I was recently given a 55mm f/2.8 Micro Nikkor by my uncle. I have a PK-3 tube that I "modified" to fit onto my D200/D300. Basicly, in a lathe, I turned down the housing so it no longer hits the lever on the body of the camera. If you look at the PK-13, it indexes off of that lever (the one around the outside of the lens mount). The problem is it does not meter properly. I have to set exposure comp every time I stop down, or go into non-CPU lens data to set it at, say, f/22. If I get a PK-13 tube, will the camera accuratly meter when I stop down with the aperature ring?