miniaturization design, the zoom movie lens meets the following relationship:

[0054] 2.43≤TTL / Ft≤4.6;

[0055] 2.8≤Ft / Fw≤435;

[0056] 2.4≤Fno≤3.8;

[0057] Wherein, TTL is the total optical length of the zoom movie lens, Ft is the focal length of the zoom movie lens in the telephoto state, Fw is the focal length of the zoom movie lens in the wide-angle state, and Fno is the aperture number of the zoom movie lens.

[0058] In an embodiment of the present application, the zoom movie lens further comprises a cam mechanism for realizing the linkage of the variable magnification lens group G2 and the compensation lens group G3. The machining precision and surface quality of the cam groove in the cam mechanism directly affect the imaging quality of the zoom movie lens. In order to make the overall trend of light smooth and facilitate the machining of the cam groove in the cam mechanism, the movement stroke of the variable magnification lens group G2 and the movement stroke of the compensation lens group G3 meet the following relationship:

[0059] 0.88≤S2 / S3≤1.45;

[0060] Wherein, S2 is the movement stroke of the variable magnification lens group G2, and S3 is the movement stroke of the compensation lens group G3.

[0061] In an embodiment of the present application, in order to realize the miniaturization of the zoom movie lens and reasonably distribute the optical power, the focal length of the variable magnification lens group G2 and the focal length of the compensation lens group G3 meet the following relationship:

[0062] -0.86≤Fg2 / Fg3≤-0.52;

[0063] Wherein, Fg2 is the focal length of the variable lens group G2, and Fg3 is the focal length of the compensation lens group G3.

[0064] In an embodiment of the present application, in order to control the image height of the zoom cinema lens and thus ensure the imaging quality of the zoom cinema lens, the zoom cinema lens satisfies the following relationship:

[0065] H / Fw≥1.48;

[0066] Wherein, H is the image height of the zoom cinema lens, and Fw is the focal length of the zoom cinema lens at the wide-angle end.

[0067] Please refer to Figures 7 to 9 As can be seen from the figure, the distortion of the zoom cinema lens is well corrected in the embodiment.

[0068] In an embodiment of the present application, please refer to Figures 1 to 3 , the first fixed lens group G1 includes, arranged in order from the object side to the image side, a first lens L1, a second lens L2, a first cemented lens J1, a third lens L3, and a fourth lens L4; the first lens L1 has a negative refractive power; the second lens L2 has a negative refractive power; the first cemented lens J1 has a positive refractive power; the third lens L3 has a positive refractive power; and the fourth lens L4 has a positive refractive power. The first fixed lens group G1 is used to reduce the angle of light and correct aberration.

[0069] In the embodiment, the cemented lens is generally a lens formed by cementing two single lenses, which can minimize chromatic aberration or eliminate chromatic aberration. The achromatic design also helps to minimize spherical aberration.

[0070] The structure of the lens itself is very complex, and the lens group is even more so. Different lenses have different functions. When shooting, the focusing lens group in the lens starts to move to focus. Due to the movement of part of the lens group, sometimes this displacement will affect the position of other lenses and lens groups. Although it is only a tiny change, it will also cause a slight zoom effect. This change is called the "breathing effect" of the lens. The reaction to the picture is that when the focus is switched, the image in the picture will change in size. This phenomenon occurs both inside and outside the focus.

[0071] In an embodiment of the present application, in order to suppress the generation of the breathing effect, the focal length of the first cemented lens J1 and the focal length of the first fixed lens group G1 satisfy the following relationship:

[0072] FJ1 / FG1≥8;

[0073] Wherein, FJ1 is the focal length of the first cemented lens J1, and FG1 is the focal length of the first fixed lens group G1.

[0074] The first cemented lens J1 can perform floating focusing, ensuring that both close-range and long-range images can be formed. The light incidence angle of the first cemented lens J1 is small, so that a longer focusing stroke can be ensured, the focusing is more accurate, and the phenomenon of out-of-focus during focusing does not occur.

[0075] In an embodiment of the present application, referring to Figures 1 to 3 , the variable magnification lens group G2 includes a fifth lens L5 and a second cemented lens J2 arranged in sequence from the object side to the image side; the fifth lens L5 has a negative refractive power; the second cemented lens J2 has a positive refractive power; and the variable magnification lens group G2 moves to realize the change of focal length magnification.

[0076] In an embodiment of the present application, referring to Figures 1 to 3 , the compensation lens group G3 includes a sixth lens L6 and a third cemented lens J3 arranged in sequence from the object side to the image side; the sixth lens L6 has a positive refractive power; the third cemented lens J3 has a positive refractive power. The compensation lens group G3 moves to compensate for the image surface movement caused by the movement of the variable magnification lens group G2.

