Significant Motion Blur, Canon R6. Caused by IBIS? Wide angle only.

electronicsenthusiast wrote:

Thanks. Given my response to Karl, can anything be inferred from not seeing this result when shooting on a tripod, both with and without IS?

Could this be that I primarily am using the electronic shutter? I notice most of the errant shots are the first I take in a series.

I suspect I am getting the shot as IS is making a quick and significant shift to correct. I found a chart showing what type of IS is active, depending on focal length and lens capability. Wondering if my wide EF lens and R6 combo is the issue. I saw this much less frequently on the RF lens, and the effect was noticeable, but was different and not as dramatic.

I'm not sure anything below helps, but here are some thoughts:

The "causes a problem only the first shot" reminds me of the topic that resulted in Canon agreeing there was a problem and changing the firmware.  But note that this problem only was known to occur with non-IS lenses. It caused the IS to rotate the image, whereas in your case, it is shifting vertically (in landscape orientation).

SeeL https://www.dpreview.com/forums/post/64972492

Since the above problem was fixed with firmware, it does suggest there is a mechanism to make it happen or go away. There is also a good chance your camera is broken or not communicating properly with the lenses.  One thing, have you tried cleaning all the contacts on your lenses?

Since it is happening with the electronic shutter, it would seem to eliminate any chance of shutter shock.  It would be interesting to see if full mechanical has the same issue. Maybe the electronic shutter is opening before the IBIS has fully kicked in.

Since the blur is worse at the bottom rather than the top, and the image is inverted, it suggests that the IBIS/IS is messing up or not working or restarting when the shutter is pressed when it should be running all the time.