An ultra-wide-angle lens for mirrorless cameras

Abstract

The present invention relates to an ultra-wide-angle lens for a mirrorless camera. The ultra-wide-angle lens comprises a first lens group G1 with negative optical power, a second lens group G2 with positive optical power, and a third lens group G3 with positive optical power, which are arranged in sequence along an optical axis from an object side. The first lens group G1 and the second lens group G2 are fixed when an object moves from infinity to a close distance. The relationship between the focal length F1 of the first lens group G1 and the focal length F2 of the second lens group G2 satisfies ‑0.7≤F1 / F2≤‑0.4. The third lens group G3 moves toward the object when the object moves from infinity to a close distance to achieve focusing. The ultra-wide-angle lens has a wide half field of view, a full picture angle of more than 110 degrees, and can well correct various aberrations such as coma, field curvature, and distortion. The ultra-wide-angle lens has a simple structure, is easy to assemble and adjust, can be miniaturized, has high performance, good imaging effect, and low cost, and is conducive to mass production and popular use.

Description

Technical Field

[0001] The invention belongs to the technical field of lenses, and in particular relates to an ultra-wide-angle lens used in a mirrorless camera. Background Art

[0002] A wide-angle lens is a photographic lens with a focal length shorter than a standard lens, a viewing angle greater than a standard lens, a focal length longer than a fisheye lens, and a viewing angle less than a fisheye lens. However, the applicant has found that the refractive powers of the first few lenses of the currently known wide-angle lenses on the market with an angle of view exceeding 100 degrees are mainly negative. Although this structure of multiple negative lenses in the front group can reduce the size and weight of the lens, the chromatic aberration of light of different wavelengths is magnified because there are too many negative lenses in the front group. When the chromatic aberration accumulates, it will be difficult to correct it in the rear lens group, which will eventually lead to a serious decline in the imaging quality of the edge field of view of the lens, and the appearance on the image is severe purple fringing. For this reason, the solution adopted by most manufacturers is to add aspherical lenses to the front lens group and use too much ultra-low dispersion glass in the rear lens group. Although the influence of residual chromatic aberration is solved, the number of lenses is too large, the system is too complicated, and the difficulty of installation and adjustment is large. It is difficult to guarantee the final imaging quality. Too many aspherical lenses will also cause cost increases. Summary of the invention

[0003] In order to solve the above-mentioned problems existing in the prior art, the present invention provides an ultra-wide-angle lens for use in mirrorless cameras, which has a wide half field of view angle, a full angle of view of the lens exceeds 110 degrees, and can well correct various aberrations such as coma, image curvature, and distortion. At the same time, it has a simple structure, is easy to assemble and adjust, can be miniaturized, and has high performance, good imaging effect, and low cost.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] An ultra-wide-angle lens for a mirrorless camera comprises a first lens group G1 with negative optical power, a second lens group G2 with positive optical power, and a third lens group G3 with positive optical power, which are arranged in sequence from an object side along an optical axis, and the first lens group G1 and the second lens group G2 are fixed when an object moves from infinity to a close distance, a relationship between a focal length F1 of the first lens group G1 and a focal length F2 of the second lens group G2 satisfies -0.7≤F1 / F2≤-0.4, and the third lens group G3 moves toward the object when the object moves from infinity to a close distance to achieve focusing.

[0006] Further, the focal length F1 of the first lens group G1 and the focal length F3 of the third lens group G3 satisfy -1≤F1 / F≤-0.75 and 2≤F3 / F≤3, where F is the focal length of the entire optical system in an infinite state.

[0007] Furthermore, the first lens group G1 includes a lens L11, a lens L12 and a lens L13 arranged in sequence from the object side along the optical axis, and a relationship between a focal length F1L11 of the lens L11, a focal length F1L12 of the lens L12 and a focal length F1L13 of the lens L13 and the focal length F1 of the first lens group G1 satisfies 2.2≤F1L11 / F1≤3.3, -4.7≤F1L12 / F1≤-3.6, 1≤F1L13 / F1≤1.5.

[0008] Furthermore, the first lens group G1 includes lens L11, lens L12 and lens L13 arranged in sequence from the object side along the optical axis, the second lens group G2 includes lens L21, lens L22 and lens L23 arranged in sequence from the object side along the optical axis, and the third lens group G3 includes lens L31, lens L32, lens L33, lens L34, lens L35 and lens L36 arranged in sequence from the object side along the optical axis.