[0077] In the embodiment, the second fixed lens group G4 includes a fourth cemented lens J4, a seventh lens L7, a fifth cemented lens J5, an eighth lens L8, a ninth lens L9 and a tenth lens L10 arranged in sequence from the object side to the image side; the fourth cemented lens J4 has a negative refractive power; the seventh lens L7 has a positive refractive power; the fifth cemented lens J5 is a three-cemented lens with a negative refractive power; the eighth lens L8 has a negative refractive power; the ninth lens L9 has a positive refractive power; and the tenth lens L10 has a positive refractive power. The three-cemented lens is a lens formed by cementing three single lenses, which can better correct chromatic aberration.

[0078] Referring to Figures 4 to 6 and Figures 10 to 12 , the embodiment better corrects the on-axis chromatic aberration and off-axis chromatic aberration of the zoom movie lens, so that the imaging image does not have obvious purple and red edges or the phenomenon of blurred image, which meets the high-resolution image quality requirement.

[0079] In the embodiment, the conditional data of the zoom movie lens please refer to Table 1, and the lens parameters please refer to Table 2.

[0080] Table 1:

[0081] FJ1 / FG1 9.84 TTL / Ft 3.57 Ft / Fw 3.5 Fno 3 S2 / S3 1.01 Fg2 / Fg3 -0.67 H / Fw 1.55

[0082] Table 2:

[0083]

[0084]

[0085]

[0086] In Table 2, the surface number column shows the surface number of the object side surface when the surface number is increased one by one from the first surface toward the image side; the curvature radius column shows the curvature radius of a certain lens, and when the curvature radius is positive, it indicates that the surface is curved toward the object side, and when the curvature radius is negative, it indicates that the surface is curved toward the image side; and the center thickness column shows the surface interval on the optical axis between the surface and the surface adjacent to it on the image side.

[0087] D1 is the interval between the second lens L2 and the first cemented lens J1, and D2 is the interval between the first cemented lens J1 and the third lens L3. D1 and D2 ensure the focusing movement of the first cemented lens J1 to complete the focusing from the closest distance to infinity, and the entire focusing stroke is 15.848 mm. The value of D1 varies from 22.791 mm to 6.943 mm, and the value of D2 varies from 0.2 mm to 16.094 mm accordingly.

[0088] D3 is the interval between the fourth lens L4 and the fifth lens L5, D4 is the interval between the second cemented lens J2 and the sixth lens L6, and D5 is the interval between the third cemented lens J3 and the variable aperture stop ST. D3, D4, and D5 ensure the linkage of the variable magnification lens group G2 and the compensation lens group G3, and the specific values of D3, D4, and D5 are referred to Table 3.

[0089] Table 3:

[0090] D3(mm) D4(mm) D5(mm) Wide end 1.50847 49.01393 1.5 Wide end to tele end process 16.92679 21.81519 13.28041 Tele end 25.89483 0.5 25.62756

[0091] Please refer to Figures 13 to 15 , the MTH diagram can be drawn according to the MTF diagram, MTF is the initial letter abbreviation of Modulation Transfer Function (Modulation Transfer Function), and H in MTH refers to the image height; different line types in the MTH diagram correspond to different line pairs, and if the curve is higher and flatter, it indicates that the resolution and center edge consistency of the lens are better. As can be seen from the diagram, the zoom movie lens of the embodiment can meet the requirement of high resolution.

[0092] Embodiment 2

[0093] The difference between Embodiment 2 and Embodiment 1 is that the structure of the second fixed lens group G4 is different, and the conditional data and lens parameter values of the zoom movie lens are different.

[0094] In this embodiment, please refer to Figures 16 to 18The second fixed lens group G4 includes, in order from the object side to the image side, a fourth cemented lens J4, a fifth cemented lens J5, an eleventh lens L11, an eighth lens L8, and a ninth lens L9; the fourth cemented lens J4 has a negative refractive power; the fifth cemented lens J5 is a triple cemented lens with a negative refractive power; the eleventh lens L11 has a positive refractive power; the eighth lens L8 has a negative refractive power; and the ninth lens L9 has a positive refractive power.

[0095] In the embodiment, the conditional data of the zoom movie lens are shown in Table 4, and the lens parameters are shown in Table 5.

[0096] Table 4:

[0097] FJ1 / FG1 24.85 TTL / Ft 3.54 Ft / Fw 3.43 Fno 2.6 S2 / S3 1.27 Fg2 / Fg3 -0.78 H / Fw 1.524

[0098] Table 5:

[0099]

[0100]

[0101]

[0102] In Table 5, the surface number column shows the surface number when the surface on the object side is set as the first surface and the number is increased one by one toward the image side; the curvature radius column shows the curvature radius of a certain lens, and when the curvature radius is positive, it indicates that the surface is curved toward the object side, and when the curvature radius is negative, it indicates that the surface is curved toward the image side; and the center thickness column shows the surface interval on the optical axis of each surface and the surface adjacent to it on the image side.

