I invented autofocus, in the '70s. Really, I did. Well, in my head, anyway.
I recall struggling with with the darkening of a split-image or microprism focusing aids, or straining my (then very good) eyes while trying to feel absolutely confident that the split-image is not, or that the microprism is as clear as it can possibly be. I then imagined a world in which electronics would perform this function. The rest, as we all know, is history
Sadly, all is not perfectly good. The state of current AF technology is such that it sometimes misses perfect focus. However, my eyes now are definitely not better than they were 40 years ago, so AF, as imperfect as it may be, is nevertheless a welcome feature.
I do see here at PF that there are many who use manual focusing. I suppose in some cases this is simply due to the use of manual focusing lenses, but I also get the impression that some users
prefer MF. This, I would assume, is due to being able to achieve more perfect focus than what would be reached using AF. So my question is, for people who have not replaced the focusing screen with KatzEye or similar: when using MF, do people rely on the AF indicator, or on what they see in the viewfinder? And if the former, is the indicator actually more precise when used manually than in conjunction with any AF motor?