Ok, is it bellows, or light leaks? It's killing me. I have ruined 'dozens' of images with leaky corners.....It's a Phillips 7 x 17 and S & S holders...In the corners where the flaps are for my S & S holders, I am getting leaks...it's like a dark fan, about size of a quarter. It's consistent with most of my holders, except in the shade....no flare. I have tried g claron lens, dagor, artar - with lens shades, of course. .....I get the leak/flare. So, I put a flashlight in the camera, put a lens on with lens cover, inserted holder, and NO light visible in the dark, Notta, nothing. Exposures, from 15th to a second...doesn't matter. Bellows close or extended. I have had the 'issues'... Any one else have problems with S & S holders? I don't think it's the camera as I did not see any light when I did the test in the dark. I tried black paint in the flap, but not sure if I did it right - i.e do you need to paint the inside slot that accepts the holder. Do I need to add some tape on the flap end for extra measure? Like around the seams?