Stop number (original) (raw)
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I. (noun)
Sense 1
Meaning:
The ratio of the focal length to the diameter of a (camera) lens system
Synonyms:
f number; focal ratio; speed; stop number
Classified under:
Nouns denoting relations between people or things or ideas
Hypernyms ("stop number" is a kind of...):
ratio (the relative magnitudes of two quantities (usually expressed as a quotient))