Specifications:
Focal Length - 58 mm.
Maximum aperture - 2.0.
Minimum aperture - 16.
Number of diaphragm blades - 8.
Number of lenses / groups - 6/4.
Minimum Focusing Distance - 0.5 m.
The resolving power of the center / edge - 42/21 lines per mm.
Light Transmission - 0.85.
Operating segment - 45.5 mm.
Mounting tips - threaded M52.
Mounting optics - M42.