Image stabilised binoculars area of use travel watersports magnification 15 x lens diameter 50 mm prism system porro exit pupil diameter 333 mm min focus distance 6 m angle of view 45 field of view in 1000 m 78 m twilight factor 274 relative brightness 11 09 focussing system individual focus viewing binocular straight weight 1 200 g special features rubber armouring