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Long-focus video lens with focal length of 85 mm

A 85mm, focal length technology, applied in the field of telephoto video lens, can solve the problem of low imaging definition, achieve the effect of improving imaging definition, correcting chromatic aberration and distortion

Pending Publication Date: 2020-09-22
北创光电科技(邵阳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a telephoto video lens with a focal length of 85mm. The first lens group and the second lens group are provided with cemented lenses, which can correct chromatic aberration and distortion, improve imaging clarity, and solve the problem of clear imaging of existing lenses. low degree problem

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  • Long-focus video lens with focal length of 85 mm
  • Long-focus video lens with focal length of 85 mm
  • Long-focus video lens with focal length of 85 mm

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Embodiment Construction

[0041] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0042] refer to figure 1 , a telephoto video lens with a focal length of 85 mm, which sequentially includes a first lens group G1, an iris stop STO, and a second lens group G2 from the object side to the image side;

[0043] The first lens group G1 has positive refractive power and its position is fixed;

[0044] The second lens group G2 has positive refractive power and its position can move along the optical axis direction;

[0045] The first lens group G1 includes a first positive lens group G11 and a first negative lens group G12, the first positive lens group G11 includes at least one negative positive cemented lens, and the first negative lens group G12 includes at least one positive and negative cemented lens;

[0046] The second lens group G2 includes a second negative lens group G21, and the second negative lens group G21 includes at least one nega...

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Abstract

The invention discloses a long-focus video lens with a focal length of 85 mm. The video lens sequentially comprises a first lens group, an iris diaphragm and a second lens group from an object side toan image side, the first lens group has positive focal power and is fixed in position, the second lens group has positive focal power and can move along the direction of the optical axis; the first lens group comprises a first positive lens group and a first negative lens group. The first positive lens group comprises at least one negative-positive cemented lens; the first negative lens group comprises at least one positive-negative cemented lens, the second lens group comprises a second negative lens group, the second negative lens group comprises at least one negative-positive cemented lens, and the first lens group and the second lens group are both provided with cemented lenses, so that chromatic aberration and distortion can be corrected, and the imaging definition can be improved.

Description

technical field [0001] The invention relates to the field of lens technology, in particular to a telephoto video lens with a focal length of 85mm. Background technique [0002] With the development of the short video field, more and more video lenses are used in the field of short video shooting. This type of equipment requires small size, low distortion, clear full field of view, and the market share is gradually increasing every year. However, the existing lens The clarity is not high. Contents of the invention [0003] The purpose of the present invention is to provide a telephoto video lens with a focal length of 85mm. The first lens group and the second lens group are provided with cemented lenses, which can correct chromatic aberration and distortion, improve imaging clarity, and solve the problem of clear imaging of existing lenses. low-level problem. [0004] For reaching this purpose, the present invention adopts following technical scheme: [0005] A telephoto...

Claims

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Application Information

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IPC IPC(8): G02B13/00
CPCG02B13/00
Inventor 梁嘉勇郑忠亮黄国山肖顺东
Owner 北创光电科技(邵阳)有限公司