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The Canon EOS R5 overheats when shooting 8K… AND when shooting 4K

The Canon EOS R5 overheats when shooting 8K… AND when shooting 4K
(Image credit: CVP)

We already knew that the new Canon EOS R5 is limited by overheating in its 8K video mode. However, Canon has confirmed that overheating also affects the recording durations when filming 4K video – all the way down to 4K 30p. 

The manufacturer was very up-front about the overheating limits in 8K video, and we know that the Canon EOS R5 will record about 20 minutes of 8K before it needs to shut down. 

The limits imposed by overheating were made less clear when it came to other recording modes, however, and they are coming as a bit of a shock to many consumers who were expecting – albeit unrealistically – that things like 4K 120fps would not cause the camera to heat up. 

Professional camera specialist CVP was briefed by Canon on the recording limits of each video mode caused by overheating. This was explained in CVP's detailed breakdown of the R5 specs, and Canon followed up by providing further information to the company's tech advisor, Jake Ratcliffe. 

The recording limitations are as follows:

Movie recording size / formatMax recording at 23°C (73.4F)
8K RAW 30p20 minutes
8K 30p20 minutes
4K 120p15 minutes
4K 60p (uncropped)35 minutes (29m59s + second 5m video)
4K 60p (cropped) 5.1K oversampling25 minutes
4K 30p high quality 8.2K oversampling30 minutes
4K 30pNot limited by heat

So, what actually happens when the R5 overheats? The camera shuts off and requires a cooldown period before it can resume shooting video. CVP's breakdown detailed the amount of 'recovery time' required once the camera has overheated, and the amount of recording that is possible afterwards:

Movie recording sizeRecording format standby time (power off)Recordable time (max / approx)
8K 30p10 minutes3 minutes
20 minutes8 minutes
4K 60p (uncropped)10 minutes10 minutes

So, to take the top example, if you shoot an 8K 30p video for 20 minutes the camera will overheat and shut down. If you leave the camera turned off for 10 minutes, you will be able to turn it back on and shoot a further 3 minutes of video; obviously, if you leave it turned off for longer (and thus allow the camera to cool more), you will be able to shoot more video.

Some may view these limitations as a bit of a sting in the tail, and some critics are suggesting that Canon mis-sold the R5's capabilities – even going as far as to say that these limitations mean it is not a professional-grade camera.

Of course, Canon was clear from the beginning that the EOS R5 is intended to be a secondary camera that would pair in a professional environment with the  Canon EOS C300 Mark III cinema camera. And indeed, as a B camera, these limitations really aren't a deal-breaker; 20-minute takes are rare for primary (A) cameras, and changing set-ups often takes more than 10 or 20 minutes. 

Still, the important thing is that this information is out there and available prior to the camera's actual release – which is more than could be said for other manufacturers, who said nothing of the 4K overheating issues in their own cameras until they were literally shutting down in the hands of reviewers…

Pre-order the Canon EOS R5 from B&H (USA)
Pre-order the Canon EOS R5 from Adorama (USA)
Pre-order the Canon EOS R5 from Park Cameras (UK)
Pre-order the Canon EOS R5 from Wex Photo Video (UK)
Pre-order the Canon EOS R5 from Canon Australia

Read more: 

Canon EOS R5 review
Canon EOS R6 review
The best 4K camera for filmmaking for photographers, vloggers, pros

  • DaveHaynie
    Yikes!

    Well, everyone was pretty much expecting a bunch of "fine print and asterisks" when the specs of the R5 came out. So in that, no one's disappointed!

    As an electronics engineer, I saw Canon's limitations as basically one of their level of chip technology versus Sony and some of the others. No IBIS? That's a heat problem and sensor technology-node problem (the tech node has a good deal to say about heat). 4K cropped video? That's a heat problem, a sensor technology-node problem, and/or a CPU/ISP performance limitation (which is also a tech-node problem if Canon's making their own DIGIC processors... I think TI made the older ones, not sure about the current chips). Lower dynamic range? That's a sensor technology-node problem.

    I'll be the first to claim I'd rather have the capability -- with limits -- than have Canon lock out that capability. But I'm also a bit sad that Canon didn't come roaring back with all of their tech issues resolved.
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