Just got it a couple of days ago and I'm blown away by it's sharpness and smooth operation. Only drawback is weight and I need a new camera bag to fit it. This is one of the first shots I took with it. And this had a 1.7 TC attached. 1/1000, F4, 180mm, ISO 200, Monopod Granted, this could be sharper but, after all, it will take a little practice to get my technique down pat.