[0009] Furthermore, the full picture angle of the lens exceeds 110 degrees.

[0010] Beneficial effects of the present invention:

[0011] Through the above technical scheme, the present invention can have a wide half field of view angle, the full angle of the lens exceeds 110 degrees, and can well correct various aberrations such as coma, image curvature, distortion, etc., and at the same time has a simple structure, easy installation and adjustment, can be miniaturized, and has high performance, good imaging effect, low cost, and is conducive to mass production and popular use. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a structural schematic diagram of a first embodiment of an ultra-wide-angle lens for a mirrorless camera according to the present invention;

[0013] Figure 2 It is a curve diagram of spherical aberration, field curvature aberration, distortion aberration and chromatic aberration of magnification when the ultra-wide-angle lens embodiment 1 used for a mirrorless camera of the present invention is focused at infinity and at a maximum photographic magnification;

[0014] Figure 3 The graph is a graph of spherical aberration, field curvature aberration, distortion aberration and chromatic aberration of magnification when the ultra-wide-angle lens embodiment 1 used for a mirrorless camera according to the present invention is focused at 200mm and at the maximum photographic magnification;

[0015] Figure 4 is a structural schematic diagram of a second embodiment of an ultra-wide-angle lens for a mirrorless camera according to the present invention;

[0016] Figure 5It is a curve diagram of spherical aberration, field curvature aberration, distortion aberration and chromatic aberration of magnification when the second embodiment of the ultra-wide-angle lens for a mirrorless camera described in the present invention is focused at infinity and at a maximum photographic magnification;

[0017] Figure 6 It is a curve diagram of spherical aberration, field curvature aberration, distortion aberration and chromatic aberration of magnification when the second embodiment of the ultra-wide-angle lens for a mirrorless camera described in the present invention is focused at 200mm and at the maximum photographic magnification;

[0018] Figure 7 is a schematic structural diagram of a third embodiment of an ultra-wide-angle lens for a mirrorless camera according to the present invention;

[0019] Figure 8 It is a curve diagram of spherical aberration, field curvature aberration, distortion aberration and chromatic aberration of magnification when the third embodiment of the ultra-wide-angle lens for a mirrorless camera described in the present invention is focused at infinity and at a maximum photographic magnification;

[0020] Fig. 9 The present invention is a graph of spherical aberration, field curvature aberration, distortion aberration and chromatic aberration of magnification when the ultra-wide-angle lens embodiment 3 used in a mirrorless camera is focused at 200mm and has a maximum photographic magnification. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] The present invention discloses an ultra-wide-angle lens for a mirrorless camera, comprising a first lens group G1 with negative optical power, a second lens group G2 with positive optical power, and a third lens group G3 with positive optical power, which are arranged in sequence from an object side along an optical axis, and the first lens group G1 and the second lens group G2 are fixed when an object moves from infinity to a close distance, a relationship between a focal length F1 of the first lens group G1 and a focal length F2 of the second lens group G2 satisfies -0.7≤F1 / F2≤-0.4, and the third lens group G3 moves toward the object when the object moves from infinity to a close distance to achieve focusing. Among them, the first lens group G1 includes lens L11, lens L12 and lens L13 arranged in sequence from the object side along the optical axis, the second lens group G2 includes lens L21, lens L22 and lens L23 arranged in sequence from the object side along the optical axis, and the third lens group G3 includes lens L31, lens L32, lens L33, lens L34, lens L35 and lens L36 arranged in sequence from the object side along the optical axis.

[0023] Thus, the ultra-wide-angle lens used in the mirrorless camera described in the present invention has a wide half-angle of view, and the full angle of view of the lens exceeds 110 degrees (the full angle of view refers to the angle of view that the photosensitive element (camera CCD) can see after imaging through the lens. The angle of view can be measured in the horizontal, vertical or diagonal directions, and here it refers to the diagonal angle of view.), and can well correct various aberrations such as coma, image curvature, and distortion. It has a simple structure, is easy to assemble and adjust, can be miniaturized, and has high performance, good imaging effect, and low cost.

