A method of exposure where aperture and shutter speed settings are first read, then set, by the camera's exposure system. Various autoexposure modes allow for customization or biasing the readings.

a facility which automatically adjusts iris and/or shutter-speed to maintain exposure.

Shutter speed and aperture are set automatically by the camera based on its interpretation of the camera's exposure meter readings. Some high-end cameras employ highly-sophisticated, computerized autoexposure systems that seem to be almost foolproof, whereas most consumer cameras' autoexposure systems work best in average lighting situations.