I have a similar zoom slide duplicator. I used it with a Pentax and a Nikon. It is quite handy if you want to crop part of the slide but I remember flatness used to be a bit of a bother.Originally Posted by modafoto
I also pre-flashed the film to lower the contrast.
Unfortunately last time I duped a slide was more than 4-5 years ago so I can't remember too many details on the preflashing. (Have to dig up my notes - if I can remember where I stored them )