• f stop,f/stop

f is short forfocal.

f-stop (pluralf-stops)

1. (photography) Any of thediscretesteps or stopping points foradjusting theaperture of alens, either marked on aring on the lens and adjusted byrotating that ring or marked in the display of adigital camera and adjusted bybuttons ortouch-sensitive controls.
   • 2006,Michael Grecco,Lighting and the Dramatic Portrait, Amphoto Books,→ISBN, page22:

     Before you know whatf-stop you want, you first have to know what it is you are trying to accomplish in the photograph: Do I want to freeze action, or show motion, and consider shutter speed, or, do I need to get a cast of people in focus, or focus selectively, and cater to aperture?

   • 2008 May 23, Ted Kritsonis, “Six of one, half a dozen of the other”, inGlobe and Mail, Canada, retrieved 26 Dec. 2008:

     If you're shooting at anf-stop of 2.8, then the lens will take in a lot more light than it would if thef-stop was at 22.

• f-number

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