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F-number specifications - translation to English
![Diagram of decreasing [[aperture]]s, that is, increasing f-numbers, in one-stop increments; each aperture has half the light-gathering area of the previous one.](https://commons.wikimedia.org/wiki/Special:FilePath/Aperture diagram.svg?width=200 "Diagram of decreasing [[aperture]]s, that is, increasing f-numbers, in one-stop increments; each aperture has half the light-gathering area of the previous one.")
![Yashica-D TLR]] camera front view. This is one of the few cameras that actually says "F-NUMBER" on it.](https://commons.wikimedia.org/wiki/Special:FilePath/Yashica-D front.jpg?width=200 "Yashica-D TLR]] camera front view. This is one of the few cameras that actually says \"F-NUMBER\" on it.")
строительное дело
технические условия на приёмку покрытия пола по показателям (числам) F (характеризующим ровность и горизонтальность пола)
общая лексика
относительная апертура
Definition
Wikipedia
In optics, the f-number of an optical system such as a camera lens is the ratio of the system's focal length to the diameter of the entrance pupil ("clear aperture"). It is also known as the focal ratio, f-ratio, or f-stop, and is very important in photography. It is a dimensionless number that is a quantitative measure of lens speed; increasing the f-number is referred to as stopping down. The f-number is commonly indicated using a lower-case hooked f with the format f/N, where N is the f-number.
The f-number is the reciprocal of the relative aperture (the aperture diameter divided by focal length).
