Pentax UD 9 X 21mm Black Compact Roof Prism Binoculars Green Medium. Its compact easy-to-hold body assures outstanding portability in a wide range of applications from nature observation to the viewing of sports concerts and theatrical performances. Bright clear viewing Thanks to the incorporation of multi-coated optics designed to eliminate excessive reflection the PENTAX UD series delivers a bright clear view of the subject free of flare and ghost images. The PENTAX UD 9X21 features fully multi-coated optics a multi-layer coating applied to all reflective lens surfaces to assure an especially bright view of the subject. The PENTAX UD 10X21 has a single multi-coated lens while other lenses are treated with a single-layer coating. Specifications for Pentax UD 9 X 21mm Black Compact Roof Prism Binoculars: Manufacturer: Pentax Magnification: 9 x Objective Lens Diameter: 21 mm Eye Relief: 9.9 mm Exit Pupil: 2.3 mm Field of View Linear: 105 m at 1000 m Field of View Angle: 6 degrees Weight: 6.9 oz Magnification Type: Fixed Features of Pentax UD 9 X 21mm Black Compact Roof Prism Binoculars A minimum focusing distance of approximately three meters for a sharp view of close-range subjects Nonslip diopter rings for easy error-free diopter adjustment Use optional TP-3 tripod adapter to use binoculars with a tripod Package Contents: Pentax UD 9 X 21mm Black Compact Roof Prism Binoculars Pentax 61813: UD 9 X 21mm Black Compact Roof Prism Binoculars Green Medium