Here is a good demonstration of the IBIS or Vibration Reduction on the Nikon Z series mirrorless camera. You can watch the Nikon Z6 & Nikon Z7 IBIS image stabilization test and lens VR demo with FTZ adapter below.
In the test video below a Nikkor 70-200 G 2.8 zoom lens used with the FTZ lens adapter on the Z6 body with VR turned on and off from both camera and lens. Check it out!
The conclusion from the video review:
Regardless of the electronic VR being engaged or not, is that when VR (IBIS) AND the lens VR are engaged, the image is most stable. The electronic VR engaged at the same time crops in a little and appears stable.
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