Underwater binoculars compact binoculars hunting binoculars area of use hunting nature travel magnification 10 x lens diameter 50 mm prism system roof exit pupil diameter 5 mm min focus distance 24 m angle of view 53 field of view in 1000 m 92 m twilight factor 224 relative brightness 25 focussing system central focus viewing straight binocular coating fully multi coated weight 805 g eye relief 20 special features for spectacle wearers