Outdoor binoculars area of use watersports golf travel outdoor sports magnification 16 x lens diameter 50 mm prism system porro exit pupil diameter 313 mm min focus distance 10 m angle of view 4 field of view in 1000 m 70 m twilight factor 283 relative brightness 9 8 focussing system central focus viewing straight binocular weight 1 020 g outdoor function waterproof