The Kowa BDII-XD Binoculars feature ED (Extra low dispersion) glass to improve optical performance by increasing light transmission ensuring an image with edge to edge sharpness and virtually zero chromatic aberration (color blur). These binoculars are fully waterproof, dry nitrogen filled to prevent the lenses from fogging, and have Kowa’s KR coating to protect from dirt and other foreign residue build-up. The BDII-XD benefits from a magnesium alloy chassis surrounded by a protective layer of rubber armor. This lightweight, rugged structure can tolerate the severest conditions and provides a sense of security and longevity while providing a sure, comfortable grip. One of the stand-out optical features of the BDII-XD series is their enviable large field of view. Find a subject quicker with a wider view of your surroundings with sharpness right into the corners of the image, whilst still enjoying crystal clear clarity. The ergonomic body of the BDII-XD series is as impressive as the optics it protects with every curve considered to make observation both relaxing and free from fatigue. Features of the Kowa BDII-XDED (Extra Low Dispersion) Glass – Increases light transmission, edge-to-edge sharpness, and lowers chromatic aberration (color blur)KR Coating – Repels dirt and fluidMagnesium Alloy Chassis - Lightweight and ruggedRubber Armor – Comfortable grip and increased durabilityNitrogen Purged - Waterproof and fog proofWide Angle Lenses – Large Field of View, find subject quicker with less panningSmooth Twist Eye-cups – For both eyeglass and non-eyeglass wearers Kowa BDII-XD 8x42mm Wide Angle Roof Prism Binoculars