I have been going a little mad shooting paper negatives in a large format camera. I found something rather interesting but can't put a handle on it. I know about retroprocity (sp) but I can get a good paper negative at normal exposure down to about a minute, then it goes nuts. I mean really nutso. After a minute I finally cranked the iso down to 1. I usually use five, Still couldnt get enough light on the paper. Then I added stops and i cant get a handle on it. It's making me crazy. I dont think I have made a single decent negatative longer than a minute exposure. Outside it works fine, its just in the studio that I can't make it work. Pin holes at fifteen minutes outside work peachy keen, but in the studio even with a decent lens I get bumpkus. Anybody familier with paper negs from the camera.