Outdoor binoculars area of use travel nature outdoor sports magnification 10 x lens diameter 42 mm prism system roof suitable for intermediate beginner expert exit pupil diameter 42 mm min focus distance 24 m angle of view 6 field of view in 1000 m 105 m twilight factor 205 relative brightness 17 64 focussing system central focus viewing straight binocular coatings xtr multi coated pc phase coating weight 740 g material magnesium col