Compact binoculars area of use travel watersports magnification 8 x lens diameter 21 mm prism system porro exit pupil diameter 263 mm min focus distance 25 m angle of view 64 field of view in 1000 m 111 m twilight factor 13 relative brightness 6 92 diopter correction 2 0 dpt focussing system central focus viewing binocular straight weight 170 g