AF

I remember when the first autofocus cameras came out, it was a topic of some ridicule and professional snobbery in the early days. Some of the real early systems were based on IR or sound which could be fooled by rain or anything moving in the field of view. All of the early autofocus systems were slow. Push the button, then watch as the focus system started hunting around, eventually settling on something that seemed about right. In the late 70s and 80s came the lenses with in-lens focusing motors so big they left an obvious lump in the lens contour. We called those “goiter” lenses.