I read the topics every week for a long time...
But I don't write so often...!
Today, I think I have something special to present..
The lens on these pictures is fully fonctional.
The mount is fixed and has probably been manufactured by a specialist.
Distance scale is ok, deph of fiels is ok too.
You can see details as engravings for aperture and red dot for the mount.
It fits exactly the camera.

http://www.ussrphoto.com/UserContent/1072011_Rubin_Special_001.jpg

http://www.ussrphoto.com/UserContent/1072011_Rubin_Special_002.jpg

http://www.ussrphoto.com/UserContent/1072011_Rubin_Special_003.jpg

http://www.ussrphoto.com/UserContent/1072011_Rubin_Special_005.jpg

http://www.ussrphoto.com/UserContent/1072011_Rubin_Special_006.jpg

http://www.ussrphoto.com/UserContent/1072011_Rubin_Special_007.jpg

http://www.ussrphoto.com/UserContent/1072011_Rubin_Special_009.jpg

http://www.ussrphoto.com/UserContent/1072011_Rubin_Special_010.jpg

http://www.ussrphoto.com/UserContent/1072011_Rubin_Special_011.jpg

http://www.ussrphoto.com/UserContent/1072011_Rubin_Special_012.jpg
Enjoy!!!!!
Fred