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K9/N-Bk7 Material Focal Length 65mm Optical Glass Hemisphere Spheric Half Dome Lens, Find Details and Price about Optical Glass Hemisphere Spheric Half Dome Lens High Quality Bk7 20mm Half Dome Lens from K9/N-Bk7 Material Focal Length 65mm Optical Glass Hemisphere Spheric Half Dome Lens - DG Optoelectronics Co., Limited