[bojan]

Working on adapter (made from M42-EOS insert)..
I tried 3D print, but it proved to be hard to cut the thread (M42x1 or M42x0.75) with reasonable accuracy in plastic, so I decided to go with 1/2 off-the-shelf solution.
I mounted it on my modified 8/500 Rubinar.

Because of reduced distance to sensor, the lens is working at ~ 300mm or so (will check tonight if clouds allow).