M42 Lens to Nikon AF Mount Adapter Ring for DSLR Camera Black M42 to all NIKON AF mount adapter ring Make M42 mount lenses (Zeiss, Pentax, Praktica, Mamiya, Zenit) can be used on NIKON cameras There is no ROM connection on the ring so diaphragm control of the lens is set manually Completely manual control, manual focus and manual exposure Made of Aluminium with High Quality