Minolta Autopole polarizer for Bay 1This unusual (but very handy!) filter makes it easy to use a polarizer on many TLR cameras by coupling a pair of polarizers on the viewing and taking lenses with an easy to turn dial. It's a bit bulky, but works very well. It fits on an Autocord, of course, and we've tested it on a Rolleiflex 3. 5 with good results; ultimately, it should fit nearly any TLR with a Bay 1 filter fitting, but we can't make any guarantees for those we haven't tested. In