f-number
(redirected from F stop)Also found in: Encyclopedia.
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.
[f(ocal length) + number.]
f-number
orf 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
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]
Translations
f-number
n (Phot) → Blende f, → Blendenzahl f