The National Geographic Expedition Series 8x42 combines 8x magnification with BAK-4 prisms, fully multi-coated lenses, and 20.4mm eye relief — the most eyeglass-friendly binocular in the National Geographic lineup, with waterproof and fog-proof construction for all-weather field use.

Features

• 8x magnification with BAK-4 roof prisms — bright, high-contrast images with a wide, stable field of view
• Fully multi-coated lenses — maximum light transmission for clear views from dawn through dusk
• 20.4mm eye relief with twist-up eyecups — exceptionally generous clearance for comfortable full-field viewing with eyeglasses
• Waterproof and nitrogen fog-proof — sealed optics handle rain, humidity, and rapid temperature changes
• 4.5-meter close focus — near enough for garden birds and trail-side wildlife
• Single bridge roof prism design — ergonomic grip and balanced handling for extended observation
• Diopter adjustment — fine-tune focus independently for each eye
• Includes lens covers, neck strap, and carry case — field-ready out of the box

Ideal For

• Eyeglass wearers — 20.4mm eye relief is among the highest in this class, providing the full field without removing glasses
• Birders and wildlife watchers who want the wider field of view and steadier handheld image that 8x provides over 10x
• All-weather hikers — waterproof and fog-proof for trail conditions without worry
• Extended observation sessions — the wider exit pupil (5.25mm) and lower magnification reduce eye fatigue during long glassing