This is the first time I have had an issue with my MkIII since I got it weeks ago. I have used my 17-40L, Sigma 70-200, Canon 70-200 2.8L, Canon 85 1.8 and this afternoon my Sigma 100-300 f/4. I have shot night football and soccer, day soccer and field hockey with no issues whatsoever. Yesterday I shot a bicycle race with my MkIII and 85 1.8 and 17-40L with bikes coming at me and the camera/lens performed as I expected. I don\'t know what to make of these shots. Now I know I used a slow shutter speed (1/250 at f/4) but I was quite close to the tree with the woodpecker on it. Look at the suet feeder and the bird. The suet feeder is sharp but the bird looks horrible. The second one is even worse and I shot it at 1/400 with the focus point on the middle of the feeder. I took about 30 shots using single shot and they all look like this. Is this the dreaded AF issue or could it be the lens/body combo? I am using the middle focus point with C.FnIII 8-2 (Enable, surrounding point assist) and 9-4 (Inner 9-points). Help?
