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Normal lenses are the ones with focal length roughly equal to diagonal of imaging surface (43mm on 35mm full frame, about 28mm on APS-C). Classic normal lenses are slightly longer (50...58mm on FF, 30...35 on APS-C).
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What is a normal lens?
I've heard people call 50mm lenses "normal lenses".
For a lens to be considered normal, does it have to be exactly 50mm or is there some leeway? … Does the normal focal length depend on crop factor of body used with lens? Are there any important relationships with other lens categories, such as wide, telephoto, prime, zoom, standard lenses? …