Leica Order No. - HEKTO, KUP or CHROM LLC - 116
Production era - 1930-1936, 10,600 lenses
Variants - Nickel plated until 1933, chrome plated 1933-1936, 11 o'clock (early) & 7 o'clock (later) versions
Lens mount - Leica Screw-thread
Number of lenses /groups - 6 /3
F stop range - f/2.5-f/18
Closest focusing distance - 1 m
Smallest object field -
Diaphragm setting /type -
Angle of view diagonal - 45 degrees
Filter type - 21 mm
Accessories - HEPRO HEPIK HEPET (see Forum discussion [1] below + ELCAT)
Materials - Nickel or chrome plated brass
Dimensions (length x diameter) -
Weight - 190 g /6.70 oz
Inscription - Leitz Hektor f=5cm. 1:2,5 - Leitz Hektor 1:2,5 F=5cm (50mm)