Snypex Knight ED 8X50 Waterproof/fogproof Binoculars for ALL Outdoor Activites 8X50 ed (extra-low dispersion glass) & bak-4, phase coated roof prisms Armored rubber binocular with 100% fully multi-coated optics, green-coated on four sides of the prisms Fully waterproof and fog proof, nitrogen filled, submerge to 1 meter for 15 minutes & field of view at 1000 yards - 361.6 ft. Minimum focus distance of 3.92 ft. and 20.34 mm long eye relief Prism type - open hinge /roof prism binoculars