RSPB Harrier X 8x42 Binoculars

The RSPB Harrier X 8x42 binoculars (product 49568980795699) pair 8x magnification with a 42mm objective lens. That combination gives you a 142m field of view at 1000m and an 18.4mm eye relief wide enough to track fast-moving birds without losing them. At 716g in a magnesium alloy body they are solid yet manageable for long sessions in the field.

The optical system uses ED extra-low dispersion glass alongside BAK-4 prisms with phase correction. Super High Reflective dielectric coatings on the prisms push brightness and contrast well above standard binoculars and the fully multi-coated optics keep colour fringing to a minimum. The result is a sharp, colour-accurate image edge to edge.

The magnesium alloy chassis is wrapped in shock-resistant rubber armour with thumb-holds built in. Fully waterproof and nitrogen-filled, so fogging is not a problem in cold or wet conditions. Twist-down eyecups with three settings make them practical for spectacle wearers. Close focus is tight enough to pick out butterflies and insects in detail.

A 10-year manufacturer warranty backs the build quality. ED glass, phase corrected prisms, dielectric coatings and a waterproof magnesium body make this a serious birdwatching tool at a competitive price point.

The 8x42 format produces a 5.25mm exit pupil good for low light use. BAK-4 prisms with Super High Reflective dielectric coatings maximise light transmission and push contrast above standard silver-coated prisms. Phase correction eliminates the phase shift that roof prisms introduce, recovering sharpness and resolution. ED glass reduces chromatic aberration so colour fringing is all but eliminated. Fully multi-coated optics on every air-to-glass surface cut reflections and keep the image bright. The 142m field of view at 1000m is wide for an 8x42 making target acquisition fast.

The chassis is magnesium alloy strong and light. It is wrapped in shock-resistant rubber armour that protects against knocks and improves grip. The optical elements use ED extra-low dispersion glass. Prisms are BAK-4 glass with Super High Reflective dielectric coatings and phase correction applied.

Brush dust off lenses before wiping with a microfibre cloth. Use only coated-optics lens fluid. Store in the case when not in use and keep dry. Check the hinge tension and eyecup action periodically. The 10-year warranty depends on normal careful use avoid impacts and never use abrasive materials on the lenses.