Pixco Lens Adapter for Macro Nikon F Mount AI Lens to M42 Screw Mount Camera All M42 Screw Mount camera Made of Brass and aluminum with High Quality. Compatible: All Nikon F Mount Lenses All M42 Screw Mount camera. Completely manual control, manual focus and manual exposure. There is no ROM connection on the ring so diaphragm control of the lens is set manually. Macro shooting only! Equipped with lock & stop pin.