Binoculars Carl Zeiss Jena Turexem 6x21

Magnification: 6x
Aperture (objective diameter): 21 mm
Field of view: 8.5°
Exit pupil diameter: 3.5 mm
Visible field of view (eyepiece FOV): 50°
The closest focusing distance: 4.6 m
Width (max): 11 cm
Height (max): 8.7 cm
Weight: 320 g
Production date: 1920.

   In 1914, compact binoculars Carl Zeiss Turex 6x and Carl Zeiss Turexem 6x (with central focusing) appeared in the T180 Carl Zeiss Jena catalog. Structurally, these two binoculars are similar to the Turol 4x and Turolem 4x models, but they have a magnification of 6x and a lens diameter of 21 mm. Turex 6x and Turexem 6x are positioned in the catalog as lightweight and compact binoculars for travel and tourism.
    However, there is information that the first instances of Turex 6x appeared in 1913. This model was produced until about the mid-20s. Unlike Turol 4x, Turex 6x has no military counterpart.
   Turex 6x, Turexem 6x (like Turol 4x) had the same distance between the lenses and the eyepieces (base), which affected the binocular’s plasticity negatively. It was a rather unusual design solution for Carl Zeiss binoculars of that time, since there even was a condition of Carl Zeiss patent in the period from 1896 to 1908, according to which other manufacturers of prismatic binoculars were required to produce their models with the same distance between the lenses and the eyepieces. This design decision may have been dictated by the desire to reduce the size and weight of these devices.
   To date, there are several modifications of Turexem 6x binoculars with minor design differences:
   - with rounded front element hood with anti-flare grooves. The body of the eyepieces has a diagonal knurling. The upper disc of the center pivot has a "recessed" design.
   - with rounded front element hood without anti-flare grooves. The shape of the eyecups and the design of the upper disk of the central hinge have changed. The body of the eyepieces has a longitudinal knurling. (see photo)
   These binoculars are the second iteration of the original design. The base diameter of the eyepieces is 20.6mm and a top prism cap width is 38.5mm (see photo). The front lens eyepiece diameter is 10.5 mm. Eyepieces have a diopter scale and longitudinal knurling. The binoculars’ body height (including the top prism cover) is 56 mm and 39.5mm without the objective lens assembly. Prism covers are pressed against the binoculars’ body by the objective covers and "skirts" at the base of the eyepieces. On the side, the prism covers are attached to the body with a single screw.
   Inscriptions on the left shoulder of the central focus "Carl Zeiss Jenna". On the right shoulder - "Turexem 1078268 6x21". The inscription is printed in block letters against the background of a schematic image of a Carl Zeiss Tessar photographic lens.
   The front prism covers are labeled “CAM LAFONTAINE HAZEBROUCQ” “IG.R. De LA PAIX PARIS. This is, probably, one of the resellers of Carl Zeiss binoculars in France.
   The storage case for these binoculars has features typical for that period (see Hans T.Seeger. Zeiss Handfernlaser 1919-1946, Modelle-Merkmale-Mythos, p.607-627) with characteristic rivets and an embossed "Carl Zeiss Jenna" logo. The peculiarity of the case is the presence of large "military" loops for attaching the case to a belt. Probably, this feature is not a sign of the military use, but rather a sign "fashion" for military attributes during that period of German history (the end of the First World War - see photo).
   The binoculars have a serial number "1078268" and a batch of 200 pieces was produced in 1920.
   Binoculars Turex 6x with split focus