Look on Ebay for a Bowens Illumitran, Beseler or Durst slide copier. These copiers are high quality, most models include a bellows which couples to the camera with a "T" adapter, and a light source. Some even include a macro lens, but if not, buy an enlarger lens. These copiers will give you excellent results, better than the Nikon bellows and copier attachment because of the light source, and they are so easy to use. Five years ago they sold new for over 1K, now they go for much less than $100.