Lens rentals has an article about IS.
(If the link gets scrubbed google "LensRentals Image Stabilization"
Nothing really new except for this:
"Olympus seems to think the limit is 6.5 stops of image stabilization. In a recent interview, Setsuya Kataoka, part of the Imaging Product Development Division at Olympus, claimed that image stabilization’s theoretical limit is set at 6.5 stops of stabilization, due to rotation of the earth interfering with gyro sensors. I’ll let the comments below determine if that is a scientific fact, or just marketing mumbo jumbo."
IS is subject to coriolis!
It is mumbo jumbo.
How do they compensate for the effect behaving differently on different parts of the globe, northern and Southern Hemispheres. At the equator, there effect disappears, and gets stronger the further you move away from it..
I heard an explanation of IS as a comparison to a car traveling at 60mph for 5 minutes, it is easy to figure you will be about 5 miles from where you started. Yeah, you might be off a little bit because you may be moving at 59 or 61 mph, but where you end up is easily in walking distance of your predicted location. Not too bad! But, if you try to predict where the car will be after an hour instead of 5 minutes, that same small 1 mph error will magnify over that longer time period, and you'll end up a full mile off. Can you live with or are you OK with that big of an error ?
Same with IS. The more you ask it to do the less effective it gets. It works very well at a 1 stop helper but when you get to 3 or 4 stops it works less because of tiny miscues in the electronics and motors and I guess the Earth's rotation.
"...image stabilization’s theoretical limit is set at 6.5 stops ..."
Theory's are great until they are proved to be wrong. Just ask any astronomer or NASA.