As professional photographers, how many of you usually use Autof Focus and for hat reason?

Answer 1

Fhotoace has hit the nail on the head! I bought my first auto focus in the early 90's, it was slow and not so dependable.

Now I have had two cataracts removed, and no longer have the acuity to trust myself to focus manually. Fortunately, AF has improved greatly

Three AF SLRs later, I rely on it almost all the time, very very seldom that I might use zone focus during a dark wedding. The AF hardly ever misses and it's fast, both on my F100 and D80. So I am a huge auto focus fan!

Answer 2

Autofocus faster than Manual Focus,especially,fast actions,animals,speed boat,etc.