When it comes to high-quality optical performance, the Barska 10x42 Level ED Binocular delivers. Equipped with Extra Low Dispersion (ED) glass, this binocular maximizes image quality to provide extraordinarily sharp and detailed images. A textured rubber coating provides both protection from external damage and a comfortable non-slip surface for a more secure grip. The optical quality of the Level ED 10x42 Binocular is further enhanced with BAK-4 prisms for increased clarity. The Level ED Binocular features an ergonomic design that provides viewers with long-term viewing comfort. The Level ED Binocular is o-ring sealed for complete waterproof protection and argon gas purged to eliminate any possibility of internal fogging.• Fully Multi-Coated Optics• Extra Low Dispersion (ED) Glass• BAK-4 Prisms• 100% Waterproof and Fogproof• Argon Gas Purged to Eliminate Fogging• Shock-Absorbing Rubber Armor• Large Center Focus KnobSpecificationsModel Number: AB12992Focus System: CenterPrism Type: RoofPrism Glass: BAK-4Magnification: 10xClose Focus: 8.2'Eye Relief: 15.2 mmObjective Lens: 42 mmExit Pupil: 4.24 mmField of View @ 1000 yds.: 341'Diopter: Right EyeOptical Coating: Fully Multi-CoatedWaterproof: YesFogproof: YesWeight: 24.8 oz. Finish: Matte BlackIncluded Accessories: Carrying Case, Neck Strap, and Lens ClothMfr. Warranty: Limited Lifetime Warranty BAK-4 prisms & fully multi-coated optics for increased clarity O-ring sealed & argon gas purged for waterproof & fogging protection Large center focus knob | Barska 10x 42mm WP Level ED Binocular