[0103] D1 is the interval between the second lens L2 and the first cemented lens J1, and D2 is the interval between the first cemented lens J1 and the third lens L3. D1 and D2 ensure the focusing movement of the first cemented lens J1 to complete the focusing from the closest distance to infinity, and the entire focusing stroke is 11.186 mm. The value of D1 varies from 14.831 mm to 3.651 mm, and the value of D2 varies from 0.2 mm to 11.386 mm accordingly.

[0104] D3 is the interval between the fourth lens L4 and the fifth lens L5, D4 is the interval between the second cemented lens J2 and the sixth lens L6, and D5 is the interval between the third cemented lens J3 and the variable stop ST. D3, D4, and D5 ensure the linkage of the variable magnification lens group G2 and the compensation lens group G3, and the specific values of D3, D4, and D5 are shown in Table 6.

[0105] Table 6:

[0106] D3(mm) D4(mm) D5(mm) Wide end 0.905 52.956 1 Wide end to tele end process 19.629 24.948 10.285 Tele end 30.277 0.5 24.084

[0107] The above only describes preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A zoom cinema lens characterized in that, The zoom lens comprises a first fixed lens group, a variable magnification lens group, a compensation lens group, a variable aperture and a second fixed lens group arranged in sequence from the object side to the image side; the first fixed lens group has positive refractive power; the variable magnification lens group has negative refractive power; the compensation lens group has positive refractive power; and the second fixed lens group has positive refractive power; The variable magnification lens group and the compensation lens group are arranged in linkage; The first fixed lens group comprises a first lens, a second lens, a first cemented lens, a third lens and a fourth lens arranged in sequence from the object side to the image side; the first lens has negative refractive power; the second lens has negative refractive power; the first cemented lens has positive refractive power; the third lens has positive refractive power; and the fourth lens has positive refractive power; The variable magnification lens group comprises a fifth lens and a second cemented lens arranged in sequence from the object side to the image side; the fifth lens has negative refractive power; and the second cemented lens has positive refractive power; The compensation lens group comprises a sixth lens and a third cemented lens arranged in sequence from the object side to the image side; the sixth lens has positive refractive power; and the third cemented lens has positive refractive power; The moving stroke of the variable magnification lens group and the moving stroke of the compensation lens group satisfy the following relationship: 0.88≤S2 / S3≤1.45; S2 is the moving stroke of the variable magnification lens group, and S3 is the moving stroke of the compensation lens group; The zoom movie lens satisfies the following relationship: H / Fw≥1.48; H is the image height of the zoom movie lens, and Fw is the focal length of the zoom movie lens in the wide-angle state.

2. The zoom cinema lens of claim 1, wherein, The zoom movie lens satisfies the following relationship: 2.43≤TTL / Ft≤4.6; 2.8≤Ft / Fw≤435; 2.4≤Fno≤3.8; TTL is the total optical length of the zoom movie lens, Ft is the focal length of the zoom movie lens in the telephoto state, Fw is the focal length of the zoom movie lens in the wide-angle state, and Fno is the aperture number of the zoom movie lens.

3. The zoom cinema lens of claim 1, wherein, The focal length of the variable magnification lens group and the focal length of the compensation lens group satisfy the following relationship: -0.86≤Fg2 / Fg3≤-0.52; Fg2 is the focal length of the variable magnification lens group, and Fg3 is the focal length of the compensation lens group.

4. The zoom cinema lens of claim 1, wherein, The focal length of the first cemented lens and the focal length of the first fixed lens group satisfy the following relationship: FJ1 / FG1≥8; FJ1 is the focal length of the first cemented lens, and FG1 is the focal length of the first fixed lens group.

5. The zoom cinema lens of claim 1, wherein, The second fixed lens group comprises a fourth cemented lens, a seventh lens, a fifth cemented lens, an eighth lens, a ninth lens and a tenth lens arranged in sequence from the object side to the image side; The fourth cemented lens has negative refractive power; The seventh lens has positive refractive power; The fifth cemented lens is a three-cemented lens with negative refractive power; The eighth lens has negative refractive power; The ninth lens has positive refractive power; The tenth lens has positive refractive power.

6. The zoom cinema lens of claim 1, wherein, The second fixed lens group is composed of a fourth cemented lens, a fifth cemented lens, an eleventh lens, an eighth lens and a ninth lens arranged in order from the object side to the image side; The fourth cemented lens has a negative refractive power; The fifth cemented lens is a three-cemented lens with a negative refractive power; The eleventh lens has a positive refractive power; The eighth lens has a negative refractive power; The ninth lens has a positive refractive power.

Images