Outdoor binoculars area of use nature bird watching outdoor sports magnification 8 x lens diameter 40 mm prism system roof exit pupil diameter 5 mm min focus distance 43 m angle of view 7 field of view in 1000 m 122 m twilight factor 179 relative brightness 25 focussing system central focus viewing straight binocular coating fully multi coated weight 720 g eye relief 14 special features rubber armouring prismenglas bak 4