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Bi-Convex Double Convex Glass Lens K9 N-Bk7 Custom Coating for Optical Instruments, Find Details and Price about Aspherical Lens Plano Convex Lens from Bi-Convex Double Convex Glass Lens K9 N-Bk7 Custom Coating for Optical Instruments - Hanzhong Borisun Optics Co., Ltd.