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Paul I have measured the temperature of the sensor while it is doing continuous long exposures and it is 17C above ambient or fridge temperature. In other words it is the hottest object in the fridge so as long as it is exposing continuously no condensation. I have run the fridge at -20C in winter and had no condensation.
When cooling down I set the camera taking dummy exposures and you can tell when the sensor is at equilibrium when the jpg size straight out of the camera levels out.
I thermostatically control the temperature of the lens barrel or FR in the case of the 100ED to 20C. If I do not do this the lens or FR gets condensation.
If I run the fridge at -10C the sensor is at 7C. At -30C fridge temp the sensor is at -13C.
On a hot summer night this will be very useful.
Bert
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