IBIS is causing the wobbles and when using EF lenses IBIS will run in a degraded mode, especially if the EF lens has IS. Try the RF16mm on an IBIS body and you’ll seeAnd you get the wobbles when shooting video. I don't think IS is really as beneficial as IBIS is on the wide end. For example using the EF 16-35 rather then the RF IS lens, the wobbles appear to be almost non existent.
lots of wobble.
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