What does "auto zoom" mean in mobile phone shooting?

Auto-focus is a function set on the camera, which automatically focuses the subject through electronic and mechanical devices to make the image clear.

The main characteristics of autofocus are high focusing accuracy and convenient operation, especially for focusing on the subject, autofocus has more advantages. In addition, because manual focusing operation can be omitted during shooting, it is also beneficial for the photographer to focus more on the shot picture and concentrate on capturing the instantaneous scene of the subject.

Auto focus can be divided into active auto focus and passive auto focus.

Active autofocus mainly measures the distance of an object by emitting infrared rays or ultrasonic waves, and the autofocus system drives the lens to adjust the image distance according to the obtained distance data, thus completing autofocus;

Passive autofocus is mainly accomplished by receiving the light emitted by the object and by electronic visual inspection or phase difference detection. Auto focus is also called "auto focus" and "AF" (short for "auto focus" in English).

Holographic autofocus is a new autofocus optical system. It uses advanced laser holography technology to detect the edge of the object by laser spot. Even in the dark environment, it can take photos with precise focus, and the effective shooting distance is 4.5 meters.