The GPO Passion SD 10x42 Binoculars (Model: B250) are outdoor roof-prism optics designed for handheld mid- to long-range observation. Built around a lightweight magnesium alloy chassis with protective rubber armouring, the optical system utilises SD (Substantial Definition) glass elements, Schmidt-Pechan roof prisms with dielectric mirror coatings, and GPObright fully multi-coated lenses to deliver an 88% light transmission rating. The internal housing is nitrogen-purged and fully waterproof to prevent internal fogging across wet and humid field conditions.

Key Features

• Optical Performance: Features 10x magnification with 42 mm objective lenses, offering a linear field of view of 314 ft at 1,000 yards (~104.7 m at 1,000 m).
• Prism System: Dielectric-coated Schmidt-Pechan roof prisms paired with fully multi-coated SD glass elements ensure clear colour rendition and edge-to-edge clarity.
• Rugged Magnesium Chassis: Encased in rubber armouring, the body measures approximately 5.6 inches (~142 mm) in length and weighs between 22.2 oz and 24.6 oz (approx. 629 g to 697 g).
• Comfortable Viewing: Provides 16.1 mm of eye relief, a 4.2 mm exit pupil, multi-position rotating eyecups, and an adjustable interpupillary distance from 56 mm to 78 mm.
• Weatherproof Construction: Nitrogen-purged internal housing ensures waterproof integrity and fogproof performance during rapid temperature transitions.

Specifications

• Magnification: 10x
• Objective Lens Diameter: 42 mm
• Field of View: 314 ft at 1,000 yards (~104.7 m at 1,000 m)
• Close Focus: 9.8 ft (~2.98 m)
• Eye Relief: 16.1 mm
• Exit Pupil: 4.2 mm
• Interpupillary Distance (IPD): 56 mm – 78 mm
• Prism Type: Schmidt-Pechan roof prisms with dielectric coatings
• Chassis: Magnesium alloy with full rubber armouring
• Length: Approx. 5.6 inches (~142 mm)
• Weight: 22.2 oz – 24.6 oz (~629 g – 697 g)

Who is the GPO Passion SD 10x42 for?

• Open-Country Hunters — requires the 10x magnification and 42 mm objective lenses of this binocular to resolve distant game details across open ridgelines and broad fields within a 314 ft at 1,000 yards field of view.
• Mid-to-Long-Range Birdwatchers — relies on the 10x optical system to identify distant avian species beyond the reach of standard wide-angle optics down to a 9.8 ft minimum close-focus limit.

Less suitable for: Close-range macro viewing under the 9.8 ft minimum close focus, dense timber tracking where an 8x42 binocular provides a wider field of view, or stationary long-range surveillance beyond handheld stability limits where a tripod-mounted 15x50 optic is required.