Brilliant optical performance and the most durable construction have made Steiner the world leader in marine optics.Navy SEALs and professional mariners worldwide rely on Steiner's superior image quality and incredible reliability, with optics designed to deliver superb low light performance, with cool, comfortable daytime viewing...and built mil. spec. tough: waterproof, fog proof and shock resistant. Steiner's high depth of field "Sports Auto-Focus" gives you a clear view of everything from 20 yards to infinity without refocusing - perfect for spotting buoys, markers and navigational hazards. The depth of field and Steiner's incredibly bright optics work especially well at night, when exact distance is uncertain.The new Commander XP with new XP Optics and water shedding NANO Protection hydrophobic optics are the brightest and most technologically advanced marine binoculars available. Steiner 7x50 Commander XP features Mil.spec waterproofing and a 30 year warranty.