Originally Posted by
Dave Humphries
Interesting series Richard, although I agree with William's query.
Most IS incorporates an accelerometer feedback system, so it is only compensating for physical camera/lens movements, not subject relative to frame movement, such as blowing branches.
That said, I am not familiar with the IS on your Olympus E-M1, maybe that is optically derived, given that (from what little I think I know) it is corrected by moving the sensor (as distinct from lens based correction systems employed by Nikon, Canon and Panasonic).
I may learn something from subsequent posts clarifying this, may be the E-M1 does do it more the way that video image stabilisation works.
Dave