Inner curve shows movement of point image on detector for one full revolution. Position of closed cycle cooler indicated on rotated squares as seen standing in front of entrance window. Flexure is 1.14 pixels peak to peak at the detector or 30.64 mm at telescope focus. Persistence as function of temperature. Flexure of Sofi objective LF measured at 24 positions.
Inner circle shows movement of point image on detector for one full revolution.
Position of closed cycle cooler indicated on rotated squares as seen standing in front of entrance window. Flexure is 4.0 pixels peak to peak at the detector or 215.43 mm at telescope focus pointing in direction of gravity. Flexure of Sofi objective SF with focal elongator measured at 24 positions. Inner circle shows movement of point image on detector for one full revolution. Position of closed cycle cooler indicated on rotated squares as seen standing in front of entrance window.