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measuring Aperture

19 Sep 2008 on learning

Modern lenses use a standard f-stop scale, which is an approximate of the powers of square-root 2:

f/1, f/1.4, f/2, f/2.8, f/4, f/5.6, f/8, f/11,f/16, f/22, f/32, f/45, f/64, f/90, f/128, etc. typical one-half-stop f-number scale >  

Typical one-third-stop f-number scale