Found this:
https://naturalexposures.com/olympus-om-d-em-1-mark-ll-leica-100-400mm/ Here's the cogent statement from article ... actually
from the blog discussion that follows the article:
Quote:
From what I’ve been told and based on the tests
I ran, it’s best to shut off the Olympus in camera
image stabilization. You want to leave the lens IS
ON. If you do switch the lens IS off AND leave the
camera IS on, then the camera IS takes over.
However, with long telephoto lenses, Image
Stabilization is more effective in the lens.
There's some blog discussion following the article itself
that mentions problems with the Lumix 100-
300 if both
the camera and lens IS are both enabled. It should be
noted that the Lumix 100-300 uses
Mega OIS, which is
not compatible with dual IS.
Power OIS is compatible for
for dual IS ... with
Lumix bodies. Panasonic does not say
anything about Olympus bodies.
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I'm not likely to acquire an Olympus ranked above my
OMD5-II ... cuz I already use a Lumix G9 :-) The only
reason I have a 5-II is cuz it was an Open Box Special
along with the 14-150, and I had "Reward Points" that
were expiring. It's a very likable [even lovable?] verrry
compact all-weather all-purpose body & lens. At $500
in "Monopoly Money" I couldn't resist. That outfit just
follows me around like puppy !