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Wide-angle large-aperture mirrorless camera and prime lens

A fixed-focus lens and anti-camera technology, applied in optics, optical components, instruments, etc., can solve disadvantages and other problems, and achieve the effects of facilitating design and processing, increasing light transmission, and reducing excessive focus

Active Publication Date: 2021-08-13
JIAXING ZHONGRUN OPTICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The smaller the Fno, the smaller the incoming light of the lens, and the more unfavorable it is to shoot in low-light and low-light environments

Method used

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  • Wide-angle large-aperture mirrorless camera and prime lens
  • Wide-angle large-aperture mirrorless camera and prime lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment one, such as figure 1 As shown, a wide-angle large aperture mirrorless camera, including a fixed-focus lens;

[0027] and an image pickup element configured to receive an image formed by the fixed-focus lens; the image pickup element is a CCD or a CMOS, and the image pickup element can be arranged on the image side IMG of the fixed-focus lens.

[0028] The fixed-focus lens includes:

[0029] The first lens group G1 of positive refractive power, the stop STP and the second lens group G2 of positive refractive power;

[0030] A fixed-focus lens satisfies the following conditions:

[0031] 22mm

[0032] Fno<1.3;

[0033] 1

[0034] Wherein, EFL is the overall focal length of the fixed-focus lens, Fno is the relative aperture of the fixed-focus lens, and BFL is the optical back focus of the lens.

[0035] In this embodiment, the function of the large aperture of the mirrorless camera is realized through the limitation of the above condi...

Embodiment 2

[0041] Embodiment two, such as figure 1 As shown, a wide-angle large aperture mirrorless camera, the difference between this embodiment and the first embodiment lies in the specific structure of the first lens group G1.

[0042] On the basis of the first embodiment, in this embodiment, the first lens group G1 includes a first lens L1 with negative refractive power and a second lens L2 with negative refractive power;

[0043] Both curved surfaces of the first lens L1 face the object plane side, and both curved surfaces of the second lens L2 face the image plane side.

[0044]The first lens L1 and the second lens L2 can form a double-Gaussian structure, and due to the symmetrical optical structure, the first lens L1 and the second lens L2 can control vertical chromatic aberration well.

[0045] The first lens group G1 includes a third lens L3 with positive refractive power and a fourth lens L4 with positive refractive power;

[0046] The curved surfaces on both sides of the th...

Embodiment 3

[0057] Embodiment three, such as figure 1 As shown, a wide-angle large aperture mirrorless camera, including a fixed-focus lens;

[0058] and an image pickup element configured to receive an image formed by the fixed-focus lens; the image pickup element is a CCD or a CMOS, and the image pickup element can be arranged on the image side IMG of the fixed-focus lens.

[0059] The fixed-focus lens includes:

[0060] The first lens group G1 of positive refractive power, the stop STP, and the second lens group G2 of positive refractive power.

[0061] The first lens group G1 includes a first lens L1 with negative power, a second lens L2 with negative power, a third lens L3 with positive power, a fourth lens L4 with positive power, and a fifth lens with positive power. The lens L5 is cemented with the sixth lens L6 of negative refractive power, the second lens L2 is cemented with the third lens L3, and the fifth lens L5 is cemented with the sixth lens L6.

[0062] The second lens g...

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Abstract

The invention discloses a wide-angle large-aperture mirrorless camera and a prime lens, and relates to the technical field of cameras. The wide-angle large-aperture mirrorless camera comprises the prime lens; and an image pickup element configured to receive an image formed by the prime lens. The prime lens sequentially comprises a first lens group with positive focal power, a diaphragm and a second lens group with positive focal power from an object plane side to an image plane side. The prime lens satisfies the following conditional expressions: 22 mm<EFL<30 mm; Fno<1.3; and 1<EFL / BFL<2, wherein the EFL is the overall focal length of the prime lens, the Fno is the relative aperture of the prime lens, and the BFL is the optical back focus of the prime lens. According to the wide-angle large-aperture mirrorless camera, the rear focal length of a proper size is selected, so that the possibility that the rear focal length of the wide-angle large-aperture mirrorless camera is too large is reduced, the possibility that the focal power of the second lens group is too large is further reduced, and design and processing of the second lens group are facilitated.

Description

technical field [0001] The invention relates to the technical field of cameras, in particular to a mirrorless camera with a wide-angle and large aperture and a fixed-focus lens. Background technique [0002] A mirrorless camera is a camera without a mirror, also known as a half-lens camera. As early as the period of film SLR cameras, optical manufacturers such as Canon designed mirrorless devices using half-lens technology. The intention was to eliminate the vibration, delay, and full viewfinder motion caused by the up-and-down movement of traditional SLR mirrors during ultra-high-speed continuous shooting. Unfavorable factors such as too long black time. With the improvement of people's requirements for the convenience of cameras and lenses, the requirements for the weight and volume of lenses are also getting higher and higher, and people are pursuing lighter and smaller lenses and cameras. Therefore, mirrorless cameras will gradually replace SLR cameras, and the demand ...

Claims

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Application Information

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IPC IPC(8): G02B13/00G02B13/06G02B13/18
CPCG02B13/0045G02B13/006G02B13/06G02B13/18
Inventor 诸益炜
Owner JIAXING ZHONGRUN OPTICAL TECH
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