The value of the Vanguard Endeavor ED IV 10x42 Binocular is revolutionary and is the result of innovation from the Vanguard optical team. The unrivaled brightness, clarity, and lengthen viewing times make the ED IV complete with stunning differences.Optical Performance:1-0x 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 MultiGuard fully multi-coated optics improves light transmission for brighter high-contrast images with accurate color rendition-Wide 65 apparent angle of view-340' field of view at 1000 yards-Short 5.9' minimum focus distanceUse 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-Comfortable 4.2mm exit pupilConstruction 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 coversTheVanguard Optics 10x42 Endeavor ED IV Binocular gets upgraded with HOYA extra low-dispersion (ED) glass, phase-corrected SK-15 roof prisms, and their advanced MultiGuard optical coatings to improve light transmission, color rendition, clarity, and contrast; while eliminating chromatic aberration. These updated technologies and materials, combined with an exceptional 65 wide angle of view, work together to reduce the appearance of visible hand common in high power binoculars to present an immersive observational experience on the trail, at the range, in the stadium, or sightseeing around town. To pick out feather and fauna details, the binocular boasts an impressive 5.9' close focus distance.Prism Type: RoofMagnification: 10xObjective Lens Diameter: 42mmAngle of View: 6.5(actual)Field of View: 341.2' @ 1000 yd / 113.7m @ 1000 mMinimum Focus Distance: 5.9' / 1.8 mExit Pupil Diameter: 4.2 mmEye Relief: 19.0 mmInterpupillary Adjustment: 56.0 - 74.0 mm / 2.2 - 2.9"Dioptric Correction: 4Focus Type: CenterTripod Mount: Yes (Adapter Optional)Dimensions: 5.9 x 5.1" / 15.0 x 12.9 cmWeight: 27.7 oz / 785g