Binoculars Carl Zeiss Jena Turact 8x24

Magnification: 8x
Aperture (objective diameter): 24 mm
Field of view: 6.3°
Exit pupil diameter: 3 mm
Visible field of view (eyepiece FOV): 50°
The closest focusing distance: 6 m
Width: 15.7 cm
Height: 9.7 cm
Weight: 362 g
Production date: 1921.

   In 1912, a very successful Telact 8x model was replaced by Turact 8x. Carl Zeiss decided to make a cheaper binocular, so he simplified the Turact design. The new binocular turned out to be much smaller and lighter, and respectively, more convenient in application. However, its field of view was decreased (from 6.6° to 6.3°) and the aberrations increased. Both binoculars were produced in parallel approximately from 1912 to 1915, and Turact production stopped around the end of 1920s.
   Turact is a “civilian” model; this fact is proved by the central hinge fixture’s (clamp’s) small diameter (see photo), which has a hole for a knob (included to binoculars delivery kit), with the help of which the hinge could have been finally fixed depending on the observer’s interpupillary distance. The interpupillary distances scale is indicated on the upper hinge disk. Similar military models are labeled as D.F.8x, D.F.8x24 and D.F.95 n/A.
   Turact was produced with various design changes in 2 versions:
   1st version: with the two-ring type lens frames (starting from 1912 and up to the mid of 1913); and with the eyepieces carcass having the “diagonal” knurling (see photo) https://binocollection.com/catalog/binoculars-carl-zeiss-jena-turact-8x.html
   2nd version: with rounded objective covers (starting from 1913 and up to the end of the 20s);
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   This device belongs to second design version. It has the eyepieces with base diameter equal to 20.5 mm and the top prism cover width equal to 46 mm (see photo). The eyepieces’ front lens diameter is equal to 10.5 mm. The eyepieces possess the diopter scale and the diagonal knurling. The binoculars case height (including upper prismatic cover) is equal to is 68.5 mm, the height without lens frame is 52 mm. There is an interpupillary distance scale on the upper hinge disc. Prism covers are attached to the housing with the help of one screw.
   The binocular “lost weight” significantly compared to this model’s previous version, namely from 455 g to 362 g. Also slightly changed the design of the eyepiece case (see photo).
   There are inscriptions “Carl Zeiss Jenna” on the left prism cover. There is also an inscription “Turact 1117555 8x24” on the right prism cover. The inscription is made in block letters against the background of Carl Zeiss Tessar photo lens schematic image.
   The binocular’s coffer has features peculiar to the post-war period: a “paramilitary” design with fastenings on the waist belt, the top cover fastening to the coffer’s carcass and specific rivets (see photo).
   The binocular’s serial number is “1117555” and it was released as a 200 pieces batch in 1921.
   The Turact’s "predecessor", namely the Telact model can be checked by the following link: https://binocollection.com/catalog/binocular-carl-zeiss-jena-telact-8x-1.html
   The Turactem 8x, the binocular’s model with central focusing, was released in 1914.