Features: M42 to all Pentax PK mount adapter ring Make M42 mount lenses (Zeiss, Pentax, Praktica, Mamiya, Zenit) can be used on Pentax PK cameras There is no ROM connection on the ring so diaphragm control of the lens is set manually It is possible to use Macro rings and other accessories It is able to perform focus to infinite. Made of metal (not plastic) adapter is 0.5cm thick Specifications: Diameter: 48mm Material: metal Color: silver |