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bn:00032579n
Noun Concept
Categories: Dimensionless numbers, Logarithmic scales of measurement, Articles with short description, Optical quantities, Science of photography
EN
focal ratio  f number  stop number  speed  f-number
EN
The ratio of the focal length to the diameter of a (camera) lens system WordNet 3.0
Definitions
Relations
Sources
EN
The ratio of the focal length to the diameter of a (camera) lens system WordNet 3.0 & Open English WordNet
An f-number is a measure of the light-gathering ability of an optical system such as a camera lens. Wikipedia
The ratio of the lens's focal length to the diameter of the entrance pupil Wikipedia Disambiguation
Ratio of the focal length to the diameter of the entrance pupil Wikidata
The ratio of the focal length of a lens to its diameter; a measure of the light-gathering ability of the lens. Wiktionary
Ratio of the focal length of a lens to its diameter. Wiktionary (translation)
The ratio of the focal length to the diameter of a photographic objective. Wiktionary
Focal ratio. Wiktionary (translation)
IS A
ratio
dimensionless quantity
MEASURES
aperture
WordNet 3.0 & Open English WordNet
EN
focal ratio, f number, stop number, speed
Wikipedia
EN
f-number
Wikidata
EN
f-number
Wiktionary
EN
f-number, speed
Wikipedia Redirections
EN
F-Number, f-stop, f-stops, f/, f/11, f/number, F/stop, F number, F Number, F stop, F stops, focal ratio, Fstop, H-number (photography), H-stop, H-stops, H number (photography), H stop, H stops, half stop, Inverse relative aperture, relative aperture, stop number, T-number (photography), T-stop, T-stop system, T-stops, T number (photography), T stop, T stops, Transmission stop, Tstop, Tstops, working f-number, Ƒ-number
Wikidata Alias
EN
f-ratio, f-stop, focal ratio, relative aperature, ƒ-number, ƒ/

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