p.2 #1 · Image Stabilization on Canon Cameras and Lenses
You did not mention EF lenses..
I shoot Canon dslrs and EF lenses 90% of my photography..
I have hand tremors due to pre-Parkinson diagnosis....At 79 I NEED IBIS or IS/OIS...IBIS in my Fuji GFX.
I can get as low as 1/30 and even lower, with either. I have a 1/15 somewhere but can't find it...but it was rock steady.
My hand tremors are not noticable.
Both features used have caused some minor issues but acceptable for me. My Fuji GFX IBIS and GF 120mm OIS are primo!!
p.2 #2 · Image Stabilization on Canon Cameras and Lenses
As an update:
Canon returned the R5 MKii body and stated it was in spec.
After a pretty dismal retest of the body with no improvement, I sent the RF 400, the RF 2x TC and the body back to canon.
I asked them to check the calibration of the equipment together, uploaded some images, and they found that the "sensor was out of position causing the autofocus to operate improperly".
They then made corrections and returned it to me free of charge - thank you Canon.
The test will be this weekend, so hopefully everything is now good.