Hello all, I recently picked up a Mamiya 1000s. It my first medium format, and I'm really excited. Anyway one of the two lenses that came with it doesn't function properly. The 80mm 2.8 aperture blades do not move. They are stuck wide open. As I have a working 45mm, and the 80 is so cheap i'd like to try repairing this myself. Does anybody have any good info on lens repair, MF Sekor or otherwise? Figure it's worth a shot to do it myself. Thanks & keep shooting!