Eloy,
Think of image stabilization as a gyroscope. It's constantly searching for movement to counteract the pitch and yaw of your camera. When you are hand holding, that's a good thing, because your body is constantly moving, even when you breathe.
When you use a tripod, there is no movement, but the gyroscope is still searching, but it's seaching for movement that isn't there. That's why people advise turning your IS off. When you turn the IS off on your lens, it also turns off the IBIS in your camera.
The thing I didn't like about Digital IS, at least on my camera (a crop sensor T8i), is that it adds an additional crop to the 1.6 crop that my camera already has.Canon doesn't tell what that additional crop is, but I figure it's about 1.0 or so.
If I am shooting 4K, the 4K adds 1.5 to 2.0 of crop on top of my 1.6, so I'm looking at a crop of 3.0 or so, and to add an additional 1.0 because of Digital IS, I'm looking at a crop of around 4.0.
I do use that Digital IS if I am hand holding.
Now, your R5 Mark II is a full-frame camera, so you don't have to worry about the initial 1.6 crop, but the Digital IS is going to add a little crop.
I'm sorry, but your videos did show some movement. It's slight, but it's there.
One thing you can do is put your camera on a tripod and turn off your lens's IS. in the beginning of your video, shoot a few frames of throwaway video, and then using a video editing program, cut those out from your final product.
Just a suggestion.
Steve Thomas
