I know I'm not the only one on this. I get so frustrated, because I'll focus exactly where I want my camera to focus, but something else catches focus instead. I'm usually pretty good if I don't go any more open than f/2.5. But when I open up any more than that, I just can't get the focus where I want it. Oh, sure, I'll get lucky if I take like 20 shots of the same thing, but I want to NAIL it. And every time.
Here's the example that's frustrating me at the moment. Now I know that it's "bad" to place your subject near a tree or something of high contrast because it will have the tendency to grab focus, but this was pretty bad. I guess I'm going to have to start toggling, because something must have moved in the tiny amount that I moved the camera. I was still. Carson was still. I focused on the inside corner of his eye. But focus still caught on the tree. GRR!
It's not quite so noticeable at this size, but if you click on the picture and view the largest size, you should be able to see what I mean. Carson is just ever so slightly soft.
(and I feel like the color might be off on this one. magenta mabye?)