Alright, just got my D80 and I have a couple of old lenses that are non-AI. One, the 85mm, I thought was AI, since I'm a total newb and don't know much. Actually put it on my camera and took a few photos. Luckily, nothing was damaged. Anyway, I've been reading about AI conversions. I have the tools and the ability to do it myself with no problems, but I'm a little confused on what I'm trying to accomplish. The only thing I can see that gets in the way of mounting a non-ai lense on my D80 is the little switch-thingy (I forget what it's called) that's at about the 8 o'clock position if you're facing the body. But, all the sites I see show the aperture ring being filed/ground/milled from around the f-stops down to some point on the side that isn't clear. Does anybody know exactly what part(s) of the ring should be removed?