Zeiss u boat binoculars serial numbers9/21/2023 The binoculars have a fixed focus, the lenses are treated with anti-glare (this system was developed and patented on 1 November 1935 by Aleksander Smakula, member of the Zeiss staff of Jena since 1934) and the interpupillary distance is adjustable by micrometric adjustment. The binoculars are built completely in solid bronze suitable for the need, in the case of a sudden attack and the binoculars could not be immediately removed from the turret, having to withstand pressures up to 300 meters (30 atmospheres). It was built specifically to be installed in the turret of the submarines (U-Boot) that belonged to the Kriegsmarine (German Navy) and was connected by a graduated circular base to the mechanical control computer placed under the turret exactly in the control room, where once the target was sighted, the detected coordinates were transmitted and consequently the torpedoes were launched. These binoculars are commonly referred to as U.D.F. 7x50, with viewfinder, produced by BLC, code name of the Company Carl Zeiss Jena (on arrangement of Oberkommando der Wehrmacht), in only 500 copies, in about 1943.
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