Pentax Papilio III WR 8.5x21mm Porro Prism Binocular Olive. Specifications for Pentax Papilio III WR 8.5x21mm Porro Prism Binocular: Manufacturer: Pentax Magnification: 8.5 x Objective Lens Diameter: 21 mm Prism System: Porro Prism Material: BAK4 Eye Relief: 15 mm Exit Pupil: 2.5 mm Field of View Linear: 105 m at 1000 m Optical Coating: Multi-Coated Binoculars Focus System: Manually Adjustable Interpupillary Distance: 56 - 74 mm Close Focus: 0.5 m Weather Resistance: Impact Resistant Length: 116 mm Weight: 295 g 290 g Finish: Rubber Coated Width: 110 mm Features of Pentax Papilio III WR 8.5x21mm Porro Prism Binocular Close-distance observation from a minimum focusing distance of approximately 50cm: In general observing an object from a close distance with a pair of binoculars causes a discrepancy in the visual field between the right and left eye. To compensate for this discrepancy the Papilio III WR incorporates the PENTAX-original convergence correction mechanism which slides the objective lenses in conjunction with the focusing distance. This unique mechanism lets the user more comfortably observe subjects at close range without suffering eye fatigue. Since the objective lenses return to their original position in long-range observation this model also performs superbly in normal applications such as birdwatching hiking concerts and sports viewing. Weather-Resistant construction: For the first time in the Papilio series the Papilio III WR features a weather-resistant construction which minimizes the intrusion of water and moisture into the interior making it a highly dependable observation tool in the rain and mist and at locations prone to water splashes. An anti-stain coating has also been applied to the eyepieces and front plate-glass surfaces to minimize the adhesion of dust and stains. High-performance optical design: All optical elements of the Papilio III WR are treated with a full multi-coating process to assure the optimum imaging performance while minimizing unwanted reflections. The combination of the aspherical optical elements and the high-refraction BaK4 index glass prisms also deliver a sharp clear subject image without distortion even at the edges of the image field. Latest HD Coating further upgrades optical performance High-performance HD Coating has been applied to some of the optical elements already treated with full multi-coating. Compared with conventional multi-coatings this assures higher transmittance with less reflection. The result is that the Papilio III WR delivers extra-clear higher-contrast images even under such demanding conditions as backlighting. Long eye relief: The Papilio III WRs long 15mm eye relief allows even eyeglass-wearers to observe the entire field of vision clearly and comfortably. Easy-to-hold rubber casing The entire binocular body is encased in a protective rubber casing to assure better holding comfort and superior impact resistance. Dual-axis eye-space adjustment mechanism for simple effortless adjustment of the width between the eyepieces Helicoid-type eyepiece rings for single-action push-and-pull adjustment of eyepiece positions Click-stop diopter adjustment mechanism to prevent accidental shift of the diopter settings Quick-action neck strap with instant attachment and release operations Compatible with Tripod Adapter U allowing for swift effortless installation on a tripod Package Contents: Pentax Papilio III WR 8.5x21mm Porro Prism Binocular Case for Binoculars Papilio Neck Strap for Binoculars x25 UP WP Eye Lens Cap for Papilio Series Pentax 62017: Papilio III WR 8.5x21mm Porro Prism Binocular Olive