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This aperture diagram shows the relationship between the f-stops, designated by numbers 2, 2.8, 4, etc., and the size of the corresponding aperture. In any sequence of f-stops, you are either doubling or halving the amount of light with each selection. If you keep in mind that the numbers represent fractions, it's easier to understand how an aperture setting of f2 or 1/2 allows in more light than f16 or 1/16. For the proper exposure of a scene you need the correct combination of shutter speed, ISO film speed and aperture.

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