Outdoor binoculars area of use travel nature outdoor sports magnification 8 x lens diameter 42 mm prism system roof suitable for expert intermediate exit pupil diameter 525 mm min focus distance 18 m angle of view 63 field of view in 1000 m 110 m twilight factor 183 relative brightness 27 56 focussing system central focus viewing straight binocular coating fully multi coated weight 638 g material magnesium colour black included in d