RSPB Sparrowhawk ED 8.5x42 Binoculars

The RSPB Sparrowhawk ED 8.5x42 Binoculars (product 55161591595383) give you 8.5x magnification through a 42mm objective lens. That pairing delivers a wide 140m field of view at 1000m and an exit pupil of just under 5mm solid performance in daylight and low light alike. The 8° angular field of view makes tracking fast-moving birds genuinely easy.

The optics use ED glass in the objective lens to cut chromatic aberration and keep colours accurate. The Schmidt-Pechan prism system uses BAK 4 glass with dielectric coatings and phase correction. Fully multicoated lenses combined with dielectric-coated high-transmittance prisms push light transmission to a high level images are sharp and colour-true edge to edge. Field flattening lenses keep the image crisp right to the edges.

The body is built from magnesium alloy keeping weight down to 700g. It is fully waterproof and nitrogen filled so internal fogging is not a problem in cold or wet conditions. Eye relief of 16.7mm makes these comfortable for spectacle wearers and the ergonomic magnesium chassis sits well in the hand during long sessions.

Backed by a 10-year manufacturer warranty these binoculars are built for serious birdwatchers. ED glass, dielectric prism coatings, field flattening lenses and a lightweight magnesium body make this a strong package for anyone who spends real time outdoors.

The 8.5x42 pairing gives an exit pupil of 4.9mm good for dawn and dusk use. ED glass in the objective reduces chromatic aberration so colour fringing is minimal. The Schmidt-Pechan roof prism uses BAK4 glass with dielectric coatings and phase correction to maximise light transmission and contrast. Fully multicoated lens surfaces cut reflection losses at every air-to-glass surface. Field flattening lenses keep sharpness consistent across the full 8° field. Nitrogen filling prevents internal fogging.

The chassis is magnesium alloy keeping weight to 700g. The body is rubber armoured for grip and protection. Objective lenses use ED extra-low dispersion glass. The Schmidt-Pechan prisms are BAK4 glass with dielectric and phase correction coatings. All external lens surfaces are fully multicoated.

Use a blower brush before wiping lenses never drag grit across the glass. Store in the supplied case away from moisture and heat. Check the hinge tension and eyecups regularly. The 10-year warranty requires you to avoid physical damage and unauthorised servicing. Keep your proof of purchase safe.