Test - Jupiter-8 50mm f 2 Focal length 52.3 mm
Aperture 1:2 (settings from 4 to 22)
Focusing 1 m - infinity
Filter size M40.5x0.5 mm
Optical registration (back focus) 28.8± 0.02 mm
Mount M39x1 mm (LTM). The lens mounts and RF couples with any Leica or Leica copy (FED, Zorki etc.)
The glass is coated; the barrel has a polished aluminum/chrome finish