Long-focus multipurpose photographic lens

Abstract

The invention provides a long-focus multipurpose photographic lens. The lens comprises a main lens barrel, a telescopic barrel and a camera adapter which are connected in turn, wherein a main object lens group is arranged in the main lens barrel close to an observed object end and comprises a first object lens, a second object lens and a third object lens which are arranged along the light propagation direction; the first object lens and the second object lens are combined into a cemented object lens; a correction lens group is arranged in the telescopic barrel far away from the observed object end and comprises a first correction lens and a second correction lens which are arranged along the light propagation direction; and at least one of the lenses is an extra-low dispersion (ED) glass lens. The lens is realized in a novel four-group five-piece mode, and the optical quality of the lens is superior to that of a bird-watching telescope of the same specification and the long-focus lens of a single lens reflex camera; and the lens can be used as the long-focus lens of various single lens reflex cameras for photographing, can be used for the bird-watching telescope, a target-watching telescope, a telescope and the like for watching landscapes and birds, and can realize a full frame function to have multiple functions.

Description

【Technical field】 [0001] The invention relates to an optical lens, in particular to a multi-purpose telephoto lens suitable for cameras, bird observation telescopes and the like. 【Background technique】 [0002] The lens can be divided into wide-angle lens, standard lens and telephoto lens according to its focal length. [0003] The so-called telephoto digital camera is a digital camera with a telephoto lens, and the larger the optical zoom factor, the farther the scene can be shot. The main feature of a telephoto digital camera is actually similar to the principle of a telescope. The focal length is changed by the movement of the lens inside the lens. When we shoot distant scenes or the subject does not want to be disturbed, the benefits of telephoto come into play. In addition, the longer the focal length, the shallower the depth of field, which is the same as the larger the aperture, the shallower the depth of field. The advantage of a shallow depth of field is to highli...

AI Technical Summary

Problems solved by technology

[0006] At present, there are only telephoto lenses for cameras and telephoto lenses for observation on the market, but there is no combination of these two functions in the use of lenses.

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