Definition of F number

1. Noun. The ratio of the focal length to the diameter of a (camera) lens system.

Exact synonyms: Focal Ratio, Speed, Stop Number
Generic synonyms: Ratio



F Number Pictures

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Lexicographical Neighbors of F Number

f-number
f-stop
f-worded
f-wording
f-words
f.
f/k/a
f/stop
f2 fragment
fMLP
fMRI
fMet
fMet-tRNA
f distribution
f number (current term)
f pilus
f protein
f stop
f urcation
fa la
fa shizzle
fa veolus
faaing
faan
faas
fab lab
fab labs
fabaceous

Literary usage of F number

Below you will find example usage of this term as found in modern and/or classical literature:

1. The Electron: Its Isolation and Measurement and the Determination of Some of by Robert Andrews Millikan (1917)
"... APPENDIX f number OF FREE POSITIVE ELECTRONS IN THE NUCLEUS OF AN ATOM BY RUTHERFORD'S METHOD If N represents the number of free positive electrons in ..."

2. Municipal and Private Operation of Public Utilities: Report to the National by National Civic Federation (1907)
"(f) Number of boilers. Three. (g) Total HP 375. (h) Daily capacity. ... (c, f) Number of purifying boxes, four; dimensions, 18 feet \>yM fwst by 3 feet 3 ..."

3. The Town of Hingham in the Late Civil War: With Sketches of Its Soldiers and by Fearing Burr, George Lincoln (1876)
"F— Number of Hingham Enlistments in the Thirty-second Regiment — List of Battles — Number of Killed and Wounded — Sketch of the Battle of Laurel Hill. ..."

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