How to identify the telephoto lens and short-focus lens of SLR cameras?

A lens with a focal length of less than 35MM is a wide-angle lens, a lens with a focal length of 85mm ~ 135mm is a medium-focus lens, and a lens with a focal length of 200MM or more is a telephoto lens.

2, according to the different imaging.

Wide-angle lens has a wider imaging range, telephoto lens has a smaller spatial depth of field and medium focal lens has the smallest deformation.

3. It depends on the angle of view.

Wide-angle lens has a large angle of view, telephoto lens has a small angle of view, medium-focus lens is no different from ordinary lens, and the angle of view is medium.

Extended data

Shooting with a long focal length lens has the following characteristics:

1, small viewing angle

Therefore, the spatial range of the shooting scene is also small, and the shot image is larger than the standard lens at the same shooting distance, which is suitable for shooting the details of distant scenes and shooting inaccessible subjects.

2. Short depth of field

So you can highlight the subject in a messy environment. However, this brings some difficulties to accurate focusing. If the focus is slightly inaccurate when shooting, the subject will be blurred.

3. Poor perspective effect

This kind of lens has obvious characteristics of compressing spatial depth and exaggerating background.