Numenorean wrote in post #15605748
Only really useful if you use AI Servo. If you use One Shot, there's no real advantage.
For me there would be an advantage. I use AF for 99.9% of my images (almost never use manual focus). I also focus & recompose for the majority of my images.
In One Shot mode, without back button focus, if I want to focus and recompose, I have to press the shutter button half way down to achieve focus. Then, while moving the camera to recompose the shot, I have to somehow keep my finger half way down on the shutter button.
If, during the time it takes me to carefully move the camera to frame the shot most perfectly, I accidentally press a little too hard with my finger, I end up accidentally taking a shot before I intended to.
If I don't press quite hard enough, the shutter button comes up out of the halfway position, and I lose focus and have to start over again. (well, technically, I don't lose focus, but I would lose my intended focus as soon as I again touched the shutter button to take the shot)
This happened to me all the time before I "discovered" back button focus. I simply do not have the precise muscle control that is necessary to maintain the proper pressure on a button for a few seconds.
"Your" and "you're" are different words with completely different meanings - please use the correct one.
"They're", "their", and "there" are different words with completely different meanings - please use the correct one.
"Fare" and "fair" are different words with completely different meanings - please use the correct one. The proper expression is "moot point", NOT "mute point".