Universal binocular area of use nature astronomy travel magnification 12 x lens diameter 50 mm prism system roof exit pupil diameter 417 mm min focus distance 28 m angle of view 57 field of view in 1000 m 100 m twilight factor 245 relative brightness 17 39 diopter correction 4 0 dpt focussing system central focus viewing straight binocular coating swaroclean weight 998 g special features for spectacle wearers outdoor function water