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Definition of f-number noun from the Oxford Advanced Learner's Dictionary

f-number

noun
 
/ˈef nʌmbə(r)/
 
/ˈef nʌmbər/
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  1. a number that shows the relationship between the focal length of a camera lens and its diameter
    Word Originearly 20th cent.: from f (denoting the focal length) and number.
Check pronunciation: f-number

Nearby words

sufficiently
adverb
 
 
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