AE (Auto Exposure)

A system through which either the shutter speed or the lens aperture (semi-auto) or both (fully auto) are set automatically from the light meter. In high-end 35mm camera systems it is highly sophisticated; aided by a large data bank of different scenes to which the actual scene data is compared for highly improved accuracy, AE is virtually foolproof. Three types are available: Programmed Auto Exposure (P mode), where the camera sets both aperture and shutter speed; Aperture Priority AE, (A mode) when the user sets the aperture and the camera finds the most appropriate shutter speed; Shutter Priority AE (S mode), when the speed of the shutter is set by the user and the aperture by the camera.

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