Outdoor binoculars area of use bird watching hunting travel outdoor sports magnification 12 x lens diameter 25 mm prism system roof exit pupil diameter 42 mm angle of view 55 field of view in 1000 m 96 m twilight factor 173 relative brightness 4 focussing system central focus viewing straight binocular coating ruby special features for spectacle wearers rubber armouring outdoor function waterproof