Universal binocular underwater binoculars area of use nature travel magnification 8 x lens diameter 42 mm prism system roof suitable for beginner intermediate exit pupil diameter 525 mm min focus distance 2 m angle of view 82 field of view in 1000 m 142 m twilight factor 183 relative brightness 27 56 focussing system central focus viewing straight binocular coating fully multi coated weight 730 g eye relief 18 colour black special fe