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Focal Length 6.9mm F1.0 Long Wave 8-14um Chalcogen Infrared Germanium Athermal Lens Thermal Lens for 640X512-17um Detector with Ar Coating, Find Details and Price about Infrared Lens Infrared Chalcogen Lens from Focal Length 6.9mm F1.0 Long Wave 8-14um Chalcogen Infrared Germanium Athermal Lens Thermal Lens for 640X512-17um Detector with Ar Coating - Nanjing Rising Opto-Electronic (S) Co., Ltd.