Digitizing 35mm negatives using a macro lens

For negative or slide copying one can place the colourhead on the base plate put in the negative/slide and use it as tunable light source with the copy camera mounted at the enlarger collumn. (Kasiser even have a specific plate to put theirt head on upside down.

And here are other approaches using an elarger to copy negatives:
http://www.directupload.net/file/d/3623/y8wdmt4e_pdf