# f-number

(redirected from f-numbers)
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## 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.

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

## 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
References in periodicals archive ?
The h-numbers of P are defined as a certain integer transformation of its f-numbers, and knowing the f-numbers of P is equivalent to knowing its h-numbers.
In contrast, Stanley (1991) showed that the only condition that is required on the f-numbers of a simplicial poset of rank d is that [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII]: that is to say that such a simplicial poset must contain a face of dimension d - 1, which in turn contains [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] faces of dimension i; but there are no further restrictions on the f-numbers.
Ride-on trowels aid the contractor by helping them obtain much flatter floors with improved F-numbers (the measure of floor flatness)," he said.

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