Just about all digital cameras have autofocus systems, and while there’s a wide range of different autofocus (AF) technologies, the basic principles of how autofocus works is the same across all of them and boils down to two things: AF modes and AF points. AF mode: WHEN the camera focuses If you’re taking one picture […]
Digital cameras use an array of AF points (focus points) to cover different areas of the frame, but they don't necessarily cover all of it. The AF coverage is the percentage of the frame width and height that contains focus points. Wider coverage is a selling point.