f-stop

or f stop

[ ef-stop ]
/ ˈɛfˌstɒp /

noun Photography.

the setting of an adjustable lens aperture, as indicated by an f number.

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British Dictionary definitions for f-stop

f-stop

noun

any of the settings for the f-number of a camera
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012