Thanks for this. I'm hoping the next EOS M camera has an electronic shutter mode that can capture something like 20 fps. We shall see hopefully at the end of this month.
I'm not aware of any interchanable-lens digital camera that uses a fully electronic shutter for still imaging. However, for video these cameras have to use an electronic shutter since the mechanical shutters (at the focal plane) can't really operate reliably at the frame rates that are needed for video.
The main reason why still cameras continue to use mechanical shutters is that today's CMOS cameras get somewhat better image quality when the exposure is both started and stopped under total darkness (as happens with a mechanical shutter). Also, fully electronic shutters can cause blurring in the image (the "jello" or rolling shutter effect you sometimes see in video captures when the subject is in motion during the capture).
Mirrorless cameras that offer a first-curtain electronic shutter mode are somewhat of a compromise, they probably sacrifice a small amount of image quality to reduce the shutter "bounce" you may get when you have to close and then reopen the shutter to begin the actual exposure, but the exposure is still ended using the mechanical shutter as the latter still offers improved image quality. Another reason for the first-curtain electronic shutter is that it reduces the number of activations that are required by the mechanical shutter (meaning a longer life for the shutter).
With a mirroless camera that is using its liveview for framing prior to the capture of an image the mechanical shutter actually has to close and then reopen to begin the exposure (that's two activations of the shutter), then it has to close to end the exposure and reopen yet again to restore the liveview image. So, you have four activations of the shutter.
However, with a first-curtain electronic shutter you don't need the first two activations, since the exposure begins without using the mechanical shutter.
In any case, as I mentioned earlier I don't think that the lack of an electron shutter mode for still captures is the primary reason for you blurred images, so I wouldn't be overly concerned about this APPARENT shortcoming with the Canon M6 (you may want to check further, because the M6 may offer this feature, I just couldn't find any mention of it in the user manual).
Edited by james7ca, 17 August 2019 - 10:45 PM.