Full-frame large-aperture wide-angle lens

Abstract

The invention provides a full-frame large-aperture wide-angle lens. The optical system sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an aperture diaphragm, an eighth lens, a ninth lens, a tenth lens, an eleventh lens and protective glass from an object space to an image space. The aperture diaphragm is located between the seventh lens and the eighth lens; the fourth lens and the fifth lens as well as the eighth lens and the ninth lens are glued to form a doublet lens; the optical surfaces of the second lens and the tenth lens are aspheric surfaces, and the optical surfaces of the other lenses are spherical surfaces. The lens is designed for a full-frame large-aperture wide-angle lens, has the advantages of being wide in view field coverage range, sufficient in light incoming amount under a large aperture, adaptive to a full-frame sensor, simple in optical structure, light in weight, small in distortion and the like, and can be applied to the fields of professional wind and light photography and the like.

Description

Technical Field

[0001] This invention relates to a full-frame, large-aperture, wide-angle lens that can be used in professional landscape photography equipment systems to achieve efficient adaptation and high-quality imaging of full-frame mirrorless camera sensors. Background Technology

[0002] With the rapid development of digital photography technology, the market demand for full-frame large-aperture wide-angle lenses continues to rise due to their ability to capture expansive scenes and achieve bokeh effects. However, existing lenses of this type suffer from several problems: as the aperture increases, aberration correction becomes significantly more difficult, leading to noticeable issues such as field curvature, chromatic aberration, and distortion, resulting in a substantial decrease in image quality; at wide angles, it is difficult to ensure uniform illumination at the edges, resulting in problems such as excessively dark images. Furthermore, the complex lens structure results in bulky and heavy lenses, limiting portability, and the multi-element design increases manufacturing costs. Therefore, there is an urgent need to develop a full-frame large-aperture wide-angle lens to meet the market's pressing demand for high-quality imaging, portability, and cost-effectiveness. Summary of the Invention

[0003] The purpose of this invention is to provide a full-frame large-aperture wide-angle lens, aiming to provide a full-frame mirrorless lens with a large aperture, wide field of view, and small size.

[0004] The objective of this invention is achieved as follows:

[0005] A full-frame, large-aperture wide-angle lens, consisting of, from object to image, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an aperture stop, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, and a protective glass.

[0006] Furthermore, the system aperture stop is located between the seventh and eighth lenses, and the fourth and fifth lenses, the eighth and ninth lenses are cemented doublet lenses.

[0007] Furthermore, the optical surfaces of the second and tenth lenses in the system are aspherical, while the optical surfaces of the remaining lenses are spherical.

[0008] Further, the refractive index N1 of the first lens of the system ranges from 1.7 < N1 < 1.8, and the dispersion V1 ranges from 49 < V1 < 50; the refractive index N2 of the second lens ranges from 1.5 < N2 < 1.6, and the dispersion V2 ranges from 56 < V2 < 57; the refractive index N3 of the third lens ranges from 1.7 < N3 < 1.8, and the dispersion V3 ranges from 25 < V3 < 26; the refractive index N4 of the fourth lens ranges from 1.4 < N4 < 1.5, and the dispersion V4 ranges from 70 < V4 < 71; the refractive index N5 of the fifth lens ranges from 1.8 < N5 < 1.9, and the dispersion V5 ranges from 25 < V5 < 26; the refractive index N6 of the sixth lens ranges from 1.7 < N6 < 1.8, and the dispersion V6 ranges from 26 < V6 < 27; the refractive index N7 of the seventh lens ranges from 1.7 < N7 < 1.8, and the dispersion V7 ranges from 50 < V7 < 51; the refractive index N8 of the eighth lens ranges from 1.8 < N8 < 1.9, and the dispersion V8 ranges from 25 < V8 < 26; the refractive index N9 of the ninth lens ranges from 1.8 < N9 < 1.9, and the dispersion V9 ranges from 42 < V9 < 43; the refractive index N 10 ranges from 1.6 < N 10 < 1.7, and the dispersion V 10 ranges from 53 < V 10 < 54; the refractive index N of the eleventh lens 11 ranges from 1.5 < N 11 < 1.6, and the dispersion V 11 ranges from 58 < V 11 < 59.

