A compact inner focusing wide-angle photographic lens

Abstract

The present application discloses a compact inner-focus wide-angle photographic lens. The photographic lens comprises, from the object side to the image side, a first lens group with positive focal power, an aperture stop, a second lens group with positive focal power, and a third lens group with negative focal power; during the focusing process, the second lens group moves along the optical axis toward the object side, and the positions of the first lens group and the third lens group relative to the image plane remain unchanged; the first lens group, the second lens group, and the third lens group satisfy the following conditional formulas: 1≤F1 / F≤3, (1); 0.3≤F2 / F≤2, (2); 0.5≤|F3 / F|≤3, (3). The technical solution of the present application forms a compact inner-focus wide-angle photographic lens by configuring and combining lens groups, and gives a proportional relationship between the composite focal length of each lens group and the composite focal length of the entire photographic lens. By setting the proportional relationship, the size of the entire lens is controlled, thereby achieving the effect of reducing the lens volume, reducing the lens weight, and improving portability.

Description

Technical Field

[0001] The present application relates to the field of camera technology, and in particular to a compact inner-focus wide-angle camera lens. Background Art

[0002] In recent years, the demand for mirrorless cameras in the photography market has been expanding rapidly. Compared with SLR cameras, which are large in size and less portable, mirrorless cameras are small, light and portable due to the elimination of the reflector component. At the same time, thanks to the increasing development and maturity of high-precision CMOS chips, the resolution of cameras is also increasing day by day, making mirrorless cameras also have excellent high-quality imaging quality.

[0003] At present, in order to obtain high image quality, interchangeable wide-angle photography lenses on the market generally have problems such as large size, heavy weight and poor portability.

[0004] Therefore, it is necessary to improve the existing wide-angle photography lens. Summary of the invention

[0005] The present application provides a compact inner-focus wide-angle photographic lens, which aims to solve the problems of large size, heavy weight and poor portability of existing wide-angle photographic lenses.

[0006] To achieve the above-mentioned object, the present application provides a compact inner focusing wide-angle photographic lens, which comprises, from the object side to the image side, a first lens group with positive optical power, an aperture stop, a second lens group with positive optical power, and a third lens group with negative optical power; during the focusing process, the second lens group moves along the optical axis toward the object side, and the positions of the first lens group and the third lens group relative to the image plane remain unchanged;

[0007] The first lens group, the second lens group and the third lens group satisfy the following conditional formula:

[0008] 1≤F1 / F≤3, (1);

[0009] 0.3≤F2 / F≤2, (2);

[0010] 0.5≤|F3 / F|≤3, (3);

[0011] Among them, F1 represents the composite focal length of the first lens group, F2 represents the composite focal length of the second lens group, F3 represents the composite focal length of the third lens group, and F represents the composite focal length of the photographic lens.

[0012] In some embodiments, the first lens group includes at least one lens with an Abbe number Vd≥60.

[0013] In some embodiments, the first lens group includes, from the object side to the image side, a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with negative optical power, and a sixth lens with positive optical power;

[0014] The Abbe number Vd1 of the first lens is ≥60, the Abbe number Vd6 of the sixth lens is ≥60; the fourth lens, the fifth lens and the sixth lens are combined into a first cemented lens.

[0015] In some embodiments, the first lens group includes, from the object side to the image side, a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with positive optical power, and a sixth lens with negative optical power;

[0016] The Abbe number Vd1 of the first lens is ≥60; the second lens and the third lens are combined into a second cemented lens, and the fifth lens and the sixth lens are combined into a third cemented lens.

[0017] In some embodiments, the lens of the second lens group adjacent to the aperture stop has negative optical power, and the lens adjacent to the aperture stop and the second lens group satisfy the conditional formula:

[0018] 0.2≤|F21 / F2|≤6, (4);

[0019] Wherein, F21 is the focal length of the lens adjacent to the aperture stop in the second lens group.

[0020] In some embodiments, the second lens group includes, from the object side to the image side, a seventh lens having negative refractive power and an eighth lens having positive refractive power.

