AF-ON & Back Button Autofocus: This May Just Change the Way You Shoot Forever | Mobile Photography | Scoop.it
The technique is called Back Button Autofocus and it can really change the way you use your camera. Rather than autofocusing with your shutter release, you move the autofocus function exclusively to a button on the back of the camera. When you first hear about this technique, it’s natural to greet the idea with a bit of uncertainty, but once you get used to focusing with this method, you may never go back.