Universal binocular underwater binoculars area of use travel watersports wildlife watching outdoor sports bird watching magnification 10 x lens diameter 42 mm prism system schmidt pechan relative brightness 17 64 diopter correction 4 0 dpt focussing system central focus viewing straight binocular coatings lotutec multi coated special features for spectacle wearers rubber armouring extra wide field of view modern design ergonomic outdoor function wa