Every wonder what “half a stop” means in relation to the maximum aperture of a lens? Me, too! So here’s a handy-dandy list of f-stops in a simple table for your reference.
Without further ado, here is the list of f-stops, from f/1 up to f/22, include fractional f-stops. There are f-numbers higher than f/22, but these mostly don’t apply to general photography.
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You can calculate the actual diameter of the aperture in any given scenario by dividing the focal length of a lens by the f-stop number. For example, a lens with a 85mm focal length stopped down to f/10 has an aperture diameter of 8.5mm. So then, if you double the f-stop, it cuts in half the aperture diameter, which in turn halves the amount of light entering the camera.