Interesting, I bought a a7R ll with a view to being able to use my 24mm, 50mm and 75mm Summicron optics it. I bought a Zeiss Sonnar 35mm f2.8 E Mount lens at the same time. I was informed that the 35mm Summicron asph M lens was not compatible with the Sony E camera, to do with the distance from the rear optic to the sensor issue. The adaptor to use with my M lenses will arrive today and I am looking forward to trying it on my a7R ll. A terrific camera body. I assume the settings will need to be set on manual, which isn't an issue as that is my preferred mode of operation anyway and is how I obviously use my Leica M6. If everything works well I will also acquire a Leica screw adaptor so as I can use older Leitz glass and a Nikon adaptor to be able to use a Nikkor 35mm Shift lens. That could be interesting?