The revolutionary Vanguard Endeavor ED IV 8x42 Binocular is the result of innovation from the Vanguard optical team. Unrivaled brightness, clarity, and extended viewing times allows master birders and serious outdoorsman to experience viewing nature in a totally ne.w dimension. Optical Performance: - 8x magnification - 42mm objective lens diameter - Phase-corrected prisms provides improved light reflection, high-contrast, and true color fidelity - SK-15 prisms have a higher refractive index than BK7 and BAK4, with a lower dispersion than BAK4 - HOYA extra-low dispersion (ED) lenses virtually eliminates chromatic aberration for true color transmission across the entire field of view - Anti-reflection Advanced Multi-Guard fully multi-coated optics improves light transmission for brighter high-contrast images with accurate color rendition - 377' field of view at 1000 yards - Short 5.9' minimum focus distance Use and Handling: - Open-bridge/Dual-hinge design - Large knurled center focus wheel is easy to manipulate even when wearing gloves - 56-74mm interpupillary adjustment range - 4 center locking dioptric adjustment - Three-stage click-stop twist-up eyecups for comfortable use with or without eyewear - Tripod mountable with optional adapter - Exceptionally long 19mm eye relief - Wide 5.25mm exit pupil completely covers fully dilated pupils in low-light to provide a full-frame view without vignetting Construction Details: - Bridge design reduces weight and provides a more comfortable and secure grip by allowing user's hands to wrap completely around the optical tubes - Lightweight and durable magnesium-alloy chassis - Nitrogen-filled and O-ring sealed to be waterproof, and resistant to internal fogging when moving through extreme temperature changes and environmental conditions - Textured rubberized armor provides a slip-resistant grip in cold and wet weather - Flip-down tethered objective lens covers Specifications: - Model: V242651 - Prism Type: Roof - Magnification: 8x - Objective Lens Diameter: 42mm - Angle of View: 7.2 (actual) - Field of View: 378.0' @ 1000 yd / 126.0 m @ 1000 m - Minimum Focus Distance: 5.9' / 1.8 m - Exit Pupil Diameter: 5.25 mm - Eye Relief: 19.0 mm - Interpupillary Adjustment: 56.0 - 74.0 mm / 2.2 - 2.9 Inch - Dioptric Correction: 4 - Focus Type: Center - Tripod Mount: Yes (Adapter Optional) - Dimensions: 5.9 x 5.1 Inch / 15.0 x 12.9 cm - Weight: 27.7 oz / 785 g