Jupiter-37A 135 mm F/3.5, USSR Objektiv für Zenit, Pentax. M42 Halterung. s/n: 8444482
M42 mount. Based on the lens Carl Zeiss Sonnar 3.5/135. It has 12 blades diaphragm! The lens has an M42 mount. Lens mount: M42. Focal length: 135mm. (Adapter not included). Filter mount: M52x0.75.