Outdoor binoculars area of use watersports golf travel outdoor sports magnification 20 x lens diameter 50 mm prism system porro exit pupil diameter 25 mm min focus distance 15 m angle of view 32 field of view in 1000 m 56 m twilight factor 316 relative brightness 6 25 diopter correction 4 0 dpt focussing system central focus viewing straight binocular weight 750 g