Definition of Focal Ratio in English :
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Focal Ratio meaning in English
Meaning of Focal Ratio in English
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Focal Ratio pronunciation in English
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Focal Ratio
see synonyms of focal ratioNoun
1. f number, focal ratio, speed, stop number
the ratio of the focal length to the diameter of a (camera) lens system
WordNet Lexical Database for English. Princeton University. 2010.
Focal Ratio
see synonyms of focal rationoun
photography another name for f-number
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