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Very bizarre. I've had no issues at all with the 35-100 unless you're shooting with OIS enabled at extremely high shutter speeds (like 1/3200-1/4000s). I use the OM-D's IBIS with this lens, as it stabilizes a little faster and gives me about an extra stop over the OIS, but I have found the OIS to be very good for 2-3 stops and the OM-D's IBIS with this lens to be good for 3-4 stops. Very bizarre to see it with the IBIS. Possible your IS switch isn't working? (so that it's actually trying to use OIS with IBIS?)
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I verified the switch is working because if I mount the lens on a GF2 I see the on-screen indication of OIS changing. I've never had an issue with IBIS before either, with any lens. I've repeated the experiment 5 times and each time it confirms the same - any shutter speed between 1/40 through at least 1/100 demonstrates nervous blurring with my 35-100. I found this reference online as well:
"IBIS has the dreaded shutter shock issue. The fast shutter movement (e.g. 1/60, 1/125) & firm hands grip might send enough shock to the sensor so that IBIS might try to fix it which might create double imaging sometimes. All of previous PENs have such issue. That's why PENs have anti-shock feature that delays photo taking where 1/8 is the shortest delay. Press shutter button, opens shutter curtain, waits, then captures lighting info. In-Lens IS has no such issue. Also ILIS keeps the sensor cool."