[0024] In a preferred embodiment of the present invention, the focal length F1 of the first lens group G1 and the focal length F3 of the third lens group G3 satisfy -1≤F1 / F≤-0.75 and 2≤F3 / F≤3, where F is the focal length of the entire optical system at infinity. If the focal length F1 of the first lens group G1 and the focal length F3 of the third lens group G3 exceed the lower limit of -1≤F1 / F≤-0.75, various aberrations will occur in large quantities and it will be very difficult to correct them, and it will be difficult to ensure excellent imaging effects. If it exceeds the upper limit of -1≤F1 / F≤-0.75, although it is beneficial to correct aberrations, miniaturization design will be very difficult, resulting in bulky volume and increased cost. If the focal length F1 of the first lens group G1 and the focal length F3 of the third lens group G3 exceed the lower limit of 2≤F3 / F≤3, coma and astigmatism will deteriorate. If it exceeds the upper limit of 2≤F3 / F≤3, spherical aberration and distortion will deteriorate. Therefore, the ultra-wide-angle lens used in the mirrorless camera described in the present invention can maximize the avoidance of aberrations, and the aberrations are beneficial to correction. At the same time, the deterioration of coma and astigmatism, spherical aberration and distortion can be avoided, and the imaging effect is good.

[0025] In another preferred embodiment of the present invention, the first lens group G1 includes a lens L11, a lens L12 and a lens L13 arranged in sequence from the object side along the optical axis, and a relationship between a focal length F1L11 of the lens L11, a focal length F1L12 of the lens L12 and a focal length F1L13 of the lens L13 and the focal length F1 of the first lens group G1 satisfies 2.2≤F1L11 / F1≤3.3, -4.7≤F1L12 / F1≤-3.6, and 1≤F1L13 / F1 ≤1.5. If the focal length F1L11 of lens L11, the focal length F1L12 of lens L12 and the focal length F1L13 of lens L13 and the focal length F1 of the first lens group G1 exceed the lower limit of 2.2≤F1L11 / F1≤3.3, lens L11 becomes smaller, which is very beneficial for achieving a small aperture, but it will be very disadvantageous for achieving a wide-angle lens with a large field of view. If it exceeds the upper limit of 2.2≤F1L11 / F1≤3.3, although it will be very beneficial for achieving a wide-angle lens with a large field of view, the aperture of lens L11 will become larger, and the miniaturization of the entire lens cannot be achieved. If it exceeds the lower limit of -4.7≤F1L12 / F1≤-3.6, the optical power of the first lens group G1 is too weak, the optical power of the second lens group G2 is too strong, various phase differences cannot be effectively balanced, and excellent imaging quality cannot be guaranteed. If it exceeds the upper limit of -4.7≤F1L12 / F1≤-3.6, the first lens group G1 If the focal length of the first lens group G1 is too strong and the focal length of the second lens group G2 is too weak, the outer diameter of the first lens group G1 will become larger, and the purpose of miniaturization of the lens cannot be achieved; if the lower limit of 1≤F1L13 / F1≤1.5 is exceeded, the lens L13 will become smaller, which is very beneficial for realizing a small-aperture lens, but it will be very disadvantageous for realizing a wide-angle lens with a large field of view; if the upper limit of 1≤F1L13 / F1≤1.5 is exceeded, although it will be very beneficial for realizing a wide-angle lens with a large field of view, the aperture of the lens L13 will become larger, and the miniaturization of the entire lens cannot be achieved. Therefore, the ultra-wide-angle lens used in the mirrorless camera described in the present invention can be miniaturized.

[0026] In summary, the ultra-wide-angle lens used in the mirrorless camera described in the present invention can be miniaturized, has high performance, good imaging effect, low cost, and a picture angle of more than 100 degrees.

[0027] The ultra-wide-angle lens used in the mirrorless camera described in the present invention is further described below through three embodiments.

