Hi Bob,

I don't have those cameras, but have been considering one in the not-too-distant future...

My understanding of the "problem" is that it's the first image in a burst that gets blurred by the in-body image stabilization (IBIS). All images after the first seem fine. Now, these are the first two Canon cameras to have IBIS, so there may be some user error involved.... People not being accustomed to using IBIS.

But even if it isn't user error and assuming it's a glitch, the solution seems pretty simple.

For shots like you want to do... Just turn off IBIS and put the camera on a tripod. Even if you don't do that, how often do you shoot waterfalls and streams at 10 or 20 frames per second? Wouldn't you be taking single images, not bursts that fill up your memory card rapidly? As best I can tell, the "problem" only occurs when firing bursts of shots and it's only the first image that might be blurred.

Canon will fix it, you can rest assured. Maybe it will be done with a firmware update. Or maybe they will need to do a recall to change a physical component. They've taken care of problems in the past.... Loose mirrors in the original 5D, metering problems from a light leak in very early copies of the 5D Mark III, overheating AF components in the 1D Mark III. Etc. "Stuff happens", not a lot. But on the rare occasion when it does Canon is really good about resolving things.

I'm interested in the Canon R5 or R6, however I recently read a review on the B and H site, where the reviewer indicated that images taken with the mechanical shutter at 35mm or less and a shutter speed of 1/200 sec. or less resulted in blurry images. I had a chance to visit B & H last week and the Cannon sales staff confirmed that all pictures taken on their demo cameras at those settings resulted in blurry images. Since I enjoy shooting water scenes, cascades and streams, this obviously gave me cause for concern. The only workaround they mentioned was to use the electronic shutter for those situations. The reviewer indicated that Canon was aware of the problem but there was no plans for a fix at this time. I did call Canon support, they were unaware of the problem.

I appreciate comments from folks who have shooting experience with either the Canon 5 or 6 regarding this issue.

Thanks
Bob M
Atlanta, Ga.