Carl Zeiss Jena Fernglas Binoctem 7x50 binoculars.

The history of the Carl Zeiss Binoctem 7x50 model goes back to 1919. In that year the Carl Zeiss Binoctar 7x50 was launched - optically the same device but with an individual focusing system. The Binoctem model, featuring a bridge and the central focusing, hit the shelves in 1931. In 1937 both 50x models underwent a slimming treatment because the metal used for their casing was changed. As a result, the weight of the Binoctem decreased from 1300 grams to 860 grams (only to rebound later to 1010 grams).