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.Features:- Fully multi-coated optics- BaK-4 prisms- Long eye relief- Unique Uni-body designDon'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 assures that items on the edge of your field of view are just as sharp as those in the center.- The UP 8-16x21 Zoom and UP 10x21 and 8x21 models are offered in unique, attractive color options that match your personal style.Specifications:- Product Type: Porro Prism, Center Focus binoculars- Focusing Range: 9.24 feet - infinity- Prism: Porro- Objective Lens Diameter: 21mm- Specifications: 10X- Real Field Of View: 5.0 degrees- Field Of View At 1000m: 87 meters- Binocular Type: Porro Prism- Field Of View At 1000y: 287.1 feet- Exit Pupil: 2.1mm- Eye Relief: 9.5mm- Relative Brightness: 4.4- Eyepiece Ring: Sliding- Body Color: Black- Height Width: 3.14x4.33 inches- Thickness: 1.9 inches- Weight: 7.4 ounces- Waterproof: No- Minimum Focusing Distance: 9.24 feetWhats in the box:- Pentax 8.5x21 U-Series Papilio II Binocular- Eyepiece Covers- Neck Strap- Carrying Case