High-density extra-low dispersion glass delivers impressive resolution and color fidelity. Proprietary XR anti-reflective coatings, fully multicoated on all air-to-glass lens surfaces, increase light transmission for maximum brightness. Phase-correction coating enhances resolution and contrast. Ultrahard, scratch-resistant ArmorTek coating protects exterior lenses from scratches, oil and dirt. O-ring seals prevent moisture, dust and debris from entering the optics. Argon gas purging guarantees fogproof and waterproof performance. Rubber armor provides a secure, nonslip grip and durable external protection. Ergonomic open-hinge design fits comfortably in your hand. Twist-up eyecups adjust for a custom fit with or without eyeglasses. Right-eye diopter adjusts for differences in a users eyes. Compatible with a tripod adapter. Includes rainguard, tethered objective lens covers, neck strap and deluxe padded carry case. Manufacturers unlimited lifetime warranty.