Universal binocular binocular telescope area of use nature travel magnification 8 x lens diameter 40 mm prism system porro exit pupil diameter 5 mm min focus distance 4 m angle of view 82 field of view in 1000 m 143 m twilight factor 179 focussing system central focus viewing straight binocular monocular weight 698 g special features for spectacle wearers rubber armouring outdoor function waterproof