the F-stop number is (opening diameter).(focal distance). so f2 would mean the diameter of the opening is half the focal distance of the lens.
it's a square so f4 means a quarter of the light is passing than would pass in f2 etc.
the word aperture literally by definition, means opening or gap to control the amount of light entering a lens.
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Julian
05 STi
Last edited by REXXX; 01-02-2007 at 10:46 PM.
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