I had a 200/4 AI-S. Wonderful lens, so long as you can work with somewhat dimmer finder. I used it with my F3HP that has a P screen (like standard K only with diagonally split prism) and it worked well... except when it didn't, which is when it gets darker outside. Otherwise, sharp and great even wide open but really shines at f/5.6. Great with tubes too. Did anybody say it's cheap? It found a new home when I got a 180; I don't shoot such freakishly long lenses often and 180/2.8ED AI-S is way too good.