[0009] Further, the total focal length of the optical system is 18.5 mm, the F number is 2, the total length is 120 mm, the detection wavelength range is 486 nm to 656 nm, the semi-image height is 21.6 mm, and it can meet the imaging requirements on the full-frame imaging chip with which it is paired. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a schematic structural diagram of an embodiment of the full-frame large-aperture wide-angle lens of the present invention.

[0011] Figure 2 is an optical path diagram of an embodiment of the full-frame large-aperture wide-angle lens of the present invention.

[0012] Figure 3 is an MTF (Optical Transfer Function) diagram of an embodiment of the full-frame large-aperture wide-angle lens of the present invention.

[0013] Figure 4 is a field curvature and distortion diagram of an embodiment of the full-frame large-aperture wide-angle lens of the present invention.

[0014] Figure 5This is a relative illumination diagram of an embodiment of the full-frame large-aperture wide-angle lens of the present invention. Detailed Implementation

[0015] The present invention will be further illustrated below with reference to specific embodiments.

[0016] This invention is a full-frame, large-aperture, wide-angle lens, which consists of a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, an aperture stop 8, an eighth lens 9, a ninth lens 10, a tenth lens 11, an eleventh lens 12, a protective glass 13, and a target surface 14, arranged sequentially from the object side to the image side.

[0017] Furthermore, the system aperture stop is located between the seventh and eighth lenses, and the fourth and fifth lenses, the eighth and ninth lenses are cemented doublet lenses.

[0018] Furthermore, the optical surfaces of the second and tenth lenses in the system are aspherical, while the optical surfaces of the remaining lenses are spherical.

[0019] Further, the first lens has a first surface S1 convex to the object side and a second surface S2 concave to the image side; the second lens has a third surface S3 concave to the object side and a fourth surface S4 concave to the image side; the third lens has a fifth surface S5 convex to the object side and a sixth surface S6 concave to the image side; the fourth lens has a seventh surface S7 convex to the object side and an eighth surface S8 concave to the image side; the fifth lens has an eighth surface S8 convex to the object side and a ninth surface S9 concave to the image side; the sixth lens has a tenth surface S10 convex to the object side and an eleventh surface S11 concave to the image side; the seventh lens has a convex surface S10 convex to the object side and an eleventh surface S11 concave to the image side; The eighth lens has a twelfth surface S12 facing the object side and a thirteenth surface S13 convex to the image side; the ninth lens has a fifteenth surface S15 concave to the object side and a sixteenth surface S16 concave to the image side; the tenth lens has an eighteenth surface S18 concave to the object side and a nineteenth surface S19 convex to the image side; the eleventh lens has a twentieth surface S20 convex to the object side and a twenty-first surface S21 convex to the image side; the twenty-second surface S22 and the twenty-third surface S23 are parallel flat glass plates perpendicular to the optical axis.

[0020] Further, the refractive index N1 of the first lens of the system ranges from 1.7 < N1 < 1.8, and the dispersion V1 ranges from 49 < V1 < 50; the refractive index N2 of the second lens ranges from 1.5 < N2 < 1.6, and the dispersion V2 ranges from 56 < V2 < 57; the refractive index N3 of the third lens ranges from 1.7 < N3 < 1.8, and the dispersion V3 ranges from 25 < V3 < 26; the refractive index N4 of the fourth lens ranges from 1.4 < N4 < 1.5, and the dispersion V4 ranges from 70 < V4 < 71; the refractive index N5 of the fifth lens ranges from 1.8 < N5 < 1.9, and the dispersion V5 ranges from 25 < V5 < 26; the refractive index N6 of the sixth lens ranges from 1.7 < N6 < 1.8, and the dispersion V6 ranges from 26 < V6 < 27; the refractive index N7 of the seventh lens ranges from 1.7 < N7 < 1.8, and the dispersion V7 ranges from 50 < V7 < 51; the refractive index N8 of the eighth lens ranges from 1.8 < N8 < 1.9, and the dispersion V8 ranges from 25 < V8 < 26; the refractive index N9 of the ninth lens ranges from 1.8 < N9 < 1.9, and the dispersion V9 ranges from 42 < V9 < 43; the refractive index N 10 ranges from 1.6 < N 10 < 1.7, and the dispersion V 10 ranges from 53 < V 10 < 54; the refractive index N of the eleventh lens 11 ranges from 1.5 < N 11 < 1.6, and the dispersion V 11 ranges from 58 < V 11 < 59.

