Objective diameter:  40 mm
Magnification:  10 x
Exit pupil: 4.0 mm
IPD: 52  –  71 mm
Usable eye relief (measured from rim of folded eyecup): 10.5 mm
RFOV:  5.8  degrees = 102 m
Focus type:  CF
Prism system:  Porro I
Waterproof: splashproof
Weight (measured, with eyepiece cover and strap): 591 g
Made in: Germany



The Alpin series was Optolyth’s venture into the Porro design; currently, the series is not produced anymore. The Alpin 10×40 may have been one of the lightest 10×40 binoculars ever; its optics were okay (not up to the current standard of similarly priced binoculars), but mechanical quality was only average (bridge rocking); its heavy rubber armour made it look very solid, probably more so than it actually was.

see also remarks in separate posts “Optolyth Royal 8×56” and “Optolyth Royal 9×63”



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