Profile: DFM Engineering, Inc. specializes in manufacturing computer controlled astronomical telescopes and instruments. Our products include telescopes & systems, instrumentation, optical systems and lidar components. Our telescopes & systems include custom telescopes, telescope control systems and telescope mounts. We provide 40 cm telescope for a balloon borne experiment. This telescope used invar spacers to minimize focus shift with temperature and had special mirror supports to allow the telescope to look below the horizon.