Adapting the Rodenstock 100/1.6 to the Z system is very simple. I just added a 65-65mm helicoid (17-31mm extension) with a Z mount on the rear end and a 52mm thread in front, since my Rodenstock already had a 52mm thread adapter fitted. Alternatively, I could have used the rear stock threads on the Rodenstock which I believe are 2" (48mm).