Outdoor binoculars hunting binoculars optical system porro prism area of use hunting nature outdoor sports magnification 10 x lens diameter 50 mm prism system roof exit pupil diameter 5 mm min focus distance 55 m angle of view 66 field of view in 1000 m 114 m twilight factor 224 relative brightness 25 focussing system central focus viewing straight binocular coating fully multi coated weight 865 g eye relief 18 special features rubber