Hi,
I use Canon EOS 6D to take astrophotos. I have always like the Canon's internal temperature sensor at tag E47. Gives the temperature of the camera body in degrees Celsius. With that I can rename my image files and have the temperature as a part of the filename. When calibrating with darks I can get a much better match in temperature.

I do it like this with Irfanview when I rename the filenames:
www.astrofriend.eu/astronomy/tutorials/t...rame-dslr-canon.html

But I have noticed something strange. Earlier I had a Windows astroserver that controlled the camera with APT software. Then I normally got a temperature about 6 degrees higher than the sourounding temperature. Now when I the last 2 year use KStar/Ekos the temperature is about 10 to 16 degrees higher than the sourunding temperature.