Telephoto lens

Abstract

The invention discloses a telephoto lens. The telephoto lens sequentially comprises a first lens with positive focal power, a second lens with focal power, a third lens with focal power, a fourth lens with focal power, a fifth lens with focal power and a sixth lens with focal power from the object side to the image side, wherein the object side face of the first lens is a convex face, the object side face of the fifth lens is a concave face, the object side face of the sixth lens is a concave face at a near-axis portion, the image side face of the sixth lens is a convex face at the near-axis portion, and the telephoto lens satisfies formulas as follows, 0.75<TTL / f<1.0 and ImgH / f<0.55, the TTL is an axial distance of the first lens from the object side face to an imaging face, the f is an effective focal length of the telephoto lens, and the ImgH is a half of length of a diagonal line of an effective pixel area of the imaging face. Through the telephoto lens, long focal length characteristics can be guaranteed, the relatively small visual field angle and relatively long focal length are realized, shortening the system length of the telephoto lens is facilitated, and miniaturization of the telephoto lens is realized.

Description

technical field [0001] The invention relates to the technical field of photography, in particular to a small telephoto lens. Background technique [0002] With the performance improvement and size reduction of charge-coupled device (CCD) and complementary metal-oxide semiconductor (CMOS) image sensors, the corresponding imaging lens also needs to meet the requirements of high imaging quality and miniaturization . [0003] At present, people have higher and higher requirements for camera lenses of portable electronic products. Generally, camera lenses meet the requirements of optical performance by increasing the number of lenses. Although more lenses can improve the imaging quality, it is not conducive to the miniaturization of the lens. In addition, in order to obtain images with a wider viewing angle, the wide-angle optical system is currently used, which is not suitable for shooting by zooming in on distant objects, which is not conducive to obtaining clear images. Con...

AI Technical Summary

Problems solved by technology

[0003] At present, people have higher and higher requirements for camera lenses of portable electronic products. Generally, camera lenses meet the requirements of optical performance by increasing the number of lenses. Although more lenses can improve the imaging quality, it is not conducive to the miniaturization of the lens.

In addition, in order to obtain images with a wider viewing angle, a wide-angle optical system is currently used, which is not suitable for shooting by zooming in on distant objects, which is not conducive to obtaining clear images

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