Originally posted by Lowell Goudge I think you will find that the thermal management in the camera is pretty good, BUT I am not discusssing the heating during an exposure, which I am sure pentax and all other manufacturers are managing correctly. I am discussing the difference between your camera taking a shot at -30C as opposed to +50C.
Yes, I understand what you are saying.
But I was correcting what you stated about the EXIF temperature representing the CMOS sensor's actual temperature. I found no evidence to support this. In fact, later tests continued to support my original conclusion.
Believe me, a long exposure will raise the CMOS imaging sensor's temperature above the ambient temperature but the EXIF temperature recorded always showed little or no change. The only way I could achieve significantly lower or higher EXIF temperatures was by externally heating or cooling the camera.
Again, these experiments provided good evidence that the EXIF temperature is actually a measure of the camera's ambient body temperature.