“guide number”的概念、定义、翻译、参考文献-科学参考

单词	guide number
释义	guide number [`gīd ´nǝm·bǝr] ^{GRAPHIC ARTS} A number that relates the output of a light source (such as a flashbulb) to the sensitivity of a particular film; when the number is divided by the distance in feet to the subject, it gives the T stop at which the lens should be set.
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