Outdoor binoculars area of use nature bird watching outdoor sports magnification 8 x lens diameter 42 mm prism system roof exit pupil diameter 6 mm min focus distance 17 m angle of view 75 field of view in 1000 m 131 m twilight factor 183 relative brightness 27 56 focussing system central focus viewing straight binocular coating fully multi coated weight 654 g eye relief 18 special features rubber armouring water resistant oil repellant