Handy-Dandy List of f-Stops (in a table)

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.

As you peruse this list of f-stops, consider following this Amazon Affiliate link as a way to support this site. It costs you nothing and it will help me keep articles and reviews coming.

f-stop1/4-stop1/2-stop3/4-stop
11.11.21.3
1.41.51.71.8
22.22.32.6
2.83.13.43.7
44.44.75.2
5.66.26.77.3
88.79.510.4
11121314.6
16171920.7
2224.62729

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.

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