Today I had the same experience once again: there are reflections shaped like the diaphragm on some of my photos, taken with a Mamiya 330 and a 105mm DS lens, nice backlight landscape shots, ruined by a reflection. I don't need to tell you that you never see these disturbing reflections in the finder, but only on the film. The TLR surprise... Strange enough, I do ALWAYS use a lens hood, and the one I used is exactly the hood for the 105mm lens. As I love back-light shots I would like to solve this problem. Using a compendium is not possible because it is not possible to control the effect on a TLR (surplus, it would cover the finder lens). I guess that somebody else must have similar problems with this lens or others. Avoiding back-light is not an option for me, and I want to keep my Mamiya (Ma Mamiya, you know...) What did you do to solve the problem?