F-number

What is F-number?

F-number definition and meaning on Dictionary terms:
noun Optics, Photography.
a number corresponding to the ratio of the focal length to the diameter of a lens system, especially a camera lens. In f/1.4, 1.4 is the f-number and signifies that the focal length of the lens is 1.4 times as great as the diameter. Abbreviation: f/, f/, f, f:

 

reference: www.dictionary.com/browse/f-number

Tags: