Universal binocular outdoor binoculars area of use nature travel outdoor sports magnification 8 x lens diameter 42 mm prism system roof exit pupil diameter 53 mm min focus distance 2 m angle of view 81 field of view in 1000 m 142 m twilight factor 1833 focussing system central focus viewing straight binocular weight 690 g special features for spectacle wearers rubber armouring outdoor function waterproof prismenglas bak 4