Zeiss 8×30 B Dialyt

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Objective diameter:  30 mm
Magnification:  8 x
Exit pupil: 3.75 mm
Usable eye relief (measured from rim of eyecup): 10.5 mm
IPD:  57 – 74 mm
RFOV:  7.7  degrees = 135 m
AFOV (measured, rounded): 61 degrees
Minimum focus distance (measured): 3.65 m
Focus type: CF (direction of rotation from close to infinity: > clockwise)
Degrees of rotation of focus wheel from 3.65 m to infinity (measured): 180 degrees
Excess travel of focus wheel beyond infinity position (estimate): 5 dpt
Prism system:  Schmidt-Pechan
Waterproof: splashproof
Weight (measured, with eyepiece cover and strap): 662 g
Made in: Germany



This early 1970s Dialyt used to be one of the very good roof prism binoculars in this size available at that time, with a nice field of view of 7.7 degrees, which was considerably more than what the same size Zeiss 8×30 Porro (see separate post, https://binocular.ch/zeiss-8×30-b/) from the 1960s provided (6.3 degrees). The missing phase coating becomes obvious in the lack of sharpness and contrast when compared with current good 8×30 roof binoculars, but also the 8×30 Porro model from Zeiss clearly outperformed the Dialyt in this respect. On the other hand, the light weight, compact size and nice sweet spot make this bino still a pleasure to use.


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