Fri 30-Aug-13 04:42 AM | edited Fri 30-Aug-13 04:52 AM by D2xer
Hi Tony - I used to experience exactly what you're describing, with my D2x, when used with one or two AI or AIS lenses in particular. I can't remember which lenses now, but the upshot is that the camera's aperture lever mechanism started playing up and eventually stopped working.
I can't help thinking that this 'impact' (which to me felt like the camera's stop-down mechanism driving the lens's aperture lever too-hard into the lever's end-of-travel stop) had something to do with the failure.
Now that you remind me, I should double-check all my AI/AIS lenses on my 'new' D700 and D300.
If I were you, I'd not use the lenses in question - assuming the camera is OK and doesn't do this with your other lenses. Good luck!