When you need 10x reach for distant plumage ID but can't afford color fringing to blur the details, ED glass is the answer. The Alpen Chisos 10x42 pairs extra-low dispersion glass with PXA phase-coated prisms to deliver the color accuracy and edge sharpness that 10x demands — in a lightweight magnesium chassis that handles all-day field use.

Key Features

• ED Glass — Extra-low dispersion elements eliminate chromatic aberration at 10x, keeping plumage colors true and fine detail sharp against bright sky and backlit canopy.
• PXA Phase-Coated BaK-4 Roof Prisms — Phase correction preserves resolution and contrast edge-to-edge for confident ID work at distance.
• Fully Multi-Coated Optics — Every air-to-glass surface treated for maximum light transmission and minimal glare under overcast skies and forest canopy.
• 6.5-Foot Close Focus — Tight enough for feeder birds, butterflies, and wildflowers at arm's length — versatile across near and far subjects.
• Lightweight Magnesium Housing — Durable yet comfortable for all-day carry with textured grip panels for secure handling in wet conditions.
• Waterproof & Nitrogen-Filled — Sealed against rain and humidity, internally fog-proof through rapid temperature swings.
• 16mm Eye Relief with Twist-Up Eyecups — Comfortable viewing for glasses wearers across extended sessions.
• 305ft Field of View at 1,000 yds — Wide enough to track birds and scan open terrain at 10x without constant repositioning.

Ideal For

• Birders who want more reach — 10x pulls distant subjects closer than 8x while ED glass keeps the color accuracy needed for plumage ID.
• Hikers and nature observers who want ED glass quality in a lightweight, weatherproof package for all-day trail use.
• Hunters who glass ridgelines and treelines in variable light and need color-accurate, high-contrast views at distance.
• Glasses wearers who need comfortable eye relief without sacrificing field of view.
• Mid-range upgraders stepping up from non-ED optics and wanting a meaningful improvement in sharpness and color fidelity at 10x.