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Definition of: F-number

(ef′num′bər) noun Phot.
A number obtained by dividing the focal length of a lens by its effective diameter: the smaller the F-number, the wider the aperture and the shorter the exposure required: also called F-stop. Also F, F/, F:, f, f/, f·.

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Phrases starting with the letter: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

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