Outdoor binoculars area of use watersports travel outdoor sports magnification 10 x lens diameter 42 mm prism system roof exit pupil diameter 42 mm min focus distance 5 m angle of view 6 field of view in 1000 m 105 m twilight factor 205 relative brightness 17 64 viewing straight binocular coating emerald weight 663 g special features for spectacle wearers