Press the shutter button halfway to do so. Now when the action occurs, just press the shutter button the rest of the way. