Outdoor binoculars area of use watersports golf bird watching travel nature outdoor sports magnification 12 x lens diameter 50 mm prism system porro exit pupil diameter 417 mm angle of view 53 field of view in 1000 m 92 m twilight factor 245 relative brightness 17 39 diopter correction 5 0 dpt focussing system central focus viewing straight binocular weight 1 000 g outdoor function waterproof