Definition of F number
1. Noun. The ratio of the focal length to the diameter of a (camera) lens system.
F Number Pictures
Click the following link to bring up a new window with an automated collection of images related to the term: F Number Images
Lexicographical Neighbors of F Number
f number (current term)
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. ..."