Pentax U-Series Compact Porro-Prism UP 10x21 Binocular Black. These Binoculars from the designers at Pentax feature fully-multi-coated optics for minimal glare and sharpness. With aspherical lens elements the Pentax Compact UP Binocular provides edge-to-edge brightness in low or harsh lighting situations. Affordable and practical the Pentax U-Series Binocular is perfect for all of your field glass needs. Specifications for Pentax U-Series Compact UP 10x21 Binocular: Manufacturer: Pentax Magnification: 10 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 Magnification Type: Fixed Width: 110 mm Features of Pentax U-Series Compact UP 10x21 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 10x21 Binocular Pentax 61804: U-Series Compact Porro-Prism UP 10x21 Binocular Black