Pentax U-Series Compact Porro-Prism UP 8x21 Binocular Black. Whether you use it for indoor or outdoor events you will be pleasantly surprised by the clarity and sharpness of the image and surprisingly affordable too. These compact inverted porro-prism models feature a durable dual-axis single body design with synchronized IPD adjustment and full multi-coating for better light transmission. Aspherical lens elements give you edge-to-edge sharpness. They are a perfect utility companion for a multitude of applications. Specifications for Pentax U-Series Compact UP 8x21 Binocular: Manufacturer: Pentax Magnification: 8 x Objective Lens Diameter: 21 mm Prism System: Porro Eye Relief: 13 mm Exit Pupil: 2.6 mm Field of View Linear: 108 m at 1000 m Field of View Angle: 6.2 degrees Binoculars Focus System: Center Focus Water Resistance Level: Waterproof Length: 83 mm Weight: 7.4 oz Condition: New Magnification Type: Fixed Width: 110 mm Features of Pentax U-Series Compact UP 8x21 Binocular New fully multi-coated optics Inverted porro prism design Aspherical eyepiece lens elements Dual-axis single body design with synchronised IPD adjustment Protective rubber housing Pull-up eyecups Light weight and compact Package Contents: Pentax U-Series Compact UP 8x21 Binocular Pentax 61801: U-Series Compact Porro-Prism UP 8x21 Binocular Black