I have a nice c.p. goerz berlin 300mm f6.3 lens that is a really good lens, and a Turner Reich triple convertible, size 8x10. Both have threaded front barrels, and the threads are in good shape. the bad news is that the modern threads don't match. My camera repair guy recommends taking a step up ring and lightly tapping it into the threads, i.e. a force fit, and leaving it on forever.

How about this? It seems sacreligous. I have the Lee rubber band thingy that takes 4x4 filters, but it is not my first choice, and no compendium shade.

Herb