[0021] In some embodiments, the second lens group includes, from the object side to the image side, a seventh lens having negative power, an eighth lens having positive power, and a ninth lens having positive power.

[0022] In some embodiments, the third lens group includes, from the object side to the image side, a tenth lens having negative refractive power and an eleventh lens having positive refractive power;

[0023] Wherein, the tenth lens and the eleventh lens are combined into a fourth cemented lens.

[0024] In some embodiments, the third lens group includes, from the object side to the image side, a ninth lens having negative optical power, a tenth lens having negative optical power, and an eleventh lens having positive optical power;

[0025] Wherein, the tenth lens and the eleventh lens are combined into a fifth cemented lens.

[0026] In some embodiments, all lenses in the first lens group, the second lens group, and the third lens group include at least one aspherical lens.

[0027] The technical solution of the present application proposes a compact inner-focus wide-angle photographic lens. The compact inner-focus wide-angle photographic lens comprises three lens groups, wherein the first lens group and the third lens group remain unchanged relative to the image plane, and the second lens group is a focusing lens group; the first lens group, the second lens group and the third lens group satisfy the following conditions: 1≤F1 / F≤3, (1); 0.3≤F2 / F≤2, (2); 0.5≤|F3 / F|≤3, (3); wherein F1 represents the synthetic focal length of the first lens group, F2 represents the synthetic focal length of the second lens group, F3 represents the synthetic focal length of the third lens group, and F represents the synthetic focal length of the photographic lens. The technical solution of the present application forms a compact inner-focus wide-angle photographic lens by configuring and combining lens groups, and further provides a proportional relationship between the synthetic focal length of each lens group and the synthetic focal length of the entire photographic lens. By setting the proportional relationship, the size of the entire lens is controlled, thereby achieving the effect of reducing the lens volume, reducing the lens quality and improving the portability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0029] Figure 1 A schematic diagram showing the structure of Embodiment 1 of the present invention is shown;

[0030] Figure 2 A schematic diagram showing spherical aberration of Embodiment 1 of the present invention when in focus at infinity is shown;

[0031] Figure 3 A schematic diagram showing field curvature and distortion of embodiment 1 of the present invention when focusing at infinity is shown;

[0032] Figure 4 A schematic diagram showing spherical aberration of Embodiment 1 of the present invention at the minimum focusing distance is shown;

[0033] Figure 5 A schematic diagram showing field curvature and distortion of Embodiment 1 of the present invention at the closest focusing distance is shown;

[0034] Figure 6A schematic diagram showing the structure of Embodiment 2 of the present invention is shown;

[0035] Figure 7 A schematic diagram showing spherical aberration of Embodiment 2 of the present invention when in focus at infinity;

[0036] Figure 8 A schematic diagram showing field curvature and distortion of Embodiment 2 of the present invention when focusing at infinity;

[0037] Fig. 9 A schematic diagram showing spherical aberration of Embodiment 2 of the present invention at the closest focusing distance is shown;

[0038] Fig.10 A schematic diagram showing field curvature and distortion of Embodiment 2 of the present invention at the closest focusing distance is shown;

[0039] Fig.11 A schematic diagram showing the structure of Embodiment 3 of the present invention is shown;

[0040] Fig.12 A schematic diagram showing spherical aberration of Embodiment 3 of the present invention when in focus at infinity is shown;

[0041] Fig.13 A schematic diagram showing field curvature and distortion of embodiment 3 of the present invention when in focus at infinity is shown;

[0042] Fig.14 A schematic diagram showing spherical aberration of Embodiment 3 of the present invention at the closest focusing distance is shown;

[0043] Fig.15 A schematic diagram showing field curvature and distortion of embodiment 3 of the present invention at the closest focusing distance is shown. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] See also Figure 1 As shown, the present application proposes a compact inner-focus wide-angle photography lens, which includes, from the object side to the image side, a first lens group G1 with positive optical power, an aperture stop STP, a second lens group G2 with positive optical power, and a third lens group G3 with negative optical power; during the focusing process, the second lens group G2 moves along the optical axis toward the object side, and the positions of the first lens group G1 and the third lens group G3 relative to the image plane remain unchanged;

