RSPB Harrier X 10x42 Binoculars

The RSPB Harrier X 10x42 binoculars (product 49568983515443) deliver 10x magnification through a 42mm objective lens. That pairing gives you a 116m field of view at 1000m and an exit pupil of 4.2mm solid performance for tracking birds in flight or scanning woodland edges. The 6.6-degree field of view makes it easy to pick up and follow fast-moving birds.

The optical system uses ED glass combined with phase-corrected BAK-4 prisms. Super High Reflective dielectric coatings on the prisms and fully multi-coated lenses work together to produce a bright and sharp image. The ED glass and phase correction all but eliminate colour fringing and boost contrast and resolution noticeably.

The body is magnesium alloy with shock-resistant rubber armour and thumb-holds for a secure grip. It weighs 693g. Fully waterproof and nitrogen-filled to prevent internal fogging. Twist-down eyecups have three settings making them well suited to spectacle wearers. The ultra-close focus distance lets you observe butterflies and insects in fine detail.

This is a well-built 10x42 with serious optical credentials. ED glass, dielectric prism coatings, phase correction and a magnesium body back up a 10-year manufacturer warranty. A strong choice for birdwatching.

The 10x42 configuration gives a 4.2mm exit pupil good for dawn and dusk use. BAK-4 roof prisms with super high reflective dielectric coatings maximise light throughput. Phase correction eliminates the contrast loss that roof prisms can introduce. ED glass reduces chromatic aberration so colour fringing is all but eliminated. Fully multi-coated lenses on every air-to-glass surface further boost brightness and sharpness. The result is a high-contrast image with accurate colour across the 116m field of view at 1000m.

The chassis is magnesium alloy lightweight and stiff. The outer shell is shock-resistant rubber armour with moulded thumb-holds. The optical elements use ED extra-low dispersion glass. Prisms are BAK-4 with super high reflective dielectric coatings and phase correction. The body is nitrogen-filled and fully sealed against water ingress.

Use a blower brush then a microfibre cloth to clean lenses. Never use household cleaners on coated glass. Store in a dry place and use the carry case when not in use. Check the hinge tension and eyecup action regularly. The 10-year warranty requires the binoculars to be used and maintained correctly.