Wide-angle telephoto imaging optical system

Abstract

A wide-angle telephoto imaging optical system is composed of a front lens group with negative refractive power and a rear lens group with positive refractive power, which are sequentially arranged from the object side to the image side; wherein the front lens group is composed of a negative first lens group. The lens, the second negative lens and the positive third lens; the rear lens group is composed of a positive fourth lens, a negative fifth lens, a positive sixth lens and a negative seventh lens, and the diaphragm is located in the front lens group and between the rear lens groups. An imaging system that satisfies the conditional expression of the present application can obtain a larger focal length while satisfying a larger angle of view.

Description

technical field [0001] The invention relates to an imaging optical system, in particular to a wide-angle imaging optical system with a larger focal length. Background technique [0002] The existing optical imaging system has deficiencies in the field of view and focal length, such as the wide-angle single focus lens disclosed in CN102621667A, the field of view is 71°, the effective focal length is only 5.8mm, the field of view is not large enough, and the focal length is also short; In CN206411328U, although the field of view is increased to 95°, the focal length is only 3.61mm. When used in monitoring, although it can shoot images with a larger viewing angle, it cannot focus on slightly distant objects and cannot obtain clear images. Many applications are limited. Although a zoom lens can be used, its cost increases significantly, and the angle of view of the zoom lens is greatly reduced when it becomes a telephoto lens. SUMMARY OF THE INVENTION [0003] In view of the...

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Problems solved by technology

[0002] Existing optical imaging systems have deficiencies in field of view and focal length. For example, the wide-angle single-focus lens disclosed in CN102621667A has a field of view of 71° and an effective focal length of only 5.8 mm. The field of view is not large enough and the focal length is relatively short; In CN206411328U, although the field of view is increased to 95°, the focal length is only 3.61mm. When applied to monitoring, although a larger viewing angle image can be taken, it cannot be focused on a slightly distant object and cannot obtain a clear image. Therefore, in In many cases, the application is limited

Although a zoom lens can be used, its cost will increase significantly, and the field of view will be greatly reduced when the zoom lens is changed to a telephoto lens

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