Helios 44-2
Lens mount: adapter PL / M42
Focal length: 58mm
Relative aperture: 1: 2
Scale of diaphragms: from 2 to 16
Diaphragm: Manual
Focusing range: from 0.5m to 20m to infinity
Filter mount: M49x0.75
Mir-1B
Lens mount: adapter PL / M42
The focal length is 37 mm.
The viewing angle is 60 degrees.
Open diaphragm - 2.8.
Closed aperture - 16.
The number of aperture blades - 10 pcs.
The minimum focusing distance is 0.7 meters.
The number of lenses / groups is 6/5.
Center / edge cutting capacity 45/23 lines per mm.
Threaded optics mount - m42.
Aperture presetting mechanism.