Pentacon Auto 50mm F1.8 Lens Reviews - Miscellaneous Lenses - Pentax Lens Review Database,Pentacon 50mm F/1.8 auto / electric Multi Coating | LENS-DB.COM,Pentacon 50mm f/1.8 - an imperfect jewel (according to my taste anyway) — Nature photographer & artist Jo Stenersen,EXC Test Photos MC Pentacon Auto 1.8/50mm M42 Screw Mount - Etsy,Pentacon 50mm f1.8 Auto - Lens – Kamerastore