Universal binocular area of use nature bird watching travel magnification 8 x lens diameter 42 mm prism system roof exit pupil diameter 53 mm angle of view 714 field of view in 1000 m 125 m twilight factor 183 relative brightness 27 6 focussing system central focus viewing straight binocular weight 740 g included in delivery shoulder strap lens caps pouch special features rubber armouring outdoor function waterproof