Compact binoculars area of use travel nature magnification 12 x lens diameter 25 mm prism system porro exit pupil diameter 208 mm min focus distance 35 m angle of view 45 field of view in 1000 m 78 m twilight factor 173 relative brightness 4 33 diopter correction 2 0 dpt focussing system central focus viewing binocular straight weight 280 g