02. What is the meaning of focal length? In other words, what about a 50mm lens is 50mm?
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This article is from the Photographic Lenses FAQ, by David Jacobson with numerous contributions by others.
02. What is the meaning of focal length? In other words, what about a 50mm lens is 50mm?
A 50mm lens produces an image of a distant object on the film that is the same size as would be produced by a pinhole 50mm from the film. See also Q5 below.
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