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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.
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
Nitrogen-filled housing for fogproof / waterproof performance