Universal binocular area of use travel nature bird watching magnification 8 x lens diameter 42 mm prism system schmidt pechan exit pupil diameter 42 mm min focus distance 15 m angle of view 85 field of view in 1000 m 148 m twilight factor 205 relative brightness 17 64 diopter correction 4 0 dpt focussing system central focus viewing straight binocular coating lotutec weight 780 g eye relief 18 special features for spectacle wearers