Compact binoculars area of use nature travel magnification 10 x lens diameter 21 mm prism system roof exit pupil diameter 21 mm min focus distance 3 m angle of view 5 field of view in 1000 m 87 m twilight factor 145 relative brightness 4 41 focussing system central focus viewing straight binocular coating multi coated weight 195 g special features rubber armouring