The eyepieces’ base diameter is equal to 24.5 mm, the eyepieces’ front lens diameter is equal to 13.3 mm. This binocular specimen belongs to the 3rd design version (see above). The interpupillary distances scale is indicated on the upper hinge disk. The binocular’s “military" application is proved by the large diameter of the central hinge clamp (lock) (see photo). Ģnd version: the one with long double-ring type lens frames, leather-covered and with a short case (starting from 1909/10 and up to 1911) ģrd version: the one with short double-ring type lens frames (starting from 1911 and up to 1913/14) Ĥth version: the one with rounded objective covers (starting from 1913/14 and up to 1917 in two versions: with the grooves to minimize stray light and without them) and. The Marineglas was produced in several design versions starting from 1907/08 and up to 1917:ġst version: the one, where the lower prismatic cover and the lens frame cap are made as one component (starting from 1907/1908 and up to 1909) and having the eyepieces case with the “transverse” knurling. Later the binocular name was changed to D.F.6x30. The Marineglas was produced from 1907/08 and up to 1917 with various modifications. Although the name of this device is translated as the "sea glass", it was not widely used in the German Navy: only some batches entered the fleet. The device turned out to be very successful, with high aperture ratio, plasticity and large field of view, that is why it became popular in the army. It is the first binocular model with 30mm lenses. The Marineglas is a military analogue of a "civilian" model Silvamar with similar characteristics. Zeiss-Feldstecher, Handfernglaser von 1894-1919, Modelle-Merkmale-Mythos, pp.399-414) Actually, the binoculars have survived in such appearance up to present days (see Hans T.Seeger. It helped increasing the device’s reliability greatly. Moreover, the prisms inside the binoculars were no longer pressed by prism covers – they were fixed with the help of special flat springs instead. The optical characteristics were significantly improved in new devices (the field of view and the objective diameter were increased, optical aberrations were decreased), and the devices’ design was also changed: the central hinge and the “lugs” for a neck strap were not attached to binocular with the help of screws any more, they became integral with it instead, an eccentric objective alignment system appeared and its frame design was also changed, the prism covers spanned the binoculars’ carcass, and they were lubricated with a special compound at the joint points in order to improve impermeability. The new devices’ detailed characteristics were published in the 74-th volume of Carl Zeiss catalog in August 1907. Even after more than 30 years, it’s optics still hold up quite well when compared with today’s quality binoculars.In 1907, Carl Zeiss radically changed the framework and the design of his binoculars, replacing "civilian" models Feldstecher 6 Fach by Telex, Feldstecher 8 Fach by Telact, Jagdglas by Silvamar and Feldstecher 12 Fach by Telefort. It features an impressively wide field of view and, due to the wide IPD range, can be used by people with a very narrow IPD. The Jenoptem 10×50 W was produced from 1971 until 1990 this particular sample was made in 1986. * range of diopter adjustment not affected by position of focus wheel Weight (measured, with eyepiece cover and strap): 1‘067 g Range of diopter adjustment (estimate): +/- 4 dpt*Įxcess travel of focus wheel beyond infinity position (estimate): 6.5 dpt* Minimum focus distance (measured): 5.85 mįocus type: CF (direction of rotation from close to infinity: > clockwise)ĭegrees of rotation of focus wheel from 5.85 m to infinity (measured): 220 degrees Usable eye relief (measured from rim of eyecup): 7 mm
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