Originally posted by clackers Setting 18 is for when you can't get clean shots of your subject because other things get between it and the camera.
Yes, but that setting just works well, when your subject keeps the same distance to the camera.... ie moves left <-> right or up <-> down... if your subject moves closer to the camera or gets more distant, that function just blows up final results... most shots will be out of focus...
Let's say, a runner for instance... even in a situation with objects get between camera and a runner, if the runner will be running torwards camera, most of the shots will be out of focus... the AF status will be hold for too much time, and never can focus in the correct position of the runner... the focus will be always behind the runner in this case... even if we set the hold status to Low, i can't get nice results...
That's why i sair that for most cases, this setting should be turned off. I've done lot of experiences, and i can't just get nicer results... this setting is very useful in sports, because your subject/player can get behind other oponents, etc... but when the player start to get closer of further to the camera, this settings will mess up most of the shots...
Maybe i'm not getting the technique right... i don't know, but when searching the web, we can see too much people with same problem...