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Aperture is the opening in the diaphragm of a camera lens. For questions relating to Apple's photo management software, please use [apple-aperture] instead.

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Is f/number more relevant than aperture and/or shutter speed?

I would like to know the aperture size (diameter), but they don't specify it. Knowing that the F/number is the ratio of the focal length on the aperture, why is it so important? … It appears that F/number is less precise than having both aperture and focal length (because it's impossible to know about the aperture and focal length if only F/number is provided). …
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