| 单词 | relative aperture |
| 释义 | relative aperturenoun Optics.the ratio of the diameter of a lens, especially a camera lens, to the focal length; the reciprocal of the f number or focal ratio of the lens. Also called aperture ratio . Origin of relative apertureFirst recorded in 1885–90 Words nearby relative aperturerelations, relationship, relationship marketing, relative, relative accommodation, relative aperture, relative atomic mass, relative bearing, relative clause, relative complement, relative density Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for relative aperturerelative aperture nounphotog the ratio of the equivalent focal length of a lens to the effective aperture of the lens; written as f/n, f:n, or fn, where n is the numerical value of this ratio and is equivalent to the f-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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