Your F4 may not have a "split screen" type of focusing screen, but that should only make it a bit difficult to manually focus quickly when you first start doing it. I have used my manual focus 50mm f/1.4 on my F4 with no problems, but I am used to not always having a split for focus. Your actual mileage may differ, but that is a really nice lens, and if I didn't have the f/1.4 already I would be all over it.