What is the telephoto in photography?

In photography, telephoto refers to a long focal length lens. A long focal length lens refers to a photographic lens whose focal length is longer than that of a standard lens. Telefocal lenses are divided into ordinary telephoto lenses and ultra-telephoto lenses. The focal length of ordinary telephoto lens is close to that of standard lens, while the focal length of ultra telephoto lens is much larger than that of standard lens. Take 135 camera as an example, the photographic lens with a focal length of 85 mm -300 mm is a normal telephoto lens, and the lens with a focal length of more than 300 mm is a super telephoto lens.

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