77mm Infrared IR Filter 680nm 1.made of oxidated aluminum/optical glass 2.wavelength 680nm 720nm 850nm 3.black color Camera Accessories Stppo 77mm Infrared Infra-Red IR Filter 680nm Feature1.Ring Material: Black Matte Oxidated Aluminum2.Glass Material: High Intensity, Optical Glass3.Diameters: 25,27,28,30,30.5,37,43, 46, 49, 52, 55, 58, 62, 67, 72, 77mm4.Unique display color box and double ...