Encouraged by recent conversations here I tried my old 28-50mm AIS Nikkor on a D300. It worked well in A & M mode, not in P or S mode as expected. When I manually set F8 the data and monitor showed F4. F22 was displayed as F11 and F3.5 was F1.8. The camera exposed properly for what I had manually set. What's goin' on here. BTW, manual focus is not something I would want to return to. I'd post a sample here but, although sharp and well exposed, I mis-focussed most of the time.