What does AEAF mean in the camera?

AE: Automatic exposure means that the camera automatically determines the exposure according to the light conditions.

Auto focus. There are two ways of autofocus, which can be divided into active and passive according to the control principle. Active autofocus emits infrared rays through the camera, determines the distance of the photographed object according to the reflected light signal, and then automatically adjusts the lens to realize autofocus. Passive focusing is to judge whether it has been focused by analyzing the imaging of the object, which is more accurate.