I am having a flare problem with my DaYi 6x12 back. More accurately, it would described as a fog problem. But whatever you call it, it's a PITA. When using the back without a mask (i.e. the full 6x12 opening), I get fog clouds on the short edges of the image. For the most part, this fogging only extends about 1/4 in from the edge of the frame, but with brighter subjects and more generous exposures it can creep in quite a bit. There is also fogging in the empty area between the exposures, though it appears to be from the same source/location as the in-frame stuff. Here's a typical example (scanned on a 4990). Please ignore the atrocious color balance. My best guess: when using a wide-angle lens, or with certain movements, light passes through the 6x12 aperture of the back and strikes the stainless steel roller, which reflects light back onto the film and causes the fog cloud at the edge of the image. Has anyone else experienced this, and if so, how did you solve the problem? Anyone have any suggestions? I would really appreciate some help, because right now, I'm just wasting film shooting 6x12 if the image edges are going to be ruined every time. Thanks!