JakAHearts wrote in post #16564056
Interesting. Im always so afraid to use the "all focos points" setting as I feel like I might lost the subject and have completely out of focus subjects. It really works that well huh?
Well, it depends on the camera. I use all points (Ring of Fire) on my 1Dsmk3 and 1Dmk3. On my 40D, I use one shot on the centre point as it snaps into focus ridiculously quickly. You also gotta adjust your servo settings to optimize for a wedding processional. I set it to the lowest speed/sensitivity settings, that way it is much less likely to wander off the subjects. When you use all points, the camera takes focusing to the next level by detecting the general size and shape of the subjects, which is a lot of info to help keep focus on the subject. Therefore it is much less likely to be fooled by the background or something because it already knows which focus points do NOT fall upon the subjects. It engages it's initial lock using the centre point. From there, you can adjust your composition. I cannot speak for the 5D3 or 1DX as they may have changed the system for the new cameras.
If you know the exact technical details of how your camera works, it's very easy to shoot things successfully with little error. When I get a new camera, I spend a LOT of time studying the manuals. This kind of knowledge you cannot possibly learn from just going out and shooting.