The 1000 Spiegelobjektiv (mirror lens) was manufactured always in a Pentacon Six mount with appropriate35mm mount adaptor included ( M42, Exakta, & Praktina ).
This is one of the mythical lenses made by Carl Zeiss Jena with a fantastic finishing. Mechanical and optical a masterpiece.
Tested the Spiegelobjektiv with a Sony Alpha 7S and it's an excellent lens. Also for astrophotography
More information on the Anamorfose website