silly noob question...
... and one that i should by rights know the answer to...
200mm lens with a front lens size of 52mm @ f/9
600mm lens with a front lens size of 72mm @ f/9
are they going to offer the same brightness at the same shutter speed or will the greater sixed front lens offer more light gathering ability?
I really should know the answer!
i know how it works for telescopes, but how does it work for camera lenses?
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