The Pentax 8x25 DCF SW Binocular offers high-resolution phase-coated and super-reflective coated roof prisms to provide high resolution, high contrast images. Waterproof and nitrogen filled (JIS Class6), the DCF SW models allow submersion up to 3 feet. The ultra compact, dual hinge design is exceptionally portable. Helicoid eyepieces ring with four click stops offer the most comfortable eye relief and the fully multi-coated lenses increase light transmission and color quality. The long eye-relief allows for viewing with or without glasses and the click-stop adjustment locks in the righteyepiece diopter. The Rubber covered exterior provides a sure grip and protects the internal mechanisms.