[0046] The first lens group G1, the second lens group G2 and the third lens group G3 satisfy the following conditional formula:

[0047] 1≤F1 / F≤3, (1);

[0048] 0.3≤F2 / F≤2, (2);

[0049] 0.5≤|F3 / F|≤3, (3);

[0050] Among them, F1 represents the composite focal length of the first lens group G1, F2 represents the composite focal length of the second lens group G2, F3 represents the composite focal length of the third lens group G3, and F represents the composite focal length of the photographic lens.

[0051] The technical solution of the present application includes, from the object side to the image side, a first lens group G1 with positive power, an aperture stop STP, a second lens group G2 with positive power, and a third lens group G3 with negative power, so that when light passes through each lens group, the refraction and focusing of light can be effectively controlled, thereby achieving high-quality imaging.

[0052] During the focusing process, the second lens group G2 moves along the optical axis toward the object side, while the first lens group G1 and the third lens group G3 remain fixed. This internal focusing design can reduce the length change of the lens during the zooming process and improve its portability.

[0053] Furthermore, the first lens group G1, the second lens group G2 and the third lens group G3 satisfy conditional expressions (1), (2) and (3). These conditional expressions determine the proportional relationship between the composite focal length of each lens group and the composite focal length of the entire photographic lens, thereby ensuring that each lens group maintains the overall optical performance while limiting the variation range of the composite focal length of each lens combination, thereby avoiding volume and quality problems caused by too large or too small a composite focal length.

[0054] In some embodiments, the first lens group G1 includes at least one lens with an Abbe number Vd≥60.

[0055] The Abbe number is an important indicator to measure the dispersion ability of a lens, reflecting the degree of dispersion of light of different wavelengths by the lens. The higher the Abbe number, the smaller the dispersion of the lens, that is, light of different wavelengths can be better focused on the same focal point after passing through the lens, thereby reducing the blurring of color edges and color distortion, and improving the clarity and color reproduction of the image.

[0056] In this embodiment, the first lens group G1 includes at least one lens with an Abbe number Vd≥60, which can effectively correct the imaging problem caused by dispersion and reduce the dispersion phenomenon caused by the wide-angle photography lens having a larger viewing angle and a longer path of light passing through the lens.

[0057] In some embodiments, the first lens group G1 includes, from the object side to the image side, a first lens L01 with negative power, a second lens L02 with negative power, a third lens L03 with positive power, a fourth lens L04 with positive power, a fifth lens L05 with negative power, and a sixth lens L06 with positive power; wherein the Abbe number Vd1 of the first lens L01 is ≥60, and the Abbe number Vd6 of the sixth lens L06 is ≥60; the fourth lens L04, the fifth lens L05, and the sixth lens L06 are combined into a first cemented lens.

[0058] Alternatively, in some embodiments, the first lens group G1 includes, from the object side to the image side, a first lens L01 with negative optical power, a second lens L02 with negative optical power, a third lens L03 with positive optical power, a fourth lens L04 with positive optical power, a fifth lens L05 with positive optical power, and a sixth lens L06 with negative optical power; wherein the Abbe number Vd1 of the first lens L01 is ≥60; the second lens L02 and the third lens L03 form a second cemented lens, and the fifth lens L05 and the sixth lens L06 form a third cemented lens.

[0059] Two specific lens configurations of the first lens group G1 are proposed above. In different configurations of the first lens group G1, lenses with different optical powers are provided, wherein lenses with positive optical power have the ability to converge light, and lenses with negative optical power have the ability to diverge light. Through the combination of lenses with different optical powers, the convergence and divergence of light can be flexibly controlled, and various aberrations, such as spherical aberration, chromatic aberration, astigmatism and distortion, can be effectively corrected to improve the imaging quality.

