The focal length is 135 mm.
The maximum open aperture is 3.5.
Maximum closed - 22.
The number of aperture blades - 12 pcs.
The angle of view is 18 degrees.
Number of lenses / groups - 4/3 pcs.
The minimum focusing distance is 1.2 meters.
The thread for light filters is М52х0.75.
Enlightenment type - single layer