Jesse Evans Offline Upload & Sell: On
|
snapsy wrote:
Bad choice of words on my part - I meant a follow-up press release, with the original being the official announcement of the specs, which left out the recording limits. I haven't seen any documented way to trick the camera to bypass the presumed cripple timer - the cardless, HDMI-only case bypasses DIGIC compression entirely, which can plausibly be the reason the recording limits are longer in that scenario (lots of data movement and computation even for ALL-I not to mention h.264/h.265). The cardless scenario also argues against the intentional crippling argument since many professional videographers use external monitors/recorders anyway. Seems improbable Canon would forget that scenario if they meant to intentionally cripple the camera against professional use.
Regarding tricking the camera and helping prove/disprove the timer theory I proposed an experiment to Andrew at EOSHD. I posted about it on dpreview as well here....Show more →
I'm happy to give that a shot. Currently I have my EOS R5 is on its second round of overheating testing in 8k.
Here is what I did for my initial test:
Sat the camera on my desk. A peak design design tripod clip raising it off the surface. Left the display swung out to the left. All power saving features enabled. Display refresh set to power saving / evf would be 60hz but it was inactive anyway.
I just left the camera on the desk recording.
I used a Klein Tools IR10 to take both k type temperature probe readings as well as infrared readings in order to ensure the readings were pretty accurate.
Room Details:
75f ambient temperature with an overhead fan running which would be blowing air on the the R5.
Video settings:
8k / 23.98p / ALL-I
Card:
Sony Tough G CFExpress 512GB
Observations:
Camera started the test at 71f through both k-type probe and ir readings with a 0.95 emissivity rating.
Overheat warning came on at 17:00 - Recorded external temperature of 98.4f.
Video recorded for exactly 20:04 - Recorded external temperature of 98.0f
CFExpress card temperature upon ejection from the camera - Label / Top side: 134f - Bottom side: 92f.
K-Type probe readings from CFExpress slot ~30s after ejecting the card: 128f
CFExpress card temperatures after testing CFExpress slot temps ~30s after initial test - Label / Top side: 91f, Bottom side: 79f.
I failed to act fast enough to get a reasonable temperature from inside of the battery chamber.
I took measurements from around the entire camera body to find the hottest part while recording, the next highest temp area is between the grip and the lens mount at around 93.4f, this matched the left side of the rear panel.
On the left side of the camera the maximum temperature observed was 91f.
After the test, with the battery out and I placed the camera in the freezer after placing it in a ziploc bag which I pressed all of the air out of.
After 25 minutes I took the camera out to see how much time I had to work with on the camera. All tested internal and external surfaces were cooled to a temperature of 53-54f depending on location. The timer read 15:00 which it did during the first test as well.
On this second test, the camera achieved another record time of 20:10. Longer than the first test. And this was with 20 minutes in the freezer.
So, I actually think I have just provided some evidence *against* the idea that Canon is artificially causing a timer to tick down once the camera has overheated.
Edit to add: CFExpress card was only 119f upon being pulled out on the second test, and the interior of the CFExpress slot was ~113f.
|