[0060] Furthermore, in different configurations of the first lens group G1, a cemented lens is also provided. For example, in the first configuration of the first lens group G1, the fourth lens L04, the fifth lens L05 and the sixth lens L06 are combined to form a first cemented lens; in the second configuration of the first lens group G1, the second lens L02 and the third lens L03 form a second cemented lens, and the fifth lens L05 and the sixth lens L06 are combined to form a third cemented lens. Through the design of the cemented lens, high-order aberrations, such as spherical aberration and coma, can be corrected more effectively; at the same time, the cemented lens can also reduce the air space between the lenses, reducing the overall length and weight of the lens.

[0061] In some embodiments, the lens of the second lens group G2 adjacent to the aperture stop STP has negative optical power, and the lens adjacent to the aperture stop and the second lens group G2 satisfy the conditional formula:

[0062] 0.2≤|F21 / F2|≤6, (4);

[0063] Wherein, F21 is the focal length of the lens adjacent to the aperture stop in the second lens group G2.

[0064] In this embodiment, the negative power lens is disposed adjacent to the aperture stop STP, and can correct the aberration caused by the aperture stop STP, thereby optimizing the aberration correction effect of the lens system. The conditional expression (4) reflects the influence of the negative power lens adjacent to the aperture stop STP on the overall synthetic focal length of the second lens group G2. The conditional expression (4) can ensure that the light passing through the negative power lens is effectively controlled, thereby maintaining the imaging clarity and contrast of the system.

[0065] In some embodiments, the second lens group G2 includes, from the object side to the image side, a seventh lens L07 having negative refractive power and an eighth lens L08 having positive refractive power.

[0066] Or in some embodiments, the second lens group G2 includes, from the object side to the image side, a seventh lens L07 with negative refractive power, an eighth lens L08 with positive refractive power, and a ninth lens L09 with positive refractive power.

[0067] Two specific lens configurations of the second lens group G2 are proposed above. Similarly, in different configurations of the second lens group G2, lenses with different optical powers are provided to control the convergence and divergence of light, correct various aberrations such as spherical aberration, chromatic aberration, astigmatism and distortion, and improve imaging quality.

[0068] The second lens group G2 is the focus group of the photographic lens of the present application. The number of lenses in the focus group does not exceed three, which can reduce the weight of the focus group and achieve fast focusing.

[0069] In some embodiments, the third lens group G3 includes, from the object side to the image side, a tenth lens L10 having negative refractive power and an eleventh lens L11 having positive refractive power; wherein the tenth lens L10 and the eleventh lens L11 are combined into a fourth cemented lens.

[0070] Alternatively, in some embodiments, the third lens group G3 includes, from the object side to the image side, a ninth lens L09 with negative refractive power, a tenth lens L10 with negative refractive power, and an eleventh lens L11 with positive refractive power; wherein the tenth lens L10 and the eleventh lens L11 are combined into a fifth cemented lens.

[0071] Two specific lens configurations of the third lens group G3 are proposed above. In different configurations of the third lens group G3, lenses with different optical powers are provided, and cemented lenses are provided in different third lens groups G3, so as to reduce the overall length and weight of the lens while ensuring the imaging quality.

[0072] In some embodiments, all lenses in the first lens group G1 , the second lens group G2 , and the third lens group G3 include at least one aspherical lens.

[0073] Aspherical lenses have better focusing ability, lower astigmatism and distortion, and can provide higher quality images. This embodiment proposes that the compact inner-focus wide-angle camera lens includes at least one aspherical lens, which can be arranged in one or more lens groups of the first lens group, the second lens group and the third lens group.

[0074] For example, in some embodiments, the second lens L02 in the first lens group G1 can be set as an aspherical lens and the ninth lens L09 in the second lens group G2 can be set as an aspherical lens; or, in some embodiments, the seventh lens L07 in the second lens group G2 can be set as an aspherical lens and the ninth lens L09 in the third lens group G3 can be set as an aspherical lens. In this way, a plurality of aspherical lenses can be set to achieve a higher imaging effect.

