R5: Rolling Shutter & Overheating

Slashcam just published their rolling shutter test results for the R5 and they’re pretty remarkable. Here’s the skinny if you don’t have time to pore over the whole text: the rolling shutter is kind of sensational, much better than they would have expected from the very first 8K mirrorless camera, and uncommon for any full frame hybrid video camera, period. If Canon were able to slow down the read times of the sensor, it should be possible to reduce heating (although that would increase rolling shutter).

I used Google Translate, so pardon the weird English!

Let’s start with the 8K mode: Both in the complex, full DCI 8K sensor readout and in the slightly horizontally cropped 8K UHD mode, the image is read out consistently with almost exactly 16ms. This is a surprisingly good value that we would not have expected from the first 8K DSLM. Since this model cannot handle 50 / 60p in 8K, Canon could have “taken its time” for a frame up to 32ms (which Canon and Sony did in almost every earlier DSLR). Or to put it another way: apart from the signal processor and the thermal limitations of the housing, this sensor with its 16ms is probably able to be read out in principle with 50 or 60 fps in 8K. The sensor can therefore very likely do more than the rest of the camera currently allows. 4K Consequently, it is not surprising that the R5 also has a rolling shutter of 16ms in 4K HQ mode. In this mode, the full sensor readout in the camera is properly scaled down to 4K. Since this uses the same 8K readout, there are probably not 50 or more images per second in this mode. If you use the 4K modes with the EOS R5 without the “HQ” suffix, the camera reads the sensor with a quick 10 ms. And consistently from 24-60fps. The rolling shutter time even drops to 8ms (up to 120 fps). This is an overly clear indication that not every sensor of the full 8K sensor readout is used in these 4K modes. As a result, binning or something similar should be used here.

HD Strangely enough, no frame rates over 60 fps are available in FullHD and the rolling shutter is 10 ms without exception. In most cases, it should be qualitatively more productive to film in 4K and then downscale the material in the post to FullHD. Conclusion All these values ​​suggest that the sensor on the Canon EOS R5 is not being operated at its limit, because the rolling shutter behavior of the camera is fundamentally better than one would expect from the first 8K DSLM on the market. 16-10ms is a good standard for cinema applications and is not yet very common in hybrid photo / video devices with full-frame sensors. At the same time, Canon would still have leeway to read the sensor more slowly in critical cases and thus perhaps to ensure less heat in the housing. On the other hand, many users are unlikely to be thrown back into old wobble times. How these rolling shutter values ​​actually affect the image, we will clarify shortly in another article ..

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