Transcription
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- US Pronunciation
- US IPA
- UK Pronunciation
- UK IPA
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- [ef nuhm-ber]
- /ɛf ˈnʌm bər/
- /ef ˈnʌm.bə(r)/
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- US Pronunciation
- US IPA
-
- [ef nuhm-ber]
- /ɛf ˈnʌm bər/
Definitions of f-number word
- noun f-number 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. /, f/, f, f: Abbreviation: f. 1
- noun f-number 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 aperture 0
- noun f-number a number that represents the relative aperture of a lens, equal to the focal length divided by the effective diameter of the lens aperture: a higher number indicates a smaller opening 0
Information block about the term
Origin of f-number
First appearance:
before 1890 One of the 20% newest English words
First recorded in 1890-95
Historical Comparancy
Parts of speech for F-number
noun
adjective
verb
adverb
pronoun
preposition
conjunction
determiner
exclamation
f-number popularity
A pretty common term. Usually people know it’s meaning, but prefer to use a more spread out synonym. About 40% of English native speakers know the meaning and use word.
According to our data about 54% of words is more used. This is a rare but used term. It occurs in the pages of specialized literature and in the speech of educated people.
See also
Matching words
- Words starting with f
- Words starting with fn
- Words starting with fnu
- Words starting with fnum
- Words starting with fnumb
- Words starting with fnumbe
- Words starting with fnumber