[0075] In the present application, a parallel glass plate GL configured by a filter is arranged between the last lens of the third lens group G3 and the image plane IMG. The parallel glass plate GL is used to filter light to improve the image quality. Specifically, the parallel glass plate GL can absorb or reflect light of certain wavelengths to eliminate or reduce interference factors such as chromatic aberration and stray light, thereby improving the contrast and clarity of the image.

[0076] The following is a specific embodiment of a compact inner-focus wide-angle camera lens. Example

[0077] Figure 1 FIG. 1 is a schematic diagram of the structure of a compact inner-focus wide-angle photographic lens according to Example 1. Figure 1As shown, in this embodiment, the first lens group G1 includes, from the object side to the image side, a first lens L01 with negative power, a second lens L02 with negative power, a third lens L03 with positive power, a fourth lens L04 with positive power, a fifth lens L05 with negative power, and a sixth lens L06 with positive power; wherein, the Abbe number Vd1 of the first lens L01 is 70.44, and the Abbe number Vd6 of the sixth lens L06 is 81.61; the fourth lens L04, the fifth lens L05, and the sixth lens L06 are combined into a first cemented lens. The second lens group G2 includes, from the object side to the image side, a seventh lens L07 with negative power, an eighth lens L08 with positive power, and a ninth lens L09 with positive power. The third lens group G3 includes, from the object side to the image side, a tenth lens L10 having negative power and an eleventh lens L11 having positive power; wherein the tenth lens L10 and the eleventh lens L11 are combined into a fourth cemented lens. In this embodiment, the composite focal length of the photographic lens is F=29.40, the composite focal length of the first lens group G1 is F1=36.369, the composite focal length of the second lens group G2 is F2=35.643, the focal length of the seventh lens L07 is F21=-23.462, and the composite focal length of the third lens group G3 is F3=-58.754.

[0078] In this embodiment, specific numerical data of the compact inner-focus wide-angle photography lens are shown in Tables 1 to 3:

[0079] Table 1

[0080]

[0081] Table 2

[0082]

[0083] Table 3

[0084]

[0085] Figure 2 and Figure 3 The spherical aberration, field curvature and distortion curves of Example 1 when the image is in focus at infinity are shown. Figure 4 and Figure 5 The spherical aberration, field curvature and distortion curves of Example 1 when the lens is in focus at the closest distance are shown.

[0086] The spherical aberration curve diagram represents the spherical aberration curve when the aperture number is 2.60, wherein the F line, D line, and C line in the spherical aberration curve represent the spherical aberration at a wavelength of 486nm, a wavelength of 587nm, and a wavelength of 656nm, respectively, the horizontal axis represents the spherical aberration value, and the vertical axis represents the field of view. The field curvature curve diagram represents the field curvature curve when the half field angle ω is 21.63°, and the distortion curve diagram represents the distortion curve when the half field angle ω is 21.63°; wherein the dotted line S in the field curvature curve represents the value of the principal ray D line on the sagittal image plane, the solid line T represents the value of the principal ray D line on the meridional image plane, the horizontal axis represents the field curvature value, and the vertical axis represents the field of view; the horizontal axis in the distortion curve diagram represents the distortion value, and the vertical axis represents the field of view. The above description of various spherical aberrations, field curvatures, and distortion curve diagrams is the same as other embodiments, and will not be repeated below.

