Children binoculars area of use nature travel magnification 6 x lens diameter 21 mm prism system roof suitable for children exit pupil diameter 35 mm twilight factor 112 relative brightness 12 25 focussing system central focus viewing straight binocular weight 190 g material plastic colour yellow included in delivery pouch cleaning cloth manual special features rubber armouring for spectacle wearers format compact eyecup types folding ru