KMZ TAIR-11A Objektiv 135 mm f/2,8, UdSSR für Zenit, Pentax. M42 Halterung!
M42 mount. Lens mount: M42. Focal length: 135mm. (Adapter not included). One of my favorite lenses! It has 20 blades diaphragm! Filter mount: M55x0.75. Scale of diaphragms: from 2.8 to 22.