Autofocus: Difference between revisions

An '''autofocus''' (or '''AF''') [[optical]] system uses a [[sensor]], a [[control system]] and a [[Electric motor|motor]] or tunable optical element to [[Focus (optics)|focus]] on an [[wikt:automatic|automatic]]ally or on a manually selected point or area. An [[Rangefinder_camera#Digital_rangefinder|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 [[Passivity (engineering)|active]], [[Passivity (engineering)|passive]] or hybrid variants.