Carl Zeiss Jena Jenoptem 10×50

Specifications:

Objective diameter:  50 mm
Magnification:  10x
Exit pupil: 5 mm
Eye relief (acc. to spec):  12 mm
Usable eye relief (measured from rim of eyecup): 7 mm
IPD:  48 – 71 mm
RFOV:  7.3  degrees = 128 m
AVOV (measured, rounded): 70 degrees
Minimum focus distance (measured): 5.85 m
Focus type: CF (direction of rotation from close to infinity: > clockwise)
Degrees of rotation of focus wheel from 5.85 m to infinity (measured): 220 degrees
Range of diopter adjustment (estimate): +/- 4 dpt*
Excess travel of focus wheel beyond infinity position (estimate): 6.5 dpt*
Prism system: Porro I
Waterproof: no
Weight (measured, with eyepiece cover and strap): 1‘067 g
Made in: DDR (East Germany)
*range of diopter adjustment not affected by position of focus wheel

Remarks:

The Jenoptem 10×50 W was produced from 1971 until 1990; this particular sample was made in 1986. 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. Even after more than 30 years, it’s optics still hold up quite well when compared with today’s quality binoculars.