Universal binocular area of use watersports travel magnification 10 x lens diameter 42 mm prism system roof exit pupil diameter 42 mm min focus distance 15 m twilight factor 205 relative brightness 17 64 focussing system central focus viewing straight binocular coatings fully multi coated bak4 weight 737 g special features for spectacle wearers rubber armouring outdoor function waterproof