Pentax 8.5 X 21 Papilio Binocular 62216

Named for 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. No other binoculars like them on the market C.L.O.S.E. (Convergent Lens Optical System Engineering) allows minimum focusing distance of 1.6 feet. Ideally suited for viewing birds, insects, flowers, artwork / printed materials or any other object at close range Revolutionary dual-axis, single body housing with synchronized eyepiece adjustment to assure correct optical alignment for comfortable viewing High-quality BaK4 prisms for maximum light transmission and illumination Fully multi-coated optics reduce glare and harmful UV rays while providing maximum light transmission and color quality Fast and easy adjusting center focusing for handling ease Tough rubber housing improves grip and shock resistance Helicoid eyepiece rings for extra viewing comfort Binocular Type: Center focusing, porro-prism Lens Construction: 2 elements in 1 group; Eyepiece Lens: 5 elements in 5 groups Magnification: 8.5X Objective Lens Diameter: 21mm Real Field of View: 6.0 degrees Apparent Field of View: 51 degrees Field of View at 1000m: 105m Field of View at 1000 Yards: 315' Exit Pupil: 2.5mm Eye Relief: 15mm Prism: Porro Relative Brightness: 6.3 Diopter Adjustment Range: +/- 4m -1 Diopter Adjustment: Click-stop adjuster built in right eyepiece Eye Distance Adjustment Range: 56mm - 74mm (2.2" - 2.9") Focusing Range: Approx. 0.5m (1.6') to infinity Eyepiece Ring: Helicoid Type Body Color: Black & dark gray Height & Width: 116mm x 110mm (4.6" - 4.3") Thickness: 55mm (2.2") Weight: 290g (10.2 oz.) Accessories: Eyepiece lens caps, Case, Neck strap Vergence Correction: Focus-coupled correction mechanism