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In photography and cinematography, a wide-angle lens is a lens whose focal length is shorter than the focal
length of a normal lens. For a 35
mm camera with a 24 by 36 mm format, the normal lens is 50 mm. A lens of focal length 35 mm or less is considered wide-angle.
In addition to giving a wider angle of view, the resulting image will also have a certain degree of perspective distortion.
Extreme wide-angle lenses normally do not give a geometric projection, and
are called fisheye lenses.
See angle of view for an example of an image taken by a wide-angle
lens.
See also: film format, normal lens
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