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Originally Posted by latinasojourn
the lens just "gathers" the light, with "fast" lenses (bigger lens openings) have more ability to gather.
it is just physics. the smaller the f/stop the greater the light gathering ability.
and the faster the lens, the heavier, and more expensive.
f/5.6 lets in twice the light as f/8, which lets in twice the light as f/11, etc.
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Not entirely true. the quality of the lens has something to do with it as well... not just the size.