HyperDicEnglishFOC ... focal ratio

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Related WikiPedia: focal ratio
English 1 sense of the expression focal ratio:
NOUNrelationfocal ratio, f number, stop number, speedthe ratio of the focal length to the diameter of a (camera / camera) lens system
Englishfocal ratio: 1 sense noun 1, relation
MeaningThe ratio of the focal length to the diameter of a (camera / camera) lens system.
Synonymsf number, stop number, speed
BroaderratioThe relative magnitudes of two quantities (usually expressed as a quotient)
Spanishnúmero de foco, razón focal, velocidad

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