Hunting binoculars outdoor binoculars underwater binoculars area of use hunting digiscoping travel nature outdoor sports magnification 10 x lens diameter 42 mm prism system roof exit pupil diameter 42 mm min focus distance 13 m angle of view 65 field of view in 1000 m 114 m twilight factor 205 relative brightness 17 64 focussing system central focus viewing straight binocular weight 640 g eye relief 15 outdoor function waterproof