So for example if you are at an aperture value of f16 and want to open the aperture by 4 It's the same with the f1.4 two stops smaller is f2.8 (double the number), two stops smaller is So you can see how the sequence works.Įach step in the progression is 1 F stop, either bigger moving to the left or smaller moving to So begin with F1.0, two stops smaller is F2.0 (double the number), two more stops is F4 (double You only need to remember the F1.0 and F1.4 values. This gives a geometric scale of f1.0 f1.4 f2.0 f2.8 The F stops (full increment not 1/2 or 1/3 rd) are based upon a geometric incremented pattern based upon the powers of the square root of 2 If you are new to cameras (digital or film) and find the F stop notation difficult to understand, or remember, then this little explanation might help.
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