The Sig Zulu4 HD Marine HD glass lenses pair high definition and high transmittance glass for ultra-high resolutionand light transmission. Featuring proprietary anti-reflective SpectraCoat LensArmor and LenShield technologies two position adjustable eyecups focus wheel and diopter ring with a precision contour overmold provides ultra-fine adjustment; reinforced metal housing wrapped in rubber armor offering durability with a sleek appearance IPX7 waterproof and fog proof. Capable of being mounted to tripod adapter using a standard 1/4″-20 threaded insert. Includes molded EVA carrying case and floating neck strap.