I have a QSI 532 that I acquired, used, and used for some months. Then, on one occasion, after the temperature had been falling as you would expect upon initialization, the reported temp suddenly reversed and started climbing while the cooler was still reporting 100%. ?I contacted support and was told I could send it in for review, but finding a 683 on the market did not pursue it. ?Now I have a potential use for the camera, and in the meantime, I think I saw this same thing happen once with the 683, which works fine and is still in use. ?I suspect that this occurred in the late afternoon in a hot observatory building, and I wonder if there is some potential explanation for this related to those conditions that explain the problem. ?I would send it in for repair if that is needed. ?My astronomy club has a joint venture with a local university for a robotic photometry system, and the grant-funded AC2020 S-Big camera has been a two-year-long nightmare. ?The chip in this and the 683 are really well-suited for photometry. ?There is nothing on the market quite as good these days short of a significant 5 figure budget.?
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Bruce McMath