Back in the day Tiffen made a bazillion different Series adapters to fit particular odd lenses and to adapt between Series sizes. For example, I know the Tiffen #603 allows use of Series 6 filters on the Canon 50mm f/1.8 and f/1.9 LTM lenses - that's what it says on the box! I'd love to have a list or catalog of these things so I know what I'm looking at on the dollar table at camera shows. Does such a catalog exist?