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Mini 1-10mm F2-18mm Optical Glass Lens Bk7 K9l Laser Ar 400-700nm Coating Lenses, Find Details and Price about Bk7 Focus Lens Optical Lens from Mini 1-10mm F2-18mm Optical Glass Lens Bk7 K9l Laser Ar 400-700nm Coating Lenses - Changchun Juncheng Optical Instrument Co., Ltd.