Fotodiox Pro Lens Mount Adapter - Mamiya RB67/RZ67 Mount Lens to Nikon F Mount SLR Camera Body with Built-In Focusing Helicoid Built-in Focusing Helicoid allows focus with all Mamiya RB67 and RZ67 lenses Premium Grade Fotodiox "Pro" Adapter Infinity Focus Guaranteed Smooth surface for effortless mount 24-Month Manufacturer Warranty