Outdoor binoculars area of use travel watersports outdoor sports magnification 7 x lens diameter 35 mm prism system porro exit pupil diameter 5 mm min focus distance 3 m angle of view 93 field of view in 1000 m 162 m twilight factor 157 relative brightness 25 diopter correction 2 0 dpt focussing system central focus viewing straight binocular weight 650 g special features rubber armouring