[0087] Depend on Figure 2-Figure 5 It can be seen from the figure that the photographic lens of this embodiment 1 has a good imaging effect. Example

[0088] Figure 6 FIG. 2 is a schematic diagram of the structure of a compact inner-focus wide-angle photographic lens according to Embodiment 2. Figure 6 As shown, in this embodiment, the first lens group G1 includes, from the object side to the image side, a first lens L01 with negative power, a second lens L02 with negative power, a third lens L03 with positive power, a fourth lens L04 with positive power, a fifth lens L05 with negative power, and a sixth lens L06 with positive power; wherein, the Abbe number Vd1 of the first lens L01 is 70.44, and the Abbe number Vd6 of the sixth lens L06 is 81.61; the fourth lens L04, the fifth lens L05, and the sixth lens L06 are combined into a first cemented lens. The second lens group G2 includes, from the object side to the image side, a seventh lens L07 with negative power, an eighth lens L08 with positive power, and a ninth lens L09 with positive power. The third lens group G3 includes, from the object side to the image side, a tenth lens L10 having negative power and an eleventh lens L11 having positive power; wherein the tenth lens L10 and the eleventh lens L11 are combined into a fourth cemented lens. The difference between this embodiment and embodiment 1 is that the system parameters are different, wherein the composite focal length of the photographic lens is F=29.40, the composite focal length of the first lens group G1 is F1=36.817, the composite focal length of the second lens group G2 is F2=35.643, the focal length of the seventh lens L07 is F21=-23.044, and the composite focal length of the third lens group G3 is F3=-71.942.

[0089] In this embodiment, specific numerical data of the compact inner-focus wide-angle photography lens are shown in Table 4 to Table 6:

[0090] Table 4

[0091]

[0092] Table 5

[0093]

[0094] Table 6

[0095]

[0096] Figure 7 and Figure 8 The spherical aberration, field curvature and distortion curves of Example 2 when in focus at infinity are shown. Fig. 9 and Fig.10 The spherical aberration, field curvature and distortion curves of Example 2 are shown when the image is in focus at the closest distance.

[0097] Depend on Figure 7-10 It can be seen from the figure that the photographic lens of the second embodiment has a good imaging effect. Example

[0098] Fig.11 FIG. 1 is a schematic diagram of the structure of a compact inner-focus wide-angle photographic lens according to Embodiment 3. Fig.11 As shown, in this embodiment, the first lens group G1 includes, from the object side to the image side, a first lens L01 with negative power, a second lens L02 with negative power, a third lens L03 with positive power, a fourth lens L04 with positive power, a fifth lens L05 with positive power, and a sixth lens L06 with negative power; wherein the Abbe number Vd1 of the first lens L01 is 70.44; the second lens L02 and the third lens L03 form a second cemented lens, and the fifth lens L05 and the sixth lens L06 form a third cemented lens. The second lens group G2 includes, from the object side to the image side, a seventh lens L07 with negative power and an eighth lens L08 with positive power. The third lens group G3 includes, from the object side to the image side, a ninth lens L09 having negative power, a tenth lens L10 having negative power, and an eleventh lens L11 having positive power; wherein the tenth lens L10 and the eleventh lens L11 are combined into a fifth cemented lens. In this embodiment, the composite focal length of the photographic lens is F=27.867, the composite focal length of the first lens group G1 is F1=54.334, the composite focal length of the second lens group G2 is F2=23.371, the focal length of the seventh lens L07 is F21=-102.426, and the composite focal length of the third lens group G3 is F3=-52.518.

[0099] In this embodiment, specific numerical data of the compact inner-focus wide-angle photography lens are shown in Tables 7 to 9:

[0100] Table 7

[0101]

[0102] Table 8

[0103]

[0104] Table 9

[0105]

[0106] Fig.12 and Fig.13 The spherical aberration, field curvature and distortion curves of Example 3 when in infinity focus are shown. Fig.14 and Fig.15 The spherical aberration, field curvature and distortion curves of Example 3 are shown when the image is in focus at the closest distance.

[0107] Depend on Figure 12-Figure 15 It can be seen from the figure that the photographic lens of the present embodiment 3 has a good imaging effect.

[0108] The above description is only a partial or preferred embodiment of the present application. Neither the text nor the drawings can limit the scope of protection of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the overall concept of the present application, or direct / indirect application in other related technical fields are included in the scope of protection of the present application.

