Remember a few weeks ago when I mentioned my personal discovery of "back-button" focusing? Well here’s a video about using the technique courtesy of Nikon Blog. With simple use of the AF On button, you can easily separate focus activation from the shutter release. This makes it especially easy to start and stop focus tracking to have a better shot at precisely capturing a fast-moving subject. That’s why sports shooters seem to be so keen on the technique. But even if you’re not a sports photographer, there’s bound to be a back-button focusing approach that works for you. The video is especially useful for Nikon shooters, but the principles apply across other camera brands too.