Back when the Canon EOS R5 was first released and the rumours of overheating first came to light, one of the first companies to jump on the camera cooling train were Tilta, announcing a cooling kit for the EOS R5 & R6 that mounted onto the back of the camera when the LCD was flipped out. The problem was, the EOS R5 firmware was on a timer. It wasn’t temperature-dependent. So it didn’t really work.
Over a couple of firmware updates, things changed and now the EOS R5 (and EOS R6) does monitors the temperature, as proven by Matt Perks’ DIY cooling attempt. This makes Tilta’s $165 camera cooling product, first announced in July 2020, finally, potentially viable. So, now it’s actually being released and it’s compatible with both cameras.