Bushnell Elite 8X42 E2 Black Roof ED Glass Aspheric Lens Binocular with Optic Guard Binocular Harness, Tripod Adapter Black and 5 piece Deluxe Cleaning Kit Advanced Hybrid Lens System: delivers 90% light transmission; Fully multi-coated fluoride ED lenses for enhanced color, resolution, contrast. ED lenses nearly eliminate chromatic aberrations and color-fringing. XTR lens coating technology: 60 layers of anti-reflective coatings for maximum light transmission. RainGuard HD water-repellent lens coating causes moisture from rain, snow, sleet, and condensation to bead up and scatter less light; BAK4 roof prisms with PC-3 phase correction coatings provide maximum clarity, resolution, color-rendition, and viewing precision. Substantial eye relief and twist-up eyecups provide a comfortable customized fit with or without eye/sunglasses; Rugged magnesium housing is nitrogen filled and o-ring sealed for waterproof all-weather reliability and performance. Durable and tactile rubber armoring and a scratch-resistant powder-coat finish offers secure handling and enhanced wear-protection Center focusing system with a locking diopter adjustment provides fast and accurate adjustments for instant clear viewing