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, f number, stop number
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"f number." Synonyms.net. STANDS4 LLC, 2017. Web. 23 Nov. 2017. <http://www.synonyms.net/synonym/f number>.
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