Sporting a powerful magnification, extra low-dispersion glass, and their proprietary Twilight Max HD Light Management System, Leupold 10x42 BX-4 Pro Guide HD Binoculars,
in subdued gray, deliver bright and sharp high-contrast images with
true-to-life color and crisp clarity even when observing at medium to
long-range.
Image quality is enhanced through the use of
phase-corrected coatings on the prisms. The lenses are made of
high-transmittance calcium-fluoride glass, which, by their nature, limit
reflection and increase color fidelity and contrast. The Twilight Max
HD system complements the glass with index-matched lens coatings that
were specifically engineered for the calcium-fluoride lenses to raise
the already-high transmittance across the entire visible spectrum — with
special emphasis on the blue and violet wavelengths that are most
prevalent in low light, such as at dawn and dusk. Their 42mm objectives
gather generous amounts of light to further boost performance in
less-than-ideal conditions without the bulk and weight of larger
objectives, while a wide angle of view helps to reduce the appearance of
distracting hand shake that is often associated with powerful optics.
All of these optical features work together to present the user with a
comfortable and immersive observational experience.
Designed to
withstand the rigors of the trail, the optical tubes are nitrogen-filled
and O-ring sealed to make them waterproof and resistant to internal
fogging when moving through extreme temperature variations. The chassis
is made from an aluminum alloy to make it lightweight and corrosion
resistant without sacrificing strength and stability. To further cut
weight while providing users with more area to grip, Leupold employs an
open-bridge configuration with a dual hinge. Its oversized, knurled
center focusing wheel allows for sharp focusing even while wearing
gloves. For long-duration glassing sessions, or to reduce fatigue and
visible hand shake that are common with high magnifications and large
objectives, the Pro Guide HD can be mounted on a tripod or other support
system using an optional adapter.