I thought the dpp from harmon was 8x10 largest---they SHOULD make it in bigger formats though--it'd work best for the super sized stuff and home made obscuras...of course you can tape together sheet of it and make that work too for larger--
Originally Posted by Randy Moe
or you can shoot regular paper and reversal process it---you get the same speed as dpp..you just need to do the reversal step and 2 development stages
your 35 inches of bellows with a 25" lens should get you .4 magnification max...so that's a view field of slightly smaller (film edges from film holder) than 20x25....that will be at a subject distance of 7'-3 1/2".....should look magnifique when you nail the focus--use strobes to freeze....bellows factor!!! remember the bellows factor--you lose almost exactly one stop at that extension...so f22 is realy f32.....like that...with these big formats, you're always with the bellows factors!