Ultra-wide-angle interchangeable prime lens

Abstract

An ultra-wide-angle interchangeable prime lens comprises a first lens group, a second lens group and a third lens group in sequence from an object side to an image side, wherein the first lens group is fixedly disposed, and the second lens group and the third lens group move toward the object side from the image side for floating focusing. The ultra-wide-angle interchangeable prime lens comprisesa glass aspherical lens to improve resolution of the lens up to use requirement of a professional-grade camera with 8K resolution. The ultra-wide-angle interchangeable prime lens improves a peripheralbrightness ratio to more than 35% even at a maximal aperture, allowing light of the whole lens more uniform on a picture, thereby facilitating accurate exposure during film shooting. A lens structureand an optical path are optimized, in particular to enhance symmetry of the rear group of the lens, so that the TV distortion is below 1%, thereby ensuring that the picture is not deformed and distorted from the center to the periphery. Using floating focusing of the rear group of the lens and optimizing a distance between lenses in front and at back of the aperture at the same time make change of field of view within 1%, improving the problem of obvious breath effect of the camera lens.

Description

technical field

[0001] The invention relates to a technology in the field of optical devices, in particular to an ultra-wide-angle interchangeable fixed-focus lens with a horizontal angle of up to 100°. Background technique

[0002] Due to demand, the performance indicators of movie lenses include: 1. Resolution: up to 6K or 8K; 2. No vignetting: The optical design of the camera lens does not consider the needs of video and movie shooting, and often does not have high requirements for vignetting. Therefore, the vignetting is more obvious, which cannot meet the requirements of video and movie shooting; 3. No distortion: because the distortion of the screen size will easily cause the viewer to feel dizzy, the movie lens must not have distortion similar to that of a camera lens; 4 , No breathing effect is obvious: the shooting technique of chasing focus in the movie screen or moving focus between different subjects has high requirements for suppressing the breathing effect. C...

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