We got these in at work and I just have to say that while the Tamron IS unit seems to be a little slow on the uptake, once it stabilizes itself, it is ROCK steady. 1/6 @ 300mm is no problem even on a crop body. IB... Its still a Tamron Its loud Its a 28-300 lens Its crap Or any other unforeseen negative response. Im not saying the lens is good. Im just saying that I was honestly amazed at how steady the VC is on this particular lens.