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Old 20-12-2007, 01:18 PM
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ving (David)
~Dust bunny breeder~

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Join Date: Nov 2004
Location: The town of campbells
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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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