How many degrees does the viewing angle exceed?

The critical point of camera lens distortion is not directly related to the viewing angle, but to the focal length. Generally, 85 mm distortion is gone.

Lens distortion can be divided into pillow distortion, barrel distortion and linear distortion.

Buffer distortion is the phenomenon that the lens causes the picture to shrink to the middle. Generally, pincushion distortion is most easily detected when telephoto lens or telephoto end of zoom lens is used. A good 85mm lens has no distortion, and a poorly controlled 50 mm lens has distortion.

Barrel distortion is a barrel distortion phenomenon caused by the physical properties of lens and the structure of lens group. Generally, barrel distortion is most easily detected when a wide-angle lens or a wide-angle end of a zoom lens is used. Some people have tested that the proportion of 50mm is very small, 35mm begins to feel, 28mm is obvious, 24mm is serious, and 20 mm is very serious. Some people say that the distortion of 85mm tends to zero.

Linear distortion. When trying to shoot tall linear structures at close range, it will lead to pyramid-like distortion. When the wide-angle lens shoots when the axis is not horizontal, it is easy to knock down buildings or trees. That is, the longer the focal length, the smaller the distortion will be when the close shot is changed to the distant shot.