Compact binoculars hunting binoculars outdoor binoculars marine binoculars underwater binoculars area of use hunting nature watersports outdoor sports travel magnification 12 x lens diameter 25 mm prism system roof suitable for intermediate beginner expert exit pupil diameter 208 mm min focus distance 6 m angle of view 49 field of view in 1000 m 85 m twilight factor 173 relative brightness 4 33 focussing system central focus viewing straight