The GPO PASSION™ HD 10x50 Binoculars (Model B660) are high-transmission roof-prism optics engineered for low-light hunting, dawn-and-dusk scouting, and open-country observation. Built with double-laminated HD glass and Schmidt-Pechan prisms, the optical system delivers 91–92% daylight light transmission via proprietary GPObright™ multi-coatings. The 50 mm objective lenses and 5.0 mm exit pupil provide superior low-light gathering compared to standard 42 mm platforms, while PASSIONdrop™ hydrophobic and oleophobic exterior coatings actively shed water and dirt. The internal optics are housed in a lightweight magnesium alloy micro-bridge chassis, fully nitrogen-purged for fogproof performance and waterproof-tested to 300 mbar.

Key Features

• High-Transmission Optical Glass: Double-laminated HD glass combined with GPObright™ lens coatings delivers 91–92% daylight light transmission for enhanced clarity during low-lux transitions.
• Robust Magnesium Micro-Bridge: Balances weight across a durable magnesium alloy housing with solid aluminium twist-up eyecups and an integrated center-locking diopter wheel (-2.5 to +2.5 dpt).
• Environmental Protection: Nitrogen-purged housing prevents internal fogging, provides 300 mbar waterproofing, and features PASSIONdrop™ outer lens coatings to repel water, dust, and oil.
• Tripod Adaptable: Includes an integrated 1/4"-20 threaded mount concealed beneath the front bridge cap for stationary glassing setups.

Specifications

• Magnification: 10x
• Objective Lens Diameter: 50 mm
• Field of View: 103 m @ 1,000 m (309 ft @ 1,000 yd / ~5.9°)
• Exit Pupil: 5.0 mm
• Eye Relief: 19.5 mm
• Close Focus Distance: 2.8 m
• Interpupillary Distance (IPD): 58 mm to 76 mm
• Diopter Compensation: -2.5 to +2.5 dpt (center-locking)
• Dimensions: 175 mm (L) × 135 mm (W) × 64 mm (H)
• Weight: 960 g (without covers)
• Water Resistance: 300 mbar

Who is the GPO Passion HD 10x50 for?

• Low-light and dawn-and-dusk hunters — Rely on the GPO Passion HD 10x50's 50 mm objective lenses and 91–92% daylight light transmission to identify game in heavy timber and during low-lux dawn and dusk transitions.
• Open-country wildlife spotters — Benefit from the 10x magnification, 103 m @ 1,000 m field of view, and stable 960 g magnesium chassis for hand-held scanning over medium-to-long distances.
• Eyeglass-wearing observers — Utilize the generous 19.5 mm eye relief and multi-step aluminium eyecups on these low-light hunting binoculars to maintain a complete field of view without removing corrective lenses.

Less suitable for: Backcountry hunters prioritizing ultralight pack weights under 800 g (who are better served by compact 8x32 or 10x42 binoculars), macroscopic botanical observers requiring a close focus under 2.8 m (who require dedicated close-focus optics), or stationary glassers needing magnifications beyond 12x to 15x (who will prefer dedicated spotting scopes or high-magnification tripod-mounted optics).