TSO Polar 10x50 Porro Binocular Black. If you're looking for the best light transmission and clarity reach for the Polar HD. Specifications for TSO Polar 10x50mm Porro Prism Binocular: Manufacturer: TSO Color: Black Magnification: 10 x Objective Lens Diameter: 50 mm Prism System: Porro Prism Material: BK-7 Eye Relief: 12 mm Exit Pupil: 5 in Field of View Linear: 360 ft at 1000 yds Field of View Angle: 6.8 degrees Binoculars Focus System: Manually Adjustable Interpupillary Distance: 56 - 72 mm Close Focus: 26.2 ft Weight: 29 oz Fabric/Material: Rubber Width: 7.7 in Package Contents: TSO Polar 10x50 Porro Binocular TSO T113001: Polar 10x50 Porro Binocular Black