Zoom binoculars area of use watersports travel magnification 8 x lens diameter 50 mm zoom factor 3 times prism system porro exit pupil diameter 625 mm min focus distance 8 m angle of view 45 field of view in 1000 m 78 m twilight factor 20 relative brightness 39 06 focussing system central focus viewing straight binocular coating fully coated weight 810 g included in delivery tripod adapter shoulder strap pouch cleaning cloth special fea