And don't forget that Canon could've very well implemented a very large hysteresis, so you'll get different time estimates 'climbing' up the heat mountain than descending it during cooldown.
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69 Mins of 8K from a cooled R5
- Thread starter Jonathan Thill
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And don't forget that Canon could've very well implemented a very large hysteresis, so you'll get different time estimates 'climbing' up the heat mountain than descending it during cooldown.
Yes I think that was also a conclusion on DPR forum and the heat up/ cool down test. Thanks for reminding me...
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Ok... very unscientific as the tests were done on 2 days and although the temp in the appt is broadly the same, I am sure it isn't exactly...I wanted to try and do a couple of tests based around the open door. I have a small 5" fan, and I can lower the appt via air con to 18 deg. I did consider mounting my R5 on my tripod so it sat really close to the aircon unit but decided against that
I am using UHS II cards, and with 8k30 ipb I got 20mins 10s. But I can sit that USB fan in front of the camera, behind the camera (screen open), into the side where the cards are, and the outside of the body certainly gets cool, but the cooldown time remains unchanged. Amusingly I have to put a block behind the fan else it manages to push itself off the table with the blowing so close to the Canon. Battery door is open, no battery, no card etc.
If you check the DP thread, swapping CFE made actually a -ve impact to the record times, which was interesting. I was going to try the 8k30 at 12 mins, and then swap the cards, but waiting 2 hours each time is annoying, and the active cooling of the body seems to make little change to that - leading to the conclusion of others, that the body is perhaps too good at letting external temp affect it, unless you leave it for extended periods at really cold temps (which I am personally not prepared to do).
I am thus leaning towards another conclusion of others I have read outside here, that once you trigger the thermal limit, whatever it is that requires the cooldown isnt perhaps something we are thinking about - the UHS cards are cool, the slots feel cool although I have no temp probe, the screen is cool, yet something insider not cooling down. Which leads me to currently conclude there is a slow dissipatation "component" inside and Canon knows how long this takes to dissipate the heat based on the properties of the body and this "component" takes 2 hours based on calculation to dissipate the heat naturally through the body before it is safe to use again.
Cooling in the fridge slows down the heat build up, perhaps, but once the thermal trigger happens, then the cooling of this component isnt something we can accelerate.
Maybe on Friday I can try 8 minute recordings - I have 3 UHS II 64GB cards - and maybe that is enough to allow me to test it 3 times to see if I can exceed 20 mins. I don't hold much hope, given my limited & non-scientific tests today.
Baseline test 8k30 bit, ipb on UHS 2 -> 20m 10 sec.
Following morning ie today, the 3 UHS II tests
1st test 8min 15s
2nd test 8min 12s
3rd test 3min 26s - shutdown
I set a timer, when I heard it I would go back to the camera, power off, remove battery, remove card, re-insert new card, re-insert battery, power on. Sit camera down, reset timer, hit record...
Interestingly, I only get 11min 30 on the display iirc when I hit record the first time, then 10min the second time.
So now it is sitting there, doors open, 5" fan cooling it
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