Outdoor binoculars area of use golf bird watching travel nature outdoor sports magnification 8 x lens diameter 42 mm prism system roof exit pupil diameter 525 mm min focus distance 3 m angle of view 7 field of view in 1000 m 122 m twilight factor 183 relative brightness 27 56 focussing system central focus viewing straight binocular weight 795 g special features for spectacle wearers rubber armouring