Zoom binoculars area of use travel watersports magnification 10 x lens diameter 60 mm prism system porro exit pupil diameter 167 mm angle of view 37 field of view in 1000 m 64 m twilight factor 245 relative brightness 36 focussing system central focus viewing straight binocular included in delivery cleaning cloth shoulder strap pouch manual special features rubber armouring prismenglas bk 7