Description The performance and compactness of these spotting scopes are second to no other scopes in this class. The housing is waterproof to JIS protection class 7 and filled with dry nitrogen gas to prevent the lens from fogging These PROMINAR models use an XD objective lens with low dispersion properties to diminish chromatic aberration. The well established Kowa focus system has progressed to a new dual focus system. The quick focus, with a large and easy to turn knob, will focus from infinity to 16 feet in two revolutions. The fine focus, with smooth movements and pinpoint accuracy, is extremely useful at high magnifications and for Digi scoping systems. Specs Weight 3 lbs 12 oz Magnification Range 20 - 60x Objective Lens Diameter 77 mm Body Style Straight Length 11.96" Close Focus 16" Weatherproofing Waterproof & Nitrogen gas filled Manufacturer Warranty 10 years