... *ist Ds, *istDL2, K100 Introduction: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 ... 27 MD-NIKON1WTY-A-28 OM-NIKON1WTY-A-29 PK-NIKON1WTY-A-30 LM-NIKON1WTY-A-31 PTX/ ... 109 W-TIANYA adapter ring Pentax M42 42mm to PK K Mount Adapter Infinity focus for K20D K100D ...