Definitions for focal ratio

This page provides all possible meanings and translations of the word focal ratio

Princeton's WordNet

  1. focal ratio, f number, stop number, speed(noun)

    the ratio of the focal length to the diameter of a (camera) lens system

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"focal ratio." Definitions.net. STANDS4 LLC, 2014. Web. 30 Aug. 2014. <http://www.definitions.net/definition/focal ratio>.

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