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CCD ice sublimation on cold cameras. Is this a known phenomenon in Astro Photography or am I making it all up? I've had my SX H18 (shutter behind the window) for about 5 years now and remember first time I used it in anger, there were circular patterns and ripples on it that slowly disappeared with each image taken. This has happened several times over the years. I originally thought it was light leakage or similar. Some times they appear on a few images in the middle of a run. Last night after a run on M31, I turned off the cooling before bed. This morning I turned on the cooling to take some flats and the curves and ripples came back as the camera dropped to negative temperatures. Turn off the cooling and away they went. On again and back they came.... So I left the camera busy without cooling to “dry” it out for an hour or 2. Turning on the cooling brought back the ice. Then remembering the first time, I left the cooling on and sure enough the “ice” slowly disappeared. A Google did not find much on ice in ccds but ice sublimation is a well known effect. So I now think I understand what is going on and and wanted to hear if this is a common occurrence or not and am I witnessing the rapid sublimation of the ice as the temperature drops below -10C? This hobby has so many thing to learn!