f-number

(redirected from Fstop)
Also found in: Encyclopedia.
Related to Fstop: Shutter speed

f-num·ber

(ĕf′nŭm′bər)
n.
The ratio of the focal length of a lens or lens system to the effective diameter of its aperture. Also called f-stop.

American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

f-number

or

f number

n
(Photography) photog the numerical value of the relative aperture. If the relative aperture is f8, 8 is the f-number and indicates that the focal length of the lens is 8 times the size of the lens aperture. See also T-number
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

f-number

(ˈɛfˌnʌm bər)

n.
a number corresponding to the ratio of the focal length to the diameter of a lens system, esp. a camera lens. Symbol: f/
[1890–95]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
Translations

f-number

n (Phot) → Blende f, → Blendenzahl f
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007
References in periodicals archive ?
Getting the shot is all about being ready and the zippered back panel of my Fstop Kashmir backpack lets me access my camera quickly.
diner, owner and location manager at Fstop Locations; and Ali Azarmi, managing partner at Joy Films.
To wit, Blount's entry on e-mail reads, "Call this hyphen fussy if you will, but you wouldn't write Abomb for A-bomb, or opositive for O-positive, or Xray (which looks like the name of a science fiction villain) or fstop or Bgirl or Bside of a record (not that there is any such thing anymore) or Csection, Fword, Gman, Vchip, or Xfactor." On the abbreviation mic, Blount writes, "We need to preserve as much phonetic fiber in English as we can.