Fotodiox Pro Lens Mount Adapter - Contax 645 (C645) Mount Lenses to Nikon F Mount SLR Camera Body with Built-in Aperture Iris Premium-Grade Fotodiox Pro Adapter; Infinity Focus Allowed Mounts Contax 645 (C645)Mount SLR Lenses to Nikon F Mount SLR Cameras Enhanced craftsmanship and high-tolerance construction for demanding professionals Integrated de-clicked aperture iris for incoming light adjustment 24-Month Manufacturer Warranty