OK I really seem to push this lens. With my other post with the star trails, while that's not really pushing it, it does show that it can be a cracker of a lens! My husband's band had their first gig last Saturday and I really got to push it and the camera. It was very dark and the shooting was at ISO6400, and I was still getting speeds of only 1/10-1/30 or so. The IS worked very well, as static parts were fairly sharp, for the ISO, but the moving parts really blurred. But it was also slightly good blur as the motion really added to the mood. I hate to do this, but i'm going to link to the photos instead of posting them here. Partly because there are 51 of them! There are also links to video from youtube as well so you can see how well it shoots at high ISO handheld. Kristin Troost Hall Photography: Psychic Revolution's First Gig!!