Outdoor binoculars area of use travel watersports outdoor sports magnification 10 x lens diameter 30 mm prism system roof exit pupil diameter 3 mm min focus distance 3 m angle of view 57 field of view in 1000 m 99 m twilight factor 173 relative brightness 9 diopter correction 4 0 dpt focussing system central focus viewing straight binocular coating swarobright weight 515 g special features for spectacle wearers rubber armouring outdo