MD version from the 80s I think.
I removed only the back of the lens and hold it manually in front of a M42 confirm focus adapter (not perfectly in line with the camera and some light was able to enter from the back).
This is not bad for a first 15 minutes of shooting.
I think the lens will be really easy to convert correctly (it is like the 50mm F/1.2 back lens, but not easy like the 58mm F/1.2).
All picture was took at full aperture for now (hint, it is smaller than F/2.
. Minimum focus , middle distance and some at the attempt to reach the infinity.
Gallery : http://www.pbase.com/nadeauf/greatminoltalens
(take a look at the DSC07665, it is impressive at full aperture how the lens can give detail from the side of the image).
Regards,
Frank