Hunting binoculars area of use travel nature hunting magnification 10 x lens diameter 42 mm prism system porro exit pupil diameter 42 mm min focus distance 4 m angle of view 62 field of view in 1000 m 108 m twilight factor 205 relative brightness 17 64 diopter correction 5 0 dpt viewing straight binocular weight 790 g outdoor function waterproof