Rolling shutter analysis: Canon EOS R6 vs Canon EOS R7

[@Brillig2]

We're trying to figure out if the shutter goes from top to bottom, or bottom to top. I thought I could get the answer from this video, but you don't state which direction the camera is going relative to the subject.

[@tenminutetech]

Hi there, good question, sorry I missed that in the original video. I have exchanged both the R6 and R7 for the R6mk2, which has a much faster shutter, about double the speed, so it's a little more difficult to tell. Based on the direction that I rotated the camera, the images generated appear to be drawn from the top to bottom. That said, I'm pretty sure the the sensor is actually upside down in the camera relative to the image that we see on the screen (because it needs to immitate the mirror system of older DLSRs to make the lenses interchangable), so while the bottom of the image is drawn first it's the top of the physical sensor. 99% sure Here's a correction. I was not fully correct in the original comment. I tested this directly with the R6mk2. Rotating CCW matches the slope that I got in this video. If you rotate in that direction, you should expect to see more of the 'stuff' on the left hand side of the image to be visible later in the image capture. This appears to correlate to the bottom of the image. It's a little bit counter-intuitive if you just think of the direction of the slope. I confirmed that the image is indeed flipped in the lens (get a big aperture lens and look through it yourself) so the bottom of the image corresponds to the top of the sensor, which is read last. If everything is oriented like I described, the bottom of the physical sensor starts first (top of the image) and rolls to the top of the sensor (bottom of the image) last. Hope this helps!

[@Brillig2]

@@tenminutetech Apparently, the readout goes in one direction for mechanical shutter and in the opposite direction for electronic shutter for Canon cameras, according to a discussion on dpreview.

[@tenminutetech]

@@Brillig2 Oh yeah, using the shutter actually does change things. Electronic 1st curtain (which is the mode I use most) would start from the bottom like electronic shutter, but the full mechanical shutter would be top down (the slit moving down) since it doesn't make sense to drop the 1st curtain back down first, since it's already up. For what it's worth the full mechanical shutter isn't great in the R7 and induced too much shutter shock for my taste, so never really used it.

[@davideisner8881]

Thanks for a really clear exposition! As a European, I still find it odd to see inches (rather than cm) used in a scientific lecture!

[@tenminutetech]

Ha! Thanks for taking a look. I used inches because that's how I initially made the measurement, but you're right that metrics would be better suited for this kind of content. In the future i'll stick to just metrics! Thanks!

[@primaandika7404]

Amazing calculate. You Like A professor.

[@tenminutetech]

Thanks!

[@Rajupkd]

Nice ! So do you think the FF user would be happy using R7 in any situation ? I mean general, landscape or Birding ? Or better to stick with R6 or so .... ?

[@tenminutetech]

Hi, and thanks for the comment. I think the R7 is pretty great and I shoot mostly birds in aviation photography. The features and auto focus are superior to the R6 and I prefer the button layout. However, the electronic shutter in many cases is almost unusable in my opinion when handheld. The readout speed is just too slow and picks up and wobble or camera shake pretty significantly. The best compromise is to stick to electronic first curtain pretty much all of the time, unless you're on a tripod where the electronic shutter might be okay. Outside of that what you get for the R7 is great in comparison to the R6. In pretty much every way it's a better camera other than not being full frame, so if you really need the low light performance then the R6 is maybe the marginally better choice.

[@juliensimracer]

thanks, so for video of weddings, go r6 (mkII should be even beter)?

[@tenminutetech]

Sorry for not seeing this comment sooner! I think the R6 mk2 should be better because it has a little better tolerance for heating but it *does* still overheat. I purchased the R6 myself and can confirm that it overheats in 4k60 still.

[@thanoskaza]

@@tenminutetech is it overheat at 4K60 10BIT 422 when shooting 5 minutes video, pause for 1-2 minutes and back on record? For 2 hours work

[@Shoxart]

First time i see someone make math in photo review! Rolling shutter problem in this R7 is not acceptable.

[@Slic3dResearch]

Thanks! I wanted to find a way to quantify the rolling shutter since I don't have access to the actual hardware to know how fast the sensor read-out is, or what that number would even mean. Hopefully this made sense, and if you had any other ideas for better ways to test this let me know! I agree on the R7, I've pretty much only have been using my R6ii because of this, the slow buffer, and the weirdly random out of focus shots (has to to with poor compute power, cant keep up with tracking requirements in burst)

[@denisv6272]

Hi, does it bring anything to switch from 30 to 15 FPS ???

[@tenminutetech]

Hello. I tested this and switching the burst rate doesn't change the actual scanrate of the sensor.

[@원기연-i5t]

crazy man

[@SMGJohn]

Basically the Fujifilm XH-2s is better as its got same rolling shutter as a Sony A7sIII which is about 8ms, the R7 has about 30ms and the R6 has about 32ms LOL