Aperture priority

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Aperture priority refers to a setting on automatic cameras that ensures proper exposure by keeping the aperture fixed to a specific diameter and adjusting the shutter speed in changing light levels.

The main purpose of using aperture-priority mode is to control the depth of field. Aperture priority is useful in landscape photography, where a narrow aperture is necessary if objects in foreground, middle distance, and background are all to be rendered crisply, while shutter speed is often immaterial. It also finds use in portrait photography, where a wide aperture is desired to throw the background out of focus and make it less distracting.

Aperture priority is often abbreviated with Av or A on a camera mode dial.

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