Definition: The number resulting when the focal length of a lens is divided by the diameter of the aperture. A sequence of f-numbers calibrates the aperture in regular steps (know as stops) between the minimum and maximum openings of the lens. The f-numbers generally follow a standard sequence, in such a way that the interval between one full stop and the next represents halving or doubling in the image brightness. Also called f-stop or relative aperture. The f-number becomes progressively higher as the aperture is reduced to allow in less light; i. e. f/5. 6, f/8, f/11, f/16, f/22, f/32. . . Theoretically, all lenses at the same f-number produce images of equal brightness.
Definition: A number that indicates the size of the lens opening on an adjustable camera. The common f-numbers are f/1. 4, f/2, f/2. 8, f/4, f/5. 6, f/8, f/11, f/16, and f/22. The larger the fnumber, the smaller the lens opening. In this series, f/1. 4 is the largest lens opening and f/22 is the smallest. Also called f-stops, they work in conjunction with shutter speeds to indicate exposure settings.
Definition: A number that indicates the size of the lens opening on an adjustable camera. The common f-numbers are f/1. 4, f/2, f/2. 8, f/4, f/5. 6, f/8, f/11, f/16, and f/22. The larger the fnumber, the smaller the lens opening. In this series, f/1. 4 is the largest lens opening and f/22 is the smallest. Also called f-stops, they work in conjunction with shutter speeds to indicate exposure settings.
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