The Minox 10x44 BL-HD Series Binocular features phase-corrected prisms, high density (HD) glass, anti-reflective multicoated optics, and anomalous partial dispersion (APD) similar to lens elements, to create an optical system with well-rounded performance in all light conditions. The phase-corrected prisms and HD glass increase resolution and contrast, while the APD elements reduce chromatic aberration, that produce clear and bright images with true color representation across the entire field of view without distortion. The optical tubes are nitrogen-filled and o-ring sealed for fogproof performance and they are rated to be submersible to 16 feet. Twist-up eyecups let you customize the eye relief whether you wear glasses or not. Housed inside a light, polycarbonate body which reduces handling fatigue as well as increased protection from impacsts, temperature, and corrosion. The open bridge configuration further limits weight. The Minox 10x44 BL-HD is a new cutting edge binocular to suit the needs of serious outdoors lovers.