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: 51 degrees
Minimum focus distance (measured): 5.1 m
Focus type: CF
Prism system: Abbe-König
Weight (measured, with eyepiece cover and strap): 1‘233 g
Made in: Germany
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/