Underwater binoculars compact binoculars area of use hunting nature travel magnification 10 x lens diameter 26 mm prism system porro exit pupil diameter 26 mm min focus distance 2 m angle of view 54 field of view in 1000 m 94 m twilight factor 161 relative brightness 6 80 focussing system central focus viewing straight binocular weight 850 g special features for spectacle wearers rubber armouring outdoor functions waterproof shockproof