This sale is for a converter ring to allow fitting of Mamiya RB67 Pro/ProS lenses to the later ProSD (or RZ67) cameras. It is in mint condition.
This ring fits onto the back of your RB67 or RB67 C lens to make the correct fit with the later RB67 Pro SD or even RZ67 camera bodies. These have a larger lens throat and this adapter ring brings your lens up to the correct size. Dead easy to fit – you just push it on with the thicker end to the outside (easier to get off again if you need to!). This example has absolutely minimal signs of use.