Internal flexure of Sofi cold structure with objective LF measured at 24 positions. 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 0.95 pixels peak to peak at the detector or 51.16 mm at telescope focus pointing opposite to direction of gravity. Internal flexure of Sofi objective SF and focal elongator measured at 24 positions.
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 4.26 pixels peak to peak at the detector or 57.25 mm at telescope focus pointing normal to 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.