When the R5 was released, we also learned that it overheats quickly
in 8K shooting and in some 4K modes. Initially this was handled through a
timer chip in the camera independent of actual temperature. After public
backlash, Canon quickly released a new firmware that patched the timer
issue and started actually using the camera temperature data instead,
but even with this upgrade the performance boost was minor, for example
at 20C instead of overheating after around 19 minutes, the new firmware
allowed you to shoot around 25 minutes, and the recovery after
In several thermal analyses of the camera, the processor on the
motherboard seemed to generate most of the heat. In the stock design,
Canon places two thermal pads partially over the processor and pumps the
heat into a small heatsink. That heatsink however sits under another
board and does not vent heat anywhere further.
To remedy this problem, we took an R5 apart and designed a new
heatsink to vent the heat from the processor to the camera case where it
could dissipate faster. We tested aluminum initially, but eventually
settled on a thick copper heatsink to transfer heat more efficiently.
This design draws heat out of the processor and brings it around the motherboard and out to the rear case where it transfers heat through a high efficiency thermal pad. This design is fully internal to the camera and maintains the weather sealing of the camera.
We tested the modified camera at 8K-D IPB 30FPS at 59F (15C) and 69F
(20C). At 15C, the R5 never overheated in our hands. At 20C, where the
stock camera last around 25 minutes, after our mod the camera lasts 44
minutes, almost two times the initial shooting duration. What’s even
more important, is that the camera recovered a lot faster after it did
overheat, giving more shooting time after a short recovery. With the
stock camera, we could only get about 8 minutes of additional shooting
after a 5 minute recovery, where the mod was able to shoot 25 minutes
after the same 5 minute recovery, a 3 times faster overheating recovery.
While we have seen these improvements with most camera setups, we have noticed that this modification’s performance can be negatively impacted by certain external devices and CF Express memory cards. Our tests were conducted and our results recorded using Sony Tough CF Express cards, unfortunately, we have found that ProGrade CF Express cards can cause greatly decreased heat dissipation performance. We have not tested other cards yet but be cautious if using card brands other than Sony. Additionally, while we have tested a number of camera setups we have found some variation in the performance based on the use of certain external devices and other parameters.
Shop the EF-RF Drop-in Filter System
Shop Kolari R Series Clip-in Sensor Filters
By purchasing you agree to our Terms of Purchase
Michael Zoradi (verified owner) –
I ordered one of the first of these Coolings Mods and got my R5 back a few days ago… Overall I am extremely impressed! First of all, Kolari Vision was very easy to work with. Always got prompt responses to my emails and one time when I called them a human picked up the phone (no phone tree) and super helpful.
In regards to the mod itself… I haven’t run any scientific tests but I’m been shooting 8K for about 10 months with my R5 and I have a clear understanding of how long before it overheats. I used my R5 extensively this past weekend (in 90 degree weather) and while shooting clips of 8K off and on for about 2 hours the camera never once even got close to overheating. When shooting 8K it always says on the LCD “15 min remaining” and the lowest it ever got (with the cooling mod) was “10 min remaining”. For context, in my experience, based on how I shoot in similar weather it would have gotten down to around “2-3 min remaining” in similar conditions. This gets a big thumbs up from me as I’ll take ANY improvement when it comes to shooting times for this camera.
Greg Law (verified owner) –
I 2nd the review above. IMO this R5 heat mod is a must for high end R5 videographers. So far no overheating in conditions that were a problem without this heat mod. My unmodified R5 would overheat just watching & waiting for an eagle to fly so i had to watch in photo mode and switch to video mode missing the beginning of the flight. Not anymore. I left the camera on to the battery exhausted and had no overheating this alone is worth the price IMO. I rarely film in 90+ high humidity as raptor active is so reduced. If it ever overheats the faster recovery time noted in the above review will be much appreciated. I can highly recommend this R5 heat mod upgrade. The staff & customer service is excellent too ! Well done Kolari Vision