It also removes scratches that may be in the glass of your contact printing frame. When I first started contact printing my 4x5 negaitves, I was using the ceiling light in my small 1/2 bathroom as my light source and used the diffusion screens I described above to control the amount of light. But then I switched to a 7 watt light source about 3 feet above the toilet seat top and eliminated the diffusion screens ... and started getting scratches in all my prints... surprisingly all in the same place, yet I couldn't find any scratches on the negatives. Thats when it dawned on me that the diffusion screen layers on top of the frame were eliminating the scratches in the glass.
True. I had an old contact frame with scratches and pits that caused similar problems. A diffusion screen directly over the frame would send light under the scratches and minimize or eliminate them. Instead, I just had a new piece of regular glass cut, it was something like $3 bucks. As long as your springs are strong you shouldn't have problems with regular glass, but I have heard of some persons in humid areas where newton rings are more prevalent using a lightly frosted glass that still lets them see the neg. I wonder if that awful no glare framing glass would do the same thing? I would have trouble with a diffusion over the frame, as then I couldn't see to dodge and burn.
Last edited by JBrunner; 10-15-2007 at 10:29 PM. Click to view previous post history.