[0028] Embodiment 1

[0029] like Figure 1As shown, an ultra-wide-angle lens for a mirrorless camera described in Embodiment 1 of the present invention comprises a first lens group G1 with negative optical focal length, a second lens group G2 with positive optical focal length, and a third lens group G3 with positive optical focal length, which are arranged in sequence from the object side along the optical axis; wherein the first lens group G1 includes a lens L12 with positive optical focal length. When the object moves from infinity to a close distance, the first lens group G1 and the second lens group G2 are fixed, and the third lens group G3 moves toward the object to achieve focusing. When focusing on infinity or 200mm, and at the maximum photographic magnification, the spherical aberration, field curvature aberration, distortion aberration, and lateral chromatic aberration are as follows: Figure 2 and Figure 3 As shown, g represents light with a wavelength of 436nm, d represents light with a wavelength of 587nm, C represents light with a wavelength of 656nm, △S represents light in the sagittal plane, and △T represents light in the meridian plane.

[0030] The data of the radius, thickness, refractive index, Abbe number of each lens in Example 1, and the interval between each lens are specifically shown in Table 1 below.

[0031] RDY (mm): radius of curvature of each surface;

[0032] THI (mm): the distance between lenses and the thickness of lenses;

[0033] Nd: refractive index of each glass at d line;

[0034] Vd: Abbe number of glass;

[0035] Focus distance: 15;

[0036] Fno: 4;

[0037] Half picture angle ω: 55°;

[0038] Table 1

[0039]

[0040]

[0041] Among them, the values ​​corresponding to various coefficients of the aspherical surface are shown in Table 2 below.

[0042] Table 2

[0043] k <![CDATA[α 2 ]]> <![CDATA[α 3 ]]> <![CDATA[α 4 ]]> <![CDATA[α 5 ]]> <![CDATA[α 6 ]]> 22 0.8975 3.4943e-005 1.2050e-006 -3.6364e-009 -3.5887e-012 -3.5654e-18 23 1.7589 6.6201e-005 5.2244e-007 1.8294e-009 -1.1995e-011 -4.5687e-21

[0044] When THI(13) and THI(23) are equal to different values, the corresponding imaging distances are shown in Table 3, corresponding to infinity (focal length 15 mm) and 200 mm (0.07 times), respectively.

[0045] Table 3

[0046] focal length 15.0mm 0.07 times THI(13) 17.5mm 18.73mm THI(23) 3.36mm 2.13mm

[0047] The shape of an aspherical surface is defined as:

[0048] r: radial coordinate starting from the optical axis;

[0049] Z: The offset in the direction of the optical axis starting from the intersection of the aspheric surface and the optical axis;

[0050] c: the curvature of the reference sphere of the aspheric surface;

[0051] k: conic coefficient of the aspheric surface;

[0052] α 2 : Aspheric fourth-order coefficient;

[0053] α 3 : Aspheric sixth-order coefficient;

[0054] α 4 : Aspheric 8th order coefficient;

[0055] α 5 : Aspheric 10th-order coefficient;

[0056] α 6 : Aspheric 12th order coefficient;

[0057] and

[0058] Embodiment 2

[0059] like Figure 4 As shown, the ultra-wide-angle lens used in a mirrorless camera described in the second embodiment of the present invention comprises a first lens group G1 with negative focal length, a second lens group G2 with positive focal length, and a third lens group G3 with positive focal length, which are arranged in sequence from the object side along the optical axis; wherein the first lens group G1 includes a lens L12 with positive focal length; when the object moves from infinity to a close distance, the first lens group G1 and the second lens group G2 are fixed, and the third lens group G3 moves toward the object to achieve focusing. When focusing on infinity or 200mm, and at the maximum photographic magnification, its spherical aberration, field curvature aberration, distortion aberration, and lateral chromatic aberration are as follows: Figure 5 and Figure 6 As shown, g represents light with a wavelength of 436nm, d represents light with a wavelength of 587nm, C represents light with a wavelength of 656nm, △S represents light in the sagittal plane, and △T represents light in the meridian plane.

[0060] The data of the radius, thickness, refractive index, Abbe number of each lens in Example 2, and the interval between each lens are specifically shown in Table 4 below.

