Hmm. Could you expand on that?

I'm aware of the 'fEE' error - and this is not that When I attach the 50/1.8 AFD lens (for example), and turn the camera on, the LCD shows 'F--' and the matrix-metering indicator flashes. This is the same behaviour that I get when I attach an AI lens to the camera, so it looks to me as though the camera is not recognising the lens' CPU and treating it just like a manual lens.

Perhaps I need to be more rigourous, and lock the lens' aperture to f22 before mounting the lens..? I can't imagine why that would make a difference, but hey! I'll try anything if it works