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– Until very recently, basically the same binocular without the yellow tint could still be purchased from Docter /Noblex (see separate post about Docter 7×40 B/GA, ×40-b-ga/), but according to news reports, Noblex is closing its binocular production in October 2020. Carl Zeiss Jena: Model: Notarem DF 10x40 B: Lens diameter mm 40: Magnification x 10: Angular field of view deg 6: Linear field of view m/m 105/1000: Exit pupil mm 4: Eye relief mm 0: Min. On the left cover is engraved: Carl Zeiss Jena D.R.P. These bino's were numbered with a military number ( No), or a private number ( P No) for private sale to the officers. A positive side-effect of the yellow tint: thanks to the higher absorption in the short wave part of the spectrum, contrast is slightly enhanced in misty or foggy weather. The DF 6x is probably the first model with the 40 degree oculars. This is achieved by adding ceroxides to the glass the EDF was tested with a dose of about 10’000 Röntgen/hour for a period of 10 hours (40 times the lethal dose for humans) and had to keep at least 50% of its transmission. I own a couple of pairs of multi-coated Carl Zeiss Jena binoculars (Jenoptem 8x30 and 10x50) and have been wondering how they would compare to current high end binoculars, like the roofs from Leica, Swarovski and Zeiss, or high-end porros from the likes of Nikon, Swift et al. The image has a characteristic yellow tint Holger Merlitz explains in his book (2nd ed., page 177) that this is due to the use of special optical glass that is resistant to radiation. I see that I should have checked here when I was trying to understand the choices on telescope finders.I recently inherited a pair of these D.F. Produced to military specifications, it is extremely sturdy. D.F.6x Carl Zeiss Jena repair - posted in Binoculars: I usually hang out at the ATM and eyepiece forum, so this is the first time Ive posted in the binocular forum. This is the civil version of the main military binocular 7×40 EDF (“Einheits-Doppelfernrohr”) of the East German army (“NVA, Nationale Volks – Armee”), made in 1985. 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). Weight (measured, with eyepiece cover and strap): 936 g Range of individual diopter adjustment on each tube: +/- 7 dpt Usable eye relief (measured from rim of eyecup): 15 mm