@benstevens wrote:
I purchase an external flash and place into AL Servo mode, and it resolved it for me "no more" "Busy. I can now shoot multiple times without waiting.
Just a caution about "AI Servo" mode...
Canon has two different behaviors when you press the shutter button to take a shot.
One is called "Focus Priority" which means that the most important factor is that the camera has focused before it will take the shot. That feature is enabled when you use "One Shot" mode.
The other is "Release Priority" which means that the most important factor is that the camera take the shot when you fully press the shutter button and it will do this regardless of whether it had time to focus or not. (that italicized part is very important). This feature is enabled when you use "AI Servo" mode.
The implication here is that when you switched to AI Servo mode, focus no longer becomes important to the camera -- but that doesn't mean you're getting focused shots. It falls to you to half-press the shutter until the camera has focused to your satisfaction before you press the button down all the way. It will take the shot and it will not report 'busy' in that mode.
One aspect of action photography which is a bit different is the notion of the "decisive moment". If a baseball player is sliding into home plate, there is a "moment" when taking the shot would be better than all other moments -- taking the shot a second early or a second later would not be as good. "Release Priority" was designed to address this need of action photographers, and it's why the feature is enabled in "AI Servo" mode (which follows the subject and focuses continuously). Action photographers would have been tracking the subject in anticipation of the moment happening and the focus would have been updating the entire time... so that when the moment arrives they press the shutter release and the camera will take the shot.
Tim Campbell
5D III, 5D IV, 60Da
