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3-5 Wavelength Germanium Lens Focal Length 70mm F2.0 Mwir Cooled Infrared Manual Focus Optical Chalcogen Lens for 640X512-15um Detector, Find Details and Price about Infrared Germanium Lens Manual Focusing Infrared Lens from 3-5 Wavelength Germanium Lens Focal Length 70mm F2.0 Mwir Cooled Infrared Manual Focus Optical Chalcogen Lens for 640X512-15um Detector - Nanjing Rising Opto-Electronic (S) Co., Ltd.