Binoculars 12x60 BLC, Carl Zeiss Jena, Afrika DAK, circa 1940

            Binoculars 12x60 “BLC” , encrypted name of the manufacturer Carl Zeiss Jena (at the disposal of the Oberkommando der Wehrmacht), with 60° inclined eyepieces and installed on stereoscopic R40 rangefinders (equipped with 3 identical binoculars).
This is the number "2" and is therefore identified as the second of the series of 3. Used for the first aerial sighting, they were also mounted on other models of rangefinders and pointing devices and are found with variations in color (grey-blue or dak).

Every 12x60 binoculars inclined at 60° had optics treated for anti-reflection (this system was developed and patented on 1 November 1935 by Aleksander Smakula, member of the Zeiss staff in Jena since 1934). These binoculars have some unusual and interesting features: the interpupillary distance is adjusted by moving a lever under the left eyepiece assembly (same as the 25x100 Zeiss) which eccentrically rotates the assembly itself. Prisms have a system of two light-reflecting surfaces to have a brighter image.
You can select two filters (one light gray and one dark) by turning a small knob with "farbgläser" written on it.

There is a rubber mask (which can be raised, lowered and folded) to facilitate and improve view while also being more comfortable and more stabilized, having the forehead supported. A large knob on the front/top operates and tightens a clamp on the bottom for attachment to the rangefinder.

The sun filter can be disengaged by rotating the lever located on the upper front part. The Bakelite eyepiece cover is attached to the binoculars via a rope strap with button.
   

Taken on: October 31, 2023

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