Vanguard Endeavor ED IV 8x42 mm Binocular Black Endeavor ED IV. The binoculars in this series offer the innovative pairing of premium HOYA Extra-Low Dispersion (ED) glass with SK-15 prisms for the enhancement of light transmission and color fidelity. The Vanguard 8x42mm Endeavor ED IV Birding Binocular features an upgraded Tripod adaptor for those long viewing periods or for glassing at long distances. The Vanguard 8x42 Endeavor ED IV Waterproof Binocular is magnesium-constructed and houses with advanced MultiGuard Coatings for enhanced light transmission in all weather conditions including rain and humidity. Its SK15 phase-correction prism provides optimal image quality excellent light transmission and color fidelity for a remarkable viewing experience- even in low light conditions like dawn or dusk. The Vanguard 8x42 Endeavor ED IV Birding Binocular has a center focus wheel with a large textured groove that ensures precise focusing even with a dirty or oily lens or after prolonged use. Specifications for Vanguard 8X42 Endeavor ED IV Binocular: Manufacturer: Vanguard Color: Black Magnification: 8 x Objective Lens Diameter: 42 mm Exit Pupil: 5.25 mm Field of View Linear: 377 ft at 1000 yds Binoculars Focus System: Center Focus Twilight Factor: 18.3 Weather Resistance: Yes Water Resistance Level: Waterproof Weight: 27.73 oz Finish: Magnesium Alloy Magnification Type: Fixed Vanguard Endeavor ED IV 8420: Endeavor ED IV 8x42 mm Binocular Black