The question arises: what is the reason of producing the same models under different designations? Perhaps, Carl Zeiss decided to keep up with his competitors that way. Dienstglas model was a complete analogue of the already popular Carl Zeiss D.F.6x model. The first one is the following: the Carl Zeiss D.F.03. However, there are two interesting facts. The device was intended primarily for junior officers (there is an inscription“U.F.” on the right prismatic cover (non-commissioned officer)). The binocular became very popular and, apparently, that was the reason why Carl Zeiss announced the start of the same model production at his factory in March 1911, which was mentioned in a letter to the Bavarian Royal War Office (Munich). In 1908, one of Carl Zeiss main competitors in the military optics market, the German company C.P.Goerz, released another version of 6x24 binocular marked “D.F.03” (the model had been produced since 1903).
In addition, the prisms inside the binocular were no longer pressed by prismatic covers, but they were fixed with special flat springs, which increased the device reliability significantly. Optical characteristics were significantly improved for the new devices (field of view and the lenses diameter were increased, while optical aberrations were reduced), and the devices’ construction was also changed: the central hinge and the “ears” for the neck strap were not attached to the binocular with the help of screws any more - they became the whole part with it instaed, an eccentric lens alignment system appeared and the design of its frame changed, prism covers spanned the binocular body and they were lubricated with a special compound at the joints with the purpose of tightness improvement. In 1906-1907, Carl Zeiss radically changed the construction and the design of his binoculars (both “civilian” and military ones).
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