device that adjusts the focus of a camera automatically
An autofocus (or AF) optical system uses a sensor, a control system and a motor or tunable optical element to focus ally or on a manually selected point or area. An electronic rangefinder has a display instead of the motor; the adjustment of the optical system has to be done manually until indication. Autofocus methods are distinguished by their type as being either active, passive or hybrid variants.
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1. an optical device for focussing a camer or other instrument automatically
(hypernym) optical device
The camera lens focuses automatically, usually when the shutter release is half-pressed.
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