R5 recording limits temp/sensor correlations

Started Aug 13, 2020 | Discussions thread
OP Horshack Veteran Member • Posts: 8,722
How about 69 minutes of 8K record time?
19

Hoka has come through again with his extremely generous donation of time with an amazing new experiment. After last night's experiment he put his R5 in the meat drawer of his fridge for 11 hours - the surface temp inside the drawer was 0.4C (ie, just above freezing). After taking it out of the freezer he then repeated yesterday's experiment. Instead of getting only 15 minutes of 8K record time he got 69 minutes!

There is one other significant difference that might prove more interesting than the meat drawer. Yesterday's experiment was with a Sony CFE card. Today's experiment was with a ProGrade card. In today's experiment he actually ran out of space after 60 minutes of recording on the ProGrade, so he then switched to the Sony card. Just before the switch the camera was reporting near 0:00 available video recording time left (thermal indicator, not card space). After he switched from the ProGrade to the Sony the camera immediately jumped up to 15:00, and provided 15 minutes of recording before reaching thermal shutdown.

Another interesting CFE observation is the indicated available video time on the ProGrade is displayed with granularity to the second - for example at the start of the test it showed 24:23 (24 minutes, 23 seconds), whereas the Sony always shows the seconds field of zero (for example, 15:00, 10:00, 05:00). It's very interesting that the precision of the available time left (presumably based exclusively on thermals) would be different for one card vs another. This implies the thermal calculation may be based in part on the CFE interface and specific card, either due to differences in some field the card returns in a CFE/NVMe protocol or even more interesting, based on a thermal element of the card itself. More experiments will need to be performed to investigate this aspect.

In the meantime, here is a new graph (direct link) - this one shows EXIF-reported temp over each sequential 3-minute 8K clip. Yesterdays' graph showed the indicated available recording time left instead. The graph on the left shows yesterday's experiment, at normal camera/ambient temperatures (15 minutes before thermal cutoff). The graph on the right shows today's experiment, performed after removing the camera from freezer overnight (69 minutes before thermal cutoff, and using a different CFE card). Notice the camera started at a much lower temperature base after being in the freezer...and took much longer to heat up.

Click "original size" to view

More analysis of this data set to come...

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MOD Mako2011
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