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f-number

   Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson 0.03 sec.

f-number

See f-stop.

f-number, f number
Photog the numerical value of the relative aperture. If the relative aperture is f8, 8 is the f-number and indicates that the focal length of the lens is 8 times the size of the lens aperture


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