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.
Related photo-factoids
Sensor size is important
This is the physical size of a camera sensor, which is independent of the number of megapixels it has. Bigger sensors capture…
4D AF (Sony)
Sony’s umbrella term for its camera autofocus technologies. It’s saying that it doesn’t just identify and track objects in three-dimensional space but…
Autofocus basics
There are two things to know about autofocus. The autofocus mode is WHEN the camera focuses, e.g. single AF mode to focus…