I've found f/54 and f/64 kind of problematic - you can get those on the 85/f2.8 PC if you stop down all the way (f/45) and then focus in closely. But I think we can agree that f/64 on current cameras is kind of extreme. And on that particular lens, I can probably work around the need for f/45+ anyway, precisely because it's that (tilt) lens.
_____ Brian... a bicoastal Nikonian and Team Member
My gallery is online. Comments and critique welcomed any time!