Originally Posted by
DavidEccleston
Check your AF setup. I think Canon usually defaults to Servo bursts using Shutter Priority, then Focus Priority, so the first shot is taken when you press the shutter, focussed or not (okay for non-fast moving subjects / has no predictive focus, tracking always lags), then subsequent shots will use predictive focus. I change it to Focus priority always. See if this helps improve your keeper rate. It may add a delay a bit on a shutter press, so not always ideal, but far better for moving subjects. Shutter priority is good when you need a specific moment more than you need accurate focus.