Large-aperture wide-angle zoom lens

Abstract

The invention belongs to the technical field of optical lenses, and particularly relates to a large-aperture wide-angle zoom lens, which comprises a zoom group and a compensating group, wherein the zoom group has positive total optical power, the compensating group has negative total optical power, and zoom is carried out through changing the interval between the zoom group and the compensating group; the compensating group comprises a first lens, a second lens and a third lens arranged sequentially from the object side; the zoom group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens and a tenth lens arranged sequentially from the object side; the fourth lens is a glass aspherical lens; and the focus Ff' of the compensating group and the focus Bf' of the zoom group meet the following condition: 0.8<|Ff' / Bf'|<1.1. In comparison with the prior art, a mixture of a glass spherical lens and a glass aspherical lens is adopted, the aspherical lens has a stronger aberration correction ability, higher performance can be achieved, the reasonably-arranged glass aspherical lens can replace a plurality of glass spherical lenses, the optical structure of the lens can be simplified, the size is reduced, and the assembly efficiency is enhanced.

Description

technical field [0001] The invention belongs to the technical field of optical lenses, in particular to a large-aperture wide-angle zoom lens. Background technique [0002] The large-aperture zoom lens has the advantages of large light transmission and bright picture, especially the large-aperture zoom lens with automatic iris, which can obtain pictures of various magnifications and brightness according to various environments, and has excellent adaptability. Therefore, it is widely favored. [0003] However, large-aperture zoom lenses are usually bulky, expensive, and have poor image quality, usually with a resolution of around 1 megapixel. [0004] With the development of high-definition and miniaturization in the security industry, ordinary large-aperture zoom lenses can no longer meet the demand. Therefore it is necessary to develop a small large-aperture high-definition zoom lens. [0005] However, the research and development of large-aperture zoom lenses is relativ...

AI Technical Summary

Problems solved by technology

[0005] However, the research and development of zoom lenses with large apertures is relatively difficult, and usually requires more spherical lenses to achieve the expected performance

The number of lenses is directly related to the manufacturing cost of the lens, and more lenses will also make the volume of the lens unable to be controlled at a small level

Therefore, if a lens with a spherical lens is used, a good balance cannot be achieved in terms of volume, performance, and cost

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