Claims

1. A compact inner-focus wide-angle photographic lens, characterized in that: The lens comprises, from the object side to the image side, a first lens group having positive power, an aperture stop, a second lens group having positive power, and a third lens group having negative power, and the number of lens groups having power is three; During the focusing process, the second lens group moves along the optical axis toward the object side, and the positions of the first lens group and the third lens group relative to the image plane remain unchanged; The first lens group, the second lens group and the third lens group satisfy the following conditional formula: 1≤F1 / F≤3, (1); 0.3≤F2 / F≤2, (2); 0.5≤|F3 / F|≤3, (3); Wherein, F1 represents the composite focal length of the first lens group, F2 represents the composite focal length of the second lens group, F3 represents the composite focal length of the third lens group, and F represents the composite focal length of the photographic lens; Among them, all the lenses in the first lens group, the second lens group and the third lens group include at least one aspherical lens; the first lens group is composed of a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with negative optical power and a sixth lens with positive optical power from the object side to the image side; the second lens group is composed of a seventh lens with negative optical power, an eighth lens with positive optical power and a ninth lens with positive optical power from the object side to the image side; the third lens group is composed of a tenth lens with negative optical power and an eleventh lens with positive optical power from the object side to the image side.

2. The compact inner-focus wide-angle photography lens according to claim 1, characterized in that: The Abbe number Vd1 of the first lens is ≥60, and the Abbe number Vd6 of the sixth lens is ≥60; the fourth lens, the fifth lens and the sixth lens are combined into a first cemented lens; and the tenth lens and the eleventh lens are combined into a fourth cemented lens.

3. The compact inner-focus wide-angle photography lens according to claim 1, characterized in that: The lens of the second lens group adjacent to the aperture stop has negative optical power, and the lens adjacent to the aperture stop and the second lens group satisfy the conditional expression: 0.2≤|F21 / F2|≤6, (4); Wherein, F21 is the focal length of the lens adjacent to the aperture stop in the second lens group.

4. A compact inner-focus wide-angle photographic lens, characterized in that: The lens comprises, from the object side to the image side, a first lens group having positive power, an aperture stop, a second lens group having positive power, and a third lens group having negative power, and the number of lens groups having power is three; During the focusing process, the second lens group moves along the optical axis toward the object side, and the positions of the first lens group and the third lens group relative to the image plane remain unchanged; The first lens group, the second lens group and the third lens group satisfy the following conditional formula: 1≤F1 / F≤3, (1); 0.3≤F2 / F≤2, (2); 0.5≤|F3 / F|≤3, (3); Wherein, F1 represents the composite focal length of the first lens group, F2 represents the composite focal length of the second lens group, F3 represents the composite focal length of the third lens group, and F represents the composite focal length of the photographic lens; Among them, all the lenses in the first lens group, the second lens group and the third lens group include at least one aspherical lens; the first lens group is composed of a first lens with negative optical power, a second lens with negative optical power, a third lens with positive optical power, a fourth lens with positive optical power, a fifth lens with positive optical power and a sixth lens with negative optical power from the object side to the image side; the second lens group is composed of a seventh lens with negative optical power and an eighth lens with positive optical power from the object side to the image side; the third lens group is composed of a ninth lens with negative optical power, a tenth lens with negative optical power and an eleventh lens with positive optical power from the object side to the image side.

5. The compact inner-focus wide-angle photography lens according to claim 4, characterized in that: The Abbe number Vd1 of the first lens is ≥60; the second lens and the third lens are combined into a second cemented lens, the fifth lens and the sixth lens are combined into a third cemented lens; the tenth lens and the eleventh lens are combined into a fifth cemented lens.

6. The compact inner-focus wide-angle photography lens according to claim 4, characterized in that: The lens of the second lens group adjacent to the aperture stop has negative optical power, and the lens adjacent to the aperture stop and the second lens group satisfy the conditional expression: 0.2≤|F21 / F2|≤6, (4); Wherein, F21 is the focal length of the lens adjacent to the aperture stop in the second lens group.

Images