that's the best way to do it--move up in format size, not down. It is possible to go 1:1 as well, but really the best way is to project the slide/chrome down onto sheet film. Your exposures are generally very short, you'll need to pull the film in development to cut contrast as well. Type 55 polaroid p/n works great for making internegs though. Same goes for the pack film, 665. btw--you'll need to flop the original in the carrier, to get it oriented right on the negative. I used to make alot of internegs this way of 35mm slides ---not the best way to do it, but works good enough.