"This Pentax binocular series is called Papilio, the Latin word for butterfly. PENTAX Papilio 8.5x21 binoculars are the perfect choice for insect observation in the field and in museums and galleries. The enhanced observation capability of the Papilio binoculars is made possible by a PENTAX Convergent Lens Optical System Engineering (CLOSE) mechanism. The CLOSE mechanism automatically slides the left and right objective lenses toward the center when the focus is fixed at a short distance. Don't miss a moment. Indoor or out. Suddenly so close you can almost touch it. That's because PENTAX quality and clarity are within reach, at a price that's within reach, too. These compact porro-prism models feature a dual-axis, single body design with synchronized eyepiece adjustment. Aspherical lens elements give you edge-to-edge sharpness. Clear images and clearly affordable. Fully multi-coated optics assure maximum light transmission resulting in high-quality viewing. Every surface of every element is fully coated minimizing internal glare and flare and giving a bright clear view. Unique Uni-body design enhances durability by locking objective lenses in a single housing and synchronizing the eyepiece movement. This minimizes moving parts and assures these binoculars will function properly and clearly for years to come. Aspherical lens elements, which are critical in compact binoculars, provide exceptional edge-to-edge sharpness. This as|No other binoculars like them on the market!|Ideally suited for viewing insects, birds, artwork or any other object at close ranges|Tough rubber covered exterior provides a sure grip and protects the internal mechanisms|C.L.O.S.E. (Convergent Lens Optical System Engineering) allows them to focus down to 1.6 feet|Sleek, contemporary ultra-compact body with unibody construction|Revolutionary dual-axis, single body housing with synchronized eye-piece adjustment to assure correct optical alignment for comfortable viewing|Fast and easy center focusing for handling ease|Helicoid eyepiece rings for extra viewing comfort|Fully multi-coated optics to eliminate harmful ultraviolet rays while ensuring maximum light transmission, resulting in high-quality viewing. Every surface of every element is fully coated, minimizing internal glare and flare and giving a bright clea|High quality BaK4 Porro prisms transmit more light at the edges to enhance illumination for easier viewing in dim light"