Fotodiox Pro Lens Mount Adapter with Focusing Barrel, Mamiya RB67 Lens to Nikon Camera such as D7200 & D5000 Premium Grade Fotodiox Pro Adapter Built-in Focusing Helicoid allows focus with Any Mamiya RB67 Lens, Super Smooth and Precise Focusing Barrel Infinity Focus Allowed Anodized Aluminum Construction; Smooth surface for effortless mount 24 Month Manufacture Warranty