[0061] RDY (mm): radius of curvature of each surface;

[0062] THI (mm): the distance between lenses and the thickness of lenses;

[0063] Nd: refractive index of each glass at d line;

[0064] Vd: Abbe number of glass;

[0065] Focus distance: 15;

[0066] Fno: 4;

[0067] Half picture angle ω: 55°;

[0068] Table 4

[0069] Surface serial number RDY THI Refractive index Nd Abbe number Vd 1 33.91349 1.5 1.922866 20.88 2 16.96778 6.109344 3 44.96154 4.888515 1.846666 23.79 4 893.875 0.3 5 36.56779 1.5 1.910826 35.25 6 10.00625 4.158868 7 68.70796 5.489368 1.846666 23.79 8 -31.81536 0.4052764 9 -23.20924 1.5 1.456500 90.26 10 18.28463 4.421527 11 33.15847 5.84447 1.563885 60.79 12 -15.30984 2.456089 13STO Infinity THI(13) 14 32.95306 4.469699 1.784721 25.72 15 -12.72495 1.5 1.784724 38.6 16 16.75682 5.231483 1.456500 90.27 17 -19.11853 1.954649 18 -14.38173 1.5 1.755205 27.55 19 1973.019 0.3 20 31.77608 7.931122 1.603001 65.21 21 -18.60454 0.950284 22* -21.1037 6.126123 1.787998 47.52 23* -45.14145 THI(23) 24 Inf 2 1.516800 64.17 25 Inf 1

[0070] Among them, the values ​​corresponding to various coefficients of the aspherical surface are shown in Table 5 below.

[0071] Table 5

[0072] k <![CDATA[α 2 ]]> <![CDATA[α 3 ]]> <![CDATA[α 4 ]]> <![CDATA[α 5 ]]> <![CDATA[α 6 ]]> 22 -0.31531 3.8304E-005 5.0698E-007 -2.2429E-009 -5.6585E-012 -4.2647e-18 23 0.01587 5.9011E-005 2.8353E-007 1.0487E-009 -8.8092E-012 -7.2587e-21

[0073] When THI(13) and THI(23) are equal to different values, the corresponding imaging distances are shown in Table 6, corresponding to infinity (focal length 15 mm) and 200 mm (0.07 times), respectively.

[0074] Table 6

[0075] focal length 15.0mm 0.07 times THI(13) 2.96 1.6 THI(23) 17.5 18.86

[0076] The shape of an aspherical surface is defined as:

[0077] r: radial coordinate starting from the optical axis;

[0078] Z: The offset in the direction of the optical axis starting from the intersection of the aspheric surface and the optical axis;

[0079] c: the curvature of the reference sphere of the aspheric surface;

[0080] k: conic coefficient of the aspheric surface;

[0081] α 2 : Aspheric fourth-order coefficient;

[0082] α 3 : Aspheric sixth-order coefficient;

[0083] α 4 : Aspheric 8th order coefficient;

[0084] α 5: Aspheric 10th-order coefficient;

[0085] α 6 : Aspheric 12th order coefficient;

[0086] and

[0087] Embodiment 3

[0088] like Figure 7 As shown, the ultra-wide-angle lens used in a mirrorless camera described in the third embodiment of the present invention comprises a first lens group G1 with negative focal length, a second lens group G2 with positive focal length, and a third lens group G3 with positive focal length, which are arranged in sequence from the object side along the optical axis; wherein the first lens group G1 includes a lens L12 with positive focal length; when the object moves from infinity to a close distance, the first lens group G1 and the second lens group G2 are fixed, and the third lens group G3 moves toward the object to achieve focusing. When focusing on infinity or 200mm, and at the maximum photographic magnification, its spherical aberration, field curvature aberration, distortion aberration, and lateral chromatic aberration are as follows: Figure 8 and Fig. 9 As shown, g represents light with a wavelength of 436nm, d represents light with a wavelength of 587nm, C represents light with a wavelength of 656nm, △S represents light in the sagittal plane, and △T represents light in the meridian plane.

[0089] The data of the radius, thickness, refractive index, Abbe number of each lens in Example 3, and the interval between each lens are specifically shown in Table 7 below.

[0090] RDY (mm): radius of curvature of each surface;

[0091] THI (mm): the distance between lenses and the thickness of lenses;

[0092] Nd: refractive index of each glass at d line;

[0093] Vd: Abbe number of glass;

[0094] Focus distance: 15;

[0095] Fno: 4;

[0096] Half picture angle ω: 55°;

[0097] Table 7

[0098]

[0099]

[0100] Among them, the values ​​corresponding to various coefficients of the aspherical surface are shown in Table 8 below.

