VictorM.
Well-known
There goes my big secret! I have Series 6 adapter rings that fit a Serenar 28/3.5 through a couple of Retinas through a Summicron-C through a number of folders, up to a 6X9 Nettar. A small selection of hoods and filters and I have no excuse for not using what I need to use. Even Leitz Series 6 filters are cheap. Hoya and Kenko Series 6 hoods are both useful and beautiful. And cheap.