Amazon.com : PENTAX Super Takumar 55mm F1.8 F/1.8 M42 Screw Mount MF Lens (S/N:1626026)#55876 : Electronics
Amazon.com : Fotasy Copper Adjustable M42 Lens to E Mount Adapter, 42mm Screw Mount to E Mount, Compatible with Sony a7 a7R a7s II III IV a9 a7c Alpha 1 a6600 a6500