Normal lens
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In photography and cinematography, a normal lens is a lens that reproduces a field of view that appears "natural" to a human observer. In contrast, depth compression and expansion with shorter or long
Four "normal" lenses for the 35 mm format.
Focal length
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The focal length of an optical system is a measure of how strongly the system converges or diverges light; it has units of length, and for an idealized thin lens is equal to the distance between the l
Normal lens
…a lens that reproduces a field of view that appears "natural" to a human observer. In contrast, depth compression and expansion with shorter or longer focal lengths introduces noticeable, and sometimes disturbing, distortion. Photographic technology employs different physical methods from the human eye in order to…
Sketch of human eye showing rear focal length f′ and EFL
28 mm lens
50 mm lens
70 mm lens