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Aperture

09 May 2008 on learning

Aperture is the opening through which light is admitted into the camera and in photography it refers to the diameter of the aperture.

Some links on aperture:

Measurement of aperture is in f-number = the ratio of the focal length to the aperture diameter.

picture credit

Calculation of f-number: where f is the focal length, and D is the diameter of the entrance pupil