Zoom binoculars outdoor binoculars hunting binoculars area of use watersports nature hunting outdoor sports magnification 8 x lens diameter 40 mm zoom factor 2 times prism system roof exit pupil diameter 5 mm min focus distance 49 m angle of view 49 field of view in 1000 m 85 m twilight factor 179 relative brightness 25 focussing system central focus viewing straight binocular coating multi coated weight 750 g eye relief 15 special fe