I can say that the K5 - at least in video mode - is VERY sensitive to temperature.
Here in Florida, when the temp is in the 80(f) or higher, the K5 in video standby or live mode has a hard time getting rid of the heat, and the little red thermometer can be seen on the LCD screen.
When I shoot video at less than 80(f), I never seem to have a problem with the temp.
For pictures, I don't think I have ever had any issue.
When it comes to video in the heat, I turn the camera off between takes and come out of video mode quickly.
I also keep my camera out of the sun as much as possible when it's hot out.
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