Optolyth Royal 9×63
Objective diameter: 63 mm
Magnification: 9 x
Exit pupil: 7 mm
Eye relief (effective, measured from folded down eyecup): 14.5 mm
IPD: 63 – 74 mm
RFOV: 5.7 degrees = 100 m
AFOV (measured, rounded): 52 degrees
Minimum focus distance (measured): 5.1 m
Focus type: CF (direction of rotation from close to infinity: < anticlockwise)
Degrees of rotation of focus wheel from 5.1 m to infinity (measured): 525 degrees
Range of diopter adjustment (estimate): +/- 5 dpt*
Excess travel of focus wheel beyond infinity position (estimate): 8 dpt*
Prism system: Abbe-König
Weight (measured, with eyepiece cover and strap): 1‘233 g
Made in: Germany
*range of diopter adjustment not affected by position of focus wheel
Have you ever wondered why there are almost no roof prism binoculars with 60mm or more diameter of the objective lenses? This one has 63mm, and it’s not a problem for some, but if you happen the be a person with a relatively narrow interpupillary distance between your right and left eye, you will immediately recognize the issue. Minimum IPD of this bino is about 63mm (most other binoculars have 56-58mm minimum). You just can’t bring the two tubes closer together. That’s why binoculars with wide objective diameters tend to be Porro or some other prism design with a lateral offset.
The optics of the Royal 9×63 are okay, but not overly impressive; many actually prefer the 8×56 model with its more balanced performance.
see also remarks in separate post “Optolyth Royal 8×56”, https://binocular.ch/optolyth-royal-8×56/
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