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F.A.M.
f.a.s.
f.b.y.
f.c.l.
F clef
F distribution
f.i.w.
F layer
f-number
F/O.
f.o.b.
F.R.G.
F.R.S.
F region
f-stop
f-word
F.Y.R.O.M.
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f-number
f-num·ber (plural f-num·bers)


noun 
Definition:
 
camera lens setting: the ratio of the focal length to the effective diameter of a camera lens.
Symbol  f
[Abbreviation of focal]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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