[0021] Further, the total focal length of the optical system is 18.5 mm, the F number is 2, the total length is 120 mm, and the detection wavelength range is 486 nm to 656 nm.

[0022] Further, the semi-image height of the optical system is 21.6 mm, and it can meet the imaging requirements on the full-frame imaging chip与之搭配的.

[0023] In this embodiment, the parameters of each surface are shown in Table 1 and Table 2 below.

[0024] Table 1: Surface parameters of optical elements surface radius of curvature thickness Refractive index Nd Abbe number Vd S1 49.787 8.478 1.77 49.6 S2 18.082 19.792 S3 -50.874 1.998 1.57 56.0 S4 31.690 4.221 S5 64.297 2.642 1.78 25.7 S6 42572 0.206 S7 458.433 0.999 1.49 70.4 S8 36.490 9.000 1.81 25.4 S9 132.785 0.500 S10 30.703 1.008 1.76 26.6 S11 20.417 1.581 S12 23.081 8.160 1.78 50.3 S13 -48.424 3.649 STO unlimited 0.708 S15 -67.441 0.998 1.81 25.5 S16 15.138 3.952 1.83 42.7 S17 -62.306 5.905 S18 -67.880 0.999 1.69 53.0 S19 -164.309 10.716 S20 34.771 7.599 1.52 58.6 S21 -525.307 7.581 S22 unlimited 1.000 1.52 64.2 S23 unlimited 8.310 IMA unlimited -

[0025] Table 2: Aspherical coefficients K A4 A6 A8 A10 A12 S3 -0.588 3.236E-05 -1.640E-07 4.329E-10 -4.796E-13 0 S4 -0.235 4.531E-05 -2.009E-07 6.450E-10 -7.870E-13 -5.982E-16 S18 -38.907 1.825E-05 -1.636E-06 2.480E-08 -1.712E-10 0 S19 -2.666 5.919E-05 -1.641E-06 2.459E-08 -1.568E-10 4.578E-16

[0026] Note: There seems to be an incomplete expression "与之搭配的" in the translation of line . It might need to be adjusted according to the correct context.The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present invention should be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A full-frame, large-aperture, wide-angle lens. Its characteristics are: From the object side to the image side, it consists of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the aperture stop, the eighth lens, the ninth lens, the tenth lens, the eleventh lens, and the protective glass.

2. The full-frame, large-aperture wide-angle lens according to claim 1, characterized in that, The system aperture stop is located between the seventh and eighth lenses, and the fourth and fifth lenses, as well as the eighth and ninth lenses, are cemented doublet lenses.

3. The full-frame large-aperture wide-angle lens according to claim 1, characterized in that, The optical surfaces of the second and tenth lenses in the system are aspherical, while the optical surfaces of the remaining lenses are spherical.

4. The full-frame large-aperture wide-angle lens according to claim 1, characterized in that, The refractive index N1 of the first lens of the system ranges from 1.7 < N1 < 1.8, and the dispersion V1 ranges from 49 < V1 < 50; the refractive index N2 of the second lens ranges from 1.5 < N2 < 1.6, and the dispersion V2 ranges from 56 < V2 < 57; the refractive index N3 of the third lens ranges from 1.7 < N3 < 1.8, and the dispersion V3 ranges from 25 < V3 < 26; the refractive index N4 of the fourth lens ranges from 1.4 < N4 < 1.5, and the dispersion V4 ranges from 70 < V4 < 71; the refractive index N5 of the fifth lens ranges from 1.8 < N5 < 1.9, and the dispersion V5 ranges from 25 < V5 < 26; the refractive index N6 of the sixth lens ranges from 1.7 < N6 < 1.8, and the dispersion V6 ranges from 26 < V6 < 27; the refractive index N7 of the seventh lens ranges from 1.7 < N7 < 1.8, and the dispersion V7 ranges from 50 < V7 < 51; the refractive index N8 of the eighth lens ranges from 1.8 < N8 < 1.9, and the dispersion V8 ranges from 25 < V8 < 26; the refractive index N9 of the ninth lens ranges from 1.8 < N9 < 1.9, and the dispersion V9 ranges from 42 < V9 < 43; the refractive index N 10 ranges from 1.6 < N 10 < 1.7, and the dispersion V 10 ranges from 53 < V 10 < 54; the refractive index N of the eleventh lens 11 ranges from 1.5 < N 11 < 1.6, and the dispersion V 11 ranges from 58 < V 11 < 59.

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