I've seen a lot of qualitative comments about the effectiveness of these different stabilisation methods, but very few on the quantitative effectiveness. With the latest Canon lenses, they are claiming 4 stops of IS - the 15-85 (see review: Canon EF-S 15-85mm f/3.5-5.6 IS USM Lens Review) states: The best I can come up with for Panasonic Mega OIS is: Camera Ergonomics: How Effective is Panasonic OIS ? which makes it about a stop or so (which IMHO is pretty poor). Does anyone have any figures for the effectiveness of the IS systems in Panasonic and Olympus? The Panasonic site says (for the 12-35) Which would make it somewhere about 2 stops, which isn't brilliant. Olympus IBIS says (from the UK Olympus web site): Which is a very bold claim. Does anyone have any pointers to tests done on OIS/IBIS?