Compact binoculars underwater binoculars area of use watersports nature bird watching travel magnification 10 x lens diameter 25 mm prism system roof exit pupil diameter 25 mm min focus distance 32 m angle of view 51 field of view in 1000 m 90 m twilight factor 158 relative brightness 6 25 diopter correction 3 5 dpt focussing system central focus viewing straight binocular weight 265 g included in delivery pouch lanyard lens caps o