The Pentax 8.5x21 Papilio II is a unique binocular. Of course it’s a fine and compact companion on nature trails and holidays, but when your interests turn to flowers, insects, bugs or butterflies the Papilio turns out to be an indispensable instrument. No other binocular combines fine handling and easy viewing with an unsurpassed close focus of only 20 inches! You can observe nature in its natural habitat without disturbing or missing the finest detail. Other important elements include aspherical lens elements for edge-to-edge sharpness, BaK4 prisms and multi-coated lenses to enhance brightness & contrast. The Pentax U-Series Papilio also features a rugged inverted porro prism dual axis single body design with synchronized IPD adjustments.