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"Brighter Images, Porro K9 prisms, Ruby Red filtering coating, Autofocus, Easy to use, Shock Resistant. Technical Specifications Magnification: 7X Lens Diameter: 50mm Angle of Vision: 6.2o Exit Pupil: 7,1mm Eye Relief: 10mm Focus: Auto-focus Prism Type: Porro K9 Field of View: 133@1000m Lens Coating: Fully coated Housing: Rubber Weight: 750gr Dimensions: 6,5x19x20cm"