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Leupold 10x42 BX-4 McKinley HD Binocular

B&H # LE10X42BX4MB MFR # 117790
Leupold 10x42 BX-4 McKinley HD Binocular

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Product Highlights

  • Extra Low-Dispersion Glass Objectives
  • Phase-Corrected BaK4 Roof Prisms
  • Fully Multicoated Optics
  • 64° Apparent Viewing Angle
  • Closed Bridge Configuration
  • Magnesium Alloy Chassis
  • Center Focus Wheel
  • Nitrogen-Filled Fogproof / Waterproof
  • Twist-Up Eyecups
  • Rubber Armored Housing
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The 10x42 BX-4 McKinley HD Binocular from Leupold houses high-definition optics inside a lightweight weather-sealed body that is both comfortable to handle and built to last. This general purpose optic delivers the imaging performance and durability needed by hunters and birders alike. Leupold equips the BX-4 with their Advanced HD Lens System, which combines extra-low dispersion objective lenses, phase-corrected BaK4 prisms, and proprietary optical coatings. The view transmitted by the BX-4 is bright and sharp, revealing impressive detail and color rendition across its expansive 64° apparent viewing angle.

In addition to its noteworthy optical performance, the BX-4 McKinley binocular also features a weather-resistant housing that is nitrogen-filled and built to perform in extreme humidity and heavy rainfall. When conditions turn wet or cold, several of the binocular's features help the observer maintain their grip; including textured rubber armoring and rubberized ridges on the focus wheel. Contoured thumb rests on the underside of the housing improve comfort and reduce the visibility of hand tremor by helping to balance the binocular in the viewer's hand.

Twist-up rubber eyecups with multiple click-stop positions as well as a generous 20mm eye relief outfit the binocular for a comfortable viewing experience even while wearing eyeglasses. A tripod adapter socket and an 8-foot minimum focus distance further complement the range of features that make the BX-4 McKinley HD a full-featured optic for close to mid-range glassing tasks. Leupold warrants the BX-4 binocular to be free of defects for the lifetime of the original owner.

Optical Performance
  • 10x magnification, 42mm objectives
  • Fully multicoated optics
  • Extra-low dispersion objective lenses
  • BaK4 prisms with phase-corrective coating
  • 6.4° angle of view, 64° apparent viewing angle
  • 8 ft close focus distance
  • 20mm eye relief
Use and Handling
  • Twist-up rubber eyecups
  • Mounting socket for tripod adapter
  • Slip-resistant center focus wheel
Construction Details
  • Nitrogen-filled housing for fogproof / waterproof performance
  • Magnesium alloy chassis
  • Slip-resistant rubber armored body
  • Textured gripping surfaces
  • Ergonomic thumb rests
  • 29 oz weight
Prism Type Roof
Magnification 10.0x
Objective Lens Diameter 42mm
Angle of View 6.4° (actual)
Field-of-View 336' @ 1000 yd / 111.55 m @ 1000 m
Minimum Focus Distance 8.2' / 2.50 m
Exit Pupil Diameter 4.2  mm
Eye Relief 20  mm
Interpupillary Adjustment 56 - 74 mm / 2.20 - 2.91"
Dioptric Correction Not Specified By Manufacturer
Focus Type Center
Tripod Mount Yes (Adapter Optional)
Dimensions 6.1" / 15.49  cm
Weight 29 oz / 822 g
Leupold 10x42 BX-4 McKinley HD Binocular
  • Carrying Case
  • Neck Strap
  • Lens Cloth
  • Limited Lifetime Warranty
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