Barska 25×100 WP Cosmos Astronomical Binoculars (Matte Black)

Description

At 8.6 pounds with 100mm front glass, the Barska 25×100 WP Cosmos Astronomical Binoculars (Matte Black) is strictly a tripod-mounted platform, not an optic you hold to your eyes on a hike. The 25x magnification produces a 4.0mm exit pupil and a 157-foot field of view at 1000 yards (3.0-degree actual angle). It pulls in huge amounts of light, turning dim star clusters, lunar rilles, and distant marine traffic into bright, resolved targets.

Barska uses traditional BaK-4 Porro prisms with broadband fully multi-coated (FMC) surfaces to maximize photon transmission. The cast aluminum body is protected by thick matte black rubber, measuring 11.5 by 9.2 inches. Nitrogen purging and O-ring seals protect the huge internal air volume from nighttime dew and rain. Instead of a center wheel, it uses individual eyepiece focusing (IF) to set focus once per eye down to a 55.8-foot (17.0 m) close limit. Eye relief is 15.4mm with fold-down rubber cups, and a rigid central bar incorporates a sliding tripod mount for balance adjustment.

Key Features of Barska 25×100 WP Cosmos Astronomical Binoculars (Matte Black)

Engineered for stationary night-sky observation and coastal watchposts. The twin 100mm objective lenses offer true binocular summation, letting you pick out faint nebulae much more easily than through a small telescope with one eye shut.

• 25x magnification through dual 100mm light-collecting apertures
• BaK-4 Porro prisms delivering natural stereoscopic depth
• Broadband fully multi-coated (FMC) lenses for bright planetary contrast
• 157 ft field of view at 1000 yd (3.0-degree true field)
• 15.4mm eye relief with soft fold-down rubber eyecups
• Individual eyepiece focus system preventing bridge flex
• Nitrogen gas purged against heavy night dew and rain
• Built-in structural center bar with a sliding tripod balance block

100mm Light-Gathering & Porro Prism Physics

These 100mm lenses gather roughly four times more light than a standard 50mm binocular. The Porro prism path eliminates phase shifts naturally, delivering strong image contrast across the center of the field, though you will notice minor edge flaring on bright stars near the field stop.

Stationary Mass & Tripod Bar Balance

Handholding 8.6 pounds (3.9 kg) at 25x magnification is impossible; you will need a sturdy video fluid head. The sliding balance post along the central spine lets you find the true center of gravity, preventing your tripod head from tipping backward when pointed high toward the zenith.

• Independent helical ocular focusers lock critical focus without bridge play
• Nitrogen purging keeps damp evening air from fogging internal prism faces
• Sliding mounting block accepts standard 1/4-20 and 3/8-16 tripod screws

Barska Limited Lifetime Warranty & Case

Barska protects this large optic with their Limited Lifetime Warranty covering manufacturing and structural flaws under normal use. The complete factory package contains the Barska 25×100 WP Cosmos binoculars, heavy-duty hard transport case, objective lens covers, ocular protective caps, neck strap, and a lens cleaning cloth.