... The telescope parts used for focus and pointing: . reflectors, horns, rotary floor, tilt sensors, distomats, tiedowns, temperature sensor, azimuth, zenith angle motion. Focusing the telescope: . Align the panels of each reflector to give the correct curvature. Align each of the reflectors to point along the optic axis. ... The pointing model . ... Calibration : . Focus curves to check focus. heiles calibration scans to measure gain, Tsys, hpbw, coma, sidelobes. ...