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is it true that A low f-number (N) on a lens usually means it has a BIG lens. This is especially noticeable for Telephoto lenses,
is it true that A low f-number (N) on a lens usually means it has a BIG lens. This is especially noticeable for Telephoto lenses, which have larger focal lengths. [A 800mm lens of f-number 4, will have 100mm aperture radius]
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Physics
Authors: Alan Giambattista
5th Edition
1260570053, 9781260570052
