BV1DMKIIn wrote in post #10341069
If your camera has AI-Servo mode, switch to it from One-Shot AF mode. That is the very purpose of AI-Servo. It tracks and predicts where it should focus.
I also am a big fan of switching focus control to the " * " button (AE Lock button by default). Leaving the Shutter button to only control exposure while controlling focus with the back * button gives you more control. Look in your manual at CFn4. Most of the Canon bodies have this CF. There's a few options to choose other than default.
If you find yourself shooting something that is always at the same distance, by having focus control moved to the back * button, when you hit the shutter anticipating the shot, you don't have to worry about the camera trying to focus elsewhere then have to reel the focus back to where it already was. By simply not touching the * button, it's like you have "locked" focus to that focal distance.
If you are in a situation where you need to use manual focus, you do not have to turn the lens' focus from AF to MF. It is "off" already.
Pardon the CFn4 tangent. I use it and depending on what sort of subject/movement I am shooting, I switch back and forth between One Shot and AI-Servo.
Also, depending on your model, switch to Center Focus point. If your letting all focus points remain active, a focus point off your subject may lock focus on something other than your target. Setting it to the center point only will ensure it tries to only focus where you place that center point.
I will have to try this. I mainly leave the camera in Center Focus point and toggle if I need to. I don't like the results when I use any of the zone modes on the 7D.
I do use AI Servo for shots of the dogs running towards me, but I find I only get about 25% keepers. It seems like I get nice sharp shots when the dog is far away, but then as soon as they're closer to me, none of the shots are any good.
I think I may have just answered my own question. It's a DOF problem, isn't it? I need to stop the lens down more. I tend to be a wide open shooter because I love blurred backgrounds.