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Just a note that the temperature reported by the DSLR is NOT the sensor temperature (most likely).
Few of us messed with the cold-finger cooling of the older Canon DLSRs (450D) and got the CCD sensor to sub-zero temperatures (measured by a separate temperature sensor). The temperature reported by the camera was not related to this temperature and, from memory, was always above the ambient temperature.
The conclusion was that the temperature reported by the camera is coming from a temperature sensor on one of the PCBs and not the CCD sensor.
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