Vixen 10x50 Ascot Super Wide CFW Weather Resistant Porro Prism Binocular with 8.5 Degree Angle of View BAK4 porro prisms provide enhanced clarity Multicoated optics for enhanced light transmission, excellent color, maximum sharpness Tripod adaptable for comfortable long-term viewing - standard 1/4"-20 mount Centered focus knob is intuitive to use and very accurate