I bought an old Novoflex bellows and I'm trying to find the right adapter for it.
Can somebody identify this mount? The opposite end is a 39mm Leica screw mount.
The collar rotates ~40° or so (almost a quarter turn). It appears to be a locking mechanism. At first I thought it was the old Canon FD mount. It's similar, but slightly smaller in diameter, and with smaller lobes. I only know this because I bought an FD→EOS(EF/EF-S) adapter, and it didn't fit.
Here's the other end and some adapters that came with it (marked MINA & IXA):