I recently did some copying of Kodachromes onto FP4. I used a Nikon Micro 55mm and PK-13 tube. I used the Nikon ES-10 slide duplicater thingy. After some experimentation I got very good negs with pretty much the whole tonal range of the slide. Technical bits. FP4 rated at 4 (yes that's FOUR) asa. D76 at 1:3 for 10mins @20c. I used a tungsten household spot to illuminate the slide. Metering was not an exact art and centre weighted gave the best results (my camera wouldn't allow for anything else!). Bracket your exposures and use the above times etc as a guide.