I found a Bronica PG 100/3.5 lens (GS-1) in the junk bin today and grabbed it. There was some bad clouding but once I got it home I took it apart and was able to clean it up pretty well, getting rid of the worst clouding quite easily. But then I discovered another problem. There is a group of two elements near the rear that are glued together and the glue seems to have degraded, causing some rainbow like concentric lines that cover about 25% of the element. I initially probably thought they were just reflections because I didn't notice them at the store but now I see that they are readily visible shining a flashlight through the lens. When the lens is mounted I can't see them through the viewfinder though. Do you think they will affect IQ?