a cooled stray light baffle for use in an imaging system such as an infrared camera is disclosed . the baffle includes a tapered shroud portion which is shaped to just enclose the envelope of light rays which pass through the baffle . that is , space between the envelope of light rays and the inner surface of the baffle is minimized . this results in minimization of the overall surface area and mass of the baffle , which in turn results in a minimization of the refrigeration load of the system . the lower refrigeration load requires a smaller refrigerator which results in reduced system size , power consumption , vibration , cool - down time and cost of operation . the outer surface of the baffle is covered with a reflective material to reflect light photons . the inner surface is roughened and blackened to absorb stray light photons which enter the baffle .