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D 25mm F -25.4mm Flat Plano Concave Lens K9 N-Bk7 Custom Coated Optical Glass Lenses, Find Details and Price about Aspherical Lens Focus Lens from D 25mm F -25.4mm Flat Plano Concave Lens K9 N-Bk7 Custom Coated Optical Glass Lenses - Hanzhong Borisun Optics Co., Ltd.