"Realistically I can get 90mm of column elevation, and I measured an exit pupil of 4mm on a 50mm lens stopped all the way down."

And how long of an exposure does that translate into for Azo paper?

Interesting study, but I'll keep using a contact printing frame...though I suppose that using a bank of UV tubes 3" from the neg is not too dis-similar to your #2...which is how I print my platinum prints (and explains why only big chunks of crap sitting right on the neg shows up, but rarely any thing on top of the glass.)

Vaughn