CFexpress card runs HOT...like REALLY REALLY hot that you can't even hold it hot

gavin wrote:

Read the Lens Rental R5 thermal imaging article. The hottest part is the CFe.

There are many "hottest part" at issue here in the article if it is read carefully as have and will explain. The lens rental story does state "The hottest spot in the camera, though, was clearly the CFx slot. After the card was ejected it was about 48°C."

You are partially corrent in that elsewhere later in the article we learn "The CFx card slot was at 57°C and the internal temperature sensor at 61° C when things shut down."

However it is reasonable the temperature sensor source the EXIF data is presumably referring to the hottest spot mentioned in the article and it is at the temperature sensor which is at a location not known outside of Canon precisely but there has been plenty unconfirmed speculation as to it's location.

I suspect the temperature sensor may be close to the hottest spot which actually on the circuit board not too far from the temperature sensor.

The article mentions three different "hottest part".

The first was the statement: "The hottest part of the camera was the back behind the LCD door (43°C / 109°F), followed by the rear body around the command/set dials and the area of the grip where you rest your thumb (40°C / 104°F)."

The second was the statement "The hottest spot in the camera, though, was clearly the CFx slot. After the card was ejected it was about 48°C."

The third was the statement " The camera is hotter deep inside (the temperature sensor) than at the hottest exit points."

For the purpose of evaluating mitigating strategies to accelerate the heat exit transfer rate I chose the first stat the hotter part of the camera which is the only one of the three hot locations above that is fully on the exterior of the camera and the back behind the LCD has a large surface area attractive for facilitating large amounts of heat transfer. The CFE card is 5°C warmer which would be better for hear transfer but it's surface area is small and not easily assemble from it's mounted location inside the camera and behind a latched door.