Spotting scope area of use nature bird watching wildlife watching golf hunting magnification 20 x lens diameter 80 mm prism system porro exit pupil diameter 12 mm angle of view 3 field of view in 1000 m 69 m twilight factor 40 relative brightness 16 focussing system central focus viewing monocular coating multi coated weight 1 170 g included in delivery pouch eyepiece camera adapter tripod special features for spectacle wearers