Compact binoculars hunting binoculars dielectric high reflective prism mirror coating turn and slide eyecup area of use bird watching hunting nature travel magnification 12 x lens diameter 42 mm prism system roof exit pupil diameter 35 mm min focus distance 25 m angle of view 5 field of view in 1000 m 87 m twilight factor 224 relative brightness 12 25 focussing system central focus viewing straight binocular coating fully multi coated weigh