Very interesting Alan, and a lot of painstaking work involved. Once you settle down with a combination of equipment and processing technique that trots them out the way you want them you'll be cool with that. I was fortunate insofar as my negatives and slides are flat enough that DoF can handle them; but since we published the article, I hit upon using museum glass to definitely assure sufficient flatness. It does not distort, it's crystal clear (if kept clean) and I'm seeing no Newton's rings with it. But my set-up is vertical, with the media lying on a light table, so that helps. All that said, I've been doing a lot of testing work lately and I'm finding those old Minolta (5400) and Nikon (Super Coolscan 5000ED) scanners are really hard to beat for overall resolution of fine detail. From the two camera solutions I've seen first hand to date, they are no more than "as good as", usinf fine equipment, but that's saying a lot, and there is considerable saving of time. What's more, there's always scope for incrementally upgrading it as newer lenses and sensors hit the market, whereas once you leave the world of $400-$2000 scanners, you're into $15,000 - $20,000 scanners - no joy there!