The GPO PASSION™ ED 10x42 Binoculars (Desert Sand) are roof-prism hunting optics engineered for medium-to-long-range observation and target identification across open country and arid scrub. Built around extra-low dispersion (ED) optical elements and Schmidt-Pechan BAK-4 prisms, they utilize proprietary GPObright™ multi-layer vacuum coatings to achieve approximately 90% daylight light transmission while suppressing chromatic aberration. The optical assembly is housed in a rubber-armoured magnesium alloy micro-bridge chassis, delivering a fully sealed, nitrogen-purged platform capable of withstanding harsh environmental conditions.

Key Features

• Optical System: 10x magnification paired with 42 mm objective lenses, offering a 113 m to 114 m field of view at 1,000 m (6.5° angular field of view).
• Chassis & Weatherproofing: Nitrogen-purged magnesium alloy body with a Desert Sand rubber armour finish, waterproof-rated to 200 mbar to prevent internal fogging and moisture ingress.
• Comfort & Handling: Features 16 mm eye relief with aluminium click-stop twist-up eyecups, an interpupillary distance adjustment of 56 mm to 75 mm, and a close focus limit of 2.0 m.
• Mounting Interface: Integrated standard 1/4"-20 thread allows attachment to tripod adapters for extended observation.

Specifications

• Magnification: 10x
• Objective Lens Diameter: 42 mm
• Prism Type: Schmidt-Pechan (BAK-4 glass)
• Exit Pupil: 4.2 mm
• Eye Relief: 16 mm
• Field of View: 113 m – 114 m at 1,000 m (6.5°)
• Close Focus: 2.0 m
• Interpupillary Distance: 56 mm – 75 mm
• Dimensions: 145 mm (L) × 130 mm (W) × 55 mm (H)
• Weight: 670 g to 725 g
• Waterproof Rating: 200 mbar
• Tripod Adapter Thread: 1/4"-20

Who is the GPO Passion ED 10x42 for?

• Spot-and-stalk big game hunters — requires 10x magnification and a 42 mm objective lens to resolve game across open country and scrub while keeping total carry weight between 670 g and 725 g inside a 200 mbar waterproof magnesium chassis.
• Birdwatchers and wildlife observers — relies on a 2.0 m close focus distance paired with ED glass elements and 16 mm eye relief for detailed close-in feather and plumage identification without colour fringing.

Less suitable for: Extreme low-light observation, late dusk, or heavy canopy hunting where a 4.2 mm exit pupil restricts brightness compared to an 8x42, 8x56, or 10x56 binocular with a larger exit pupil; or prolonged multi-hour glassing sessions where hand-holding a 10x optic causes fatigue without the aid of a tripod mount.