- 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
| 单词 | relative aperture |
| 释义 | WordReference Random House Unabridged Dictionary of American English © 2024 rel′ative ap′erture, [Optics.]
Collins Concise English Dictionary © HarperCollins Publishers:: relative aperture n
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