In the late 1980's I was at a camera repairman's place to have 2 Nikons CLA'ed and I showed him one of my super angulons that had this funny look, and he told me it wouldn't affect the images but he could fix it with some black out paint on the cell edges. He told me it was like my Chevy pickup and his Oldsmobile. The paint didn't stick and it would work just fine with out being fixed. I had him fix it since I was there with the lens. He was right, it didn't work any better or worse after the repair. The 2 F-2's did work better after the repair because the meters were now reliable. Like the Chevy pickup the Schneiders sell at a discount with Schneiderits.