I have the Novoflex tripod mount with Arca style base which works on both the Nikon and Leica Novoflex adapters. It works better with the Nikon adapter because you can turn it where the long end of the foot extends toward the lens - with the Leica it will only work one way, which is not a bad thing because most Leica M lenses are fairly light. The longest lens I have used it with is the Nikon 180 2.8 ED AIS. It was okay, but I would hesitate to use it with something longer or heavier. I think Michael pointed out that flange damage to the Sony lens mount was a concern with heavier lenses. There is one problem with the Novoflex mount I don't like. They didn't design the mounting ring far enough away from the mount itself because you can't loosen the ring and turn it to portrait orientation. You have to remove the camera from the ring and then re-position it, easy with the Leicas as it will slide over the lens and adapter, but more difficult with the larger Nikon lenses. All things considered they could have done a better design job.
