Focusing - by the rangefinder.
Rangefinder base 39 mm.
Viewfinder magnification x1.15.
Mechanical focal-plane shutter.
Shutter speeds 1000-500-250-125-60-15-8-4-2-1- "B".
Flash sync from "B" to 30 inclusive.
The light meter is absent.
Optics mount threaded M39.
The working distance is 28.8 mm.
Standard lens - Jupiter-8 2/50 Industar-50.