Zoom binoculars area of use travel nature magnification 8 x lens diameter 50 mm zoom factor 25 times prism system porro exit pupil diameter 625 mm angle of view 48 field of view in 1000 m 84 m twilight factor 20 relative brightness 39 06 focussing system central focus viewing straight binocular weight 900 g special features rubber armouring outdoor function waterproof