Marathon 10x50mm BAK-4 Prism Binocular

The unique focus-free optical design of this model allows the operator to achieve a perfect field of view at most viewing distances, without the adjustment of focus knobs or diopter rings. The default focus distance setting is 70 feet (dependent on the user’s eyesight). Engineered with a premium BAK-4 prism, it offers an excellent viewing experience with superior light transmission and less peripheral light being lost due to internal reflection. Specifications for Marathon 10x50mm BAK-4 Prism Binocular: Manufacturer: Marathon Color: Black Magnification: 10 x Objective Lens Diameter: 50 mm Prism Material: BAK-4 Eye Relief: 0.7 in Exit Pupil: 7.1 mm Field of View, Linear: 342 ft at 1000 yds Optical Coating: Fully Coated Binoculars Focus System: Fixed/No Focus Weight: 1.5 lb Package Type: Box Package Contents: Marathon 10x50mm BAK-4 Prism Binocular