Just testing the Image stabilisation with this combo.
I had heard the image stabilisation wasn't very good when used with either the Olympus 100-400mm or the Panasonic 100-400mm as it doesn't have sync IS. On the GH5 and Panasonic 100-400mm I could handhold video easily so was a bit worried.
I didn't need to worry. This was handheld and I had accidentally turned on the digital 1.4 crop as well. Its certainly stable enough for me!