[0101] Table 8

[0102] k α2 α3 α4 α5 α6 22 -5.1662 4.5953E-005 2.3960E-007 -3.1545E-009 2.1578E-13 -3.4702E-15 23 0.01587 1.5611E-004 7.7219E-008 -1.3312E-009 -4.5789E-14 7.8245E-16

[0103] When THI(13) and THI(23) are equal to different values, the corresponding imaging distances are shown in Table 9, corresponding to infinity (focal length 15 mm) and 200 mm (0.07 times), respectively.

[0104] Table 9

[0105] focal length 15.0mm 0.07 times THI(13) 2.205 1.2 THI(24) 17.5 18.4

[0106] The shape of an aspheric surface is defined as:

[0107] r: radial coordinate from the optical axis;

[0108] Z: The offset in the direction of the optical axis starting from the intersection of the aspheric surface and the optical axis;

[0109] c: the curvature of the reference sphere of the aspheric surface;

[0110] k: conic coefficient of the aspheric surface;

[0111] α 2 : Aspheric fourth-order coefficient;

[0112] α 3 : Aspheric sixth-order coefficient;

[0113] α 4 : Aspheric 8th order coefficient;

[0114] α 5 : Aspheric 10th-order coefficient;

[0115] α 6 : Aspheric 12th order coefficient;

[0116] and

[0117] The above conditional summary table is as follows:

[0118]

[0119] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An ultra-wide-angle lens for a mirrorless camera, characterized in that: The invention comprises a first lens group G1 with negative optical power, a second lens group G2 with positive optical power, and a third lens group G3 with positive optical power, which are arranged in sequence from the object side along the optical axis, and the first lens group G1 and the second lens group G2 are fixed when the object moves from infinity to a close distance, and the relationship between the focal length F1 of the first lens group G1 and the focal length F2 of the second lens group G2 satisfies -0.7≤F1 / F2≤-0.4, and the third lens group G3 moves toward the object when the object moves from infinity to a close distance to achieve focusing; The first lens group G1 includes a lens L11, a lens L12, and a lens L13 arranged in sequence from the object side along the optical axis, the second lens group G2 includes a lens L21, a lens L22, and a lens L23 arranged in sequence from the object side along the optical axis, and the third lens group G3 includes a lens L31, a lens L32, a lens L33, a lens L34, a lens L35, and a lens L36 arranged in sequence from the object side along the optical axis; The components with optical refractive power in the ultra-wide-angle lens are only the 12 lenses mentioned above.

2. The ultra-wide-angle lens for a mirrorless camera according to claim 1, characterized in that: The focal length F1 of the first lens group G1 and the focal length F3 of the third lens group G3 satisfy -1≤F1 / F≤-0.75 and 2≤F3 / F≤3, where F is the focal length of the entire optical system at infinity.

3. The ultra-wide-angle lens for a mirrorless camera according to claim 1, characterized in that: A relationship between the focal length F1L11 of the lens L11, the focal length F1L12 of the lens L12, and the focal length F1L13 of the lens L13 and the focal length F1 of the first lens group G1 satisfies 2.2≤F1L11 / F1≤3.3, -4.7≤F1L12 / F1≤-3.6, and 1≤F1L13 / F1≤1.

5.

4. The ultra-wide-angle lens for a mirrorless camera according to claim 1, 2 or 3, characterized in that: The lens L11 is a meniscus lens with negative optical focal power convex to the object side, the lens L12 is a meniscus lens with positive optical focal power convex to the object side, the lens L13 is a meniscus lens with negative optical focal power convex to the object side, the lens L21 is a double convex positive optical focal power lens, the lens L22 is a double concave negative optical focal power lens, the lens L23 is a double convex positive optical focal power lens, the lens L31 is a double convex positive optical focal power lens, the lens L32 is a double concave negative optical focal power lens, the lens L33 is a double convex positive optical focal power lens, the lens L34 is a meniscus lens with negative optical focal power bent toward the object side, the lens L35 is a double convex positive optical focal power lens, and the lens L36 is a meniscus aspherical lens with negative optical focal power bent toward the object side.

5. The ultra-wide-angle lens for a mirrorless camera according to claim 1, 2 or 3, characterized in that: The lens has a full picture angle of over 110 degrees.

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