Carl Zeiss Jena Octarem 8×50

Specifications:

Objective diameter:  50 mm
Magnification:  8 x
Exit pupil: 6.25 mm
Eye relief (acc. to spec): 19 mm
Usable eye relief (measured from rim of eyecup): 15 mm
IPD:  56 – 74 mm
RFOV:  7.4  degrees = 130 m
AFOV (measured, rounded): 58 degrees
Minimum focus distance (measured): 4.35 m
Focus type: CF (direction of rotation from close to infinity: > clockwise)
Degrees of rotation of focus wheel from 4.35 m to infinity (measured): 280 degrees
Range of diopter adjustment (estimate): +/- 4 dpt*
Excess travel of focus wheel beyond infinity position (estimate): 4 dpt*
Prism system:  Porro I
Waterproof: spashproof
Weight (measured, with eyepiece cover and strap): 1‘072 g
Made in: DDR (East Germany)
*range of diopter adjustment not affected by position of focus wheel

Remarks:

Made only between 1985 and 1990, the Octarem was one of Carl Zeiss Jena’s top binocular models. This sample was produced in 1987. It’s field of view is not as wide as that of the Super-Nobilem 8×50 (see separate post, https://binocular.ch/carl-zeiss-jena-nobilem-super-8×50/), but still quite impressive, and the image of the Octarem appears slightly brighter, the binocular is also easier to hold and the focus knob easier to operate than on the Super-Nobilem.