Zenit - Krasnogorsky zavod named S.A. Zverev   Helios 44 Start

Specification

Mount bayonet "Start"
Focal length, mm 58
Maximum aperture f/2.0
Minimum focusing distance 50 cm
Diaphragm action push
Angle of View 40°28'
Filter size 49 mm
Construction 6 elements in 4 groups
Dimensions, (Diameter x Length) 60x47 mm
Weight, kg 0.230