focal ratio, f number, stop number, speed(noun)
the ratio of the focal length to the diameter of a (camera) lens system
Synonyms:speeding, amphetamine, fastness, pep pill, speed, hurrying, swiftness, focal ratio, upper, velocity, stop number
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"f number." Synonyms.com. STANDS4 LLC, 2019. Web. 23 Jan. 2019. <https://www.synonyms.com/synonym/f+number>.
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