Wide-angle lens

Abstract

The invention discloses a wide-angle lens with a larger hole diameter and a 80 degrees wide vision angle; the wide-angle lens comprises the following elements from the object to the image: a first lens, a second lens, a third lens and a balsaming lens, wherein, the first lens is a negative lens with high refractive index, the first surface of the first lens located at the side of the object is a convexity facing to the object, and the first surface also adopts a non-spherical design; the second lens is a crescent positive lens which is arranged behind an iris(not shown in the figure) and faces to the object, the crescent positive lens is provided with at least one non-spherical face; the third lens is also a crescent positive lens which is provided with at least one non-spherical face; the balsaming lens is made by gluing a fourth lens and a fifth lens and is of plus power. The wide-angle lens satisfies a particular condition, so the whole length of the lens can be more effectively shortened and the product is compacter.

Description

【Technical field】 [0001] The invention relates to a lens, in particular to a wide-angle lens suitable for digital image products. 【Background technique】 [0002] Lenses used in digital imaging products (such as video cameras, digital cameras, etc.) can be divided into three categories: standard lenses, short-focus (wide-angle) lenses, and telephoto (telephoto) lenses according to their focal length or field of view. Generally, a wide-angle lens refers to a short-focus lens. Generally, the longer the focal length, the smaller the angle of view and the smaller the shooting range; the shorter the focal length, the larger the angle of view and the larger the shooting range. Using a wide-angle lens can expand the shooting field of view, and take pictures of panoramas or large scenes within a limited distance range. For example, the use of a wide-angle lens in a video camera is also for the purpose of being able to capture all the clients performing network video communication in...

AI Technical Summary

Problems solved by technology

The reason why the spherical surface is used is because it is easier to process, but the spherical surface is not the most suitable lens shape for optical imaging, it will produce many aberrations, resulting in blurred and out-of-focus images

In order to overcome the above-mentioned aberrations, the lens designer must use a lot of lenses in the lens to compensate, resulting in the improvement of the image quality while the lens becomes large and heavy

Images