The Passion HD series of Binoculars are a perfect choice for bird watching, wildlife observation, and other outdoor activities. They feature a magnesium alloy frame to keep weight to a minimum. Like all products offered by German Precision Optics, the Passion HD Binoculars offer excellent optical quality. This is thanks to GPObright lens technology – a vacuum applied coating that allows 99.7% of available light to pass through each optical surface, resulting in a light transmission that can exceed 92%.Features: Incredible light transmission, 99.7% agsDouble HD glass technologyGPObright lens coating technologyCenter focusing locking diopterTough aluminum eyecup tubesMagnesium micro-bridge and bodyWaterproof and fogproofUltra eye reliefPASSIONdrop hydrophobic coating German Precision Optics GPO Passion 15x50 HD Charcoal Black Binocular w/Adapter B700