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F-stop
Last modified: Thursday, February 01, 2007 

In digital photography and digital video recording, F-stop refers to the international standard sequence of numbers that express relative aperture. F-stop is the "lens focal length" divided by the "effective aperture diameter." The smaller the F- number, the greater the amount of light that passes through the lens. Each change of F-stop halves or doubles the image brightness as you step up or down.

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Digital Cameras

Digital Photography

Measurement

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Related Terms

aperture

depth of field

device

digital

digital camera

digital photography

digital video

digital zoom

focal length

focus spread

zoom

zoom lens

zoomed video
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