Actually, I think the write up in the link helps prove IBIS from Sony is not very effective at all at long focal lengths. The very old Soligor lens he is using is manual focus, at f/5.6, and hand held. I'd like to see a controlled test with a Sony native AF lens and wide open. All of Sony's long lenses are image stabilized (OSS). All of them. I must wonder why that is? Sony also makes nothing longer than 400mm.This, from Sony IBIS, indicates that it is effective for long focal lengths. Of course there will be some implementation differences.