TK-2 2x Tele Converter für Zenit, Pentax. M42 Schraubbefestigung!
It was available in the M42 lens mount. M42 screw mount. Lens mount: M42. (Adapter not included). Focal length multiplier: 2x. As you can see in the photos - it's in Excellent Working Condition. Front and rear lenses are clean.