Sat Feb 10, 2018 12:03 am
I had the same rotational issue with my Zeiss ZF lenses on a Metabones Speed Booster/MFT Mount, rotational play is MFT was worse than the Nikon. Metsbones straight MFT/Nik Mount is fisrlyntight too, the still some play with the Zeiss lenses. The MFT and Nikon Mount are designed for still camera, and new Nikon G, auto focus lenses, which are manual by wire, no damping. Add a damped lens like the Zeiss ZF lenses, and you need to clamp the lens down.
Yes, BM could have make a locking mount, but it might not be completely compatible with some Nikon lenses, so they went with the Nikon specification, which has some play in it. Manufacturing tollerences on still camera mounts vsries some also. The only real solution to this is the PL mount which is a cam locking system that adjusts for wear.
Cheers
Denny Smith
SHA Productions