Quote:
Originally Posted by glend
You do need to put a temp sensor on, or as close to as possible, the sensor. Never rely on the RAW image header temp data, as that is recorded inside the camera processor not at the sensor.
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Just like any electronic device, the thermal sensor is a small electronic component and usually gets soldered onto the board as close to the heat source as possible and rarely touching. Like a computer motherboard has one on the board sometimes under or directly next to the cpu. Maybe these days they are built into chips directly that rely on cooling. So don't believe the values themselves they tend to be meaningless. You want to see differential though, so you know the cooling is working at all times. Just turning on your camera itself may negate the cooling effect. Its not about cooling to a target temp so much as displacing the generated heat quickly. Don't forget thermal greases and glues need to be applied particular ways otherwise they become insulators.