| 单词 | f-number |
| 释义 | f-numberor f number[ ef-nuhm-ber ] / ˈɛfˌnʌm bər / 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. Abbreviations:f/, f/, f, f: Also called f value, focal ratio, speed, stop number . Compare relative aperture. Origin of f-numberFirst recorded in 1890–95 Words nearby f-numberFMN, fMRI, FMS, fn, FNMA, f-number, Fo, foal, foam, foam at the mouth, foam cell Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for f-numberf-number f numbernounphotog 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 apertureSee also T-number Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 |
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