Universal binocular underwater binoculars area of use nature travel magnification 8 x lens diameter 25 mm prism system roof suitable for beginner expert exit pupil diameter 313 mm min focus distance 16 m angle of view 68 field of view in 1000 m 119 m twilight factor 141 relative brightness 9 8 focussing system central focus viewing straight binocular coating fully multi coated weight 241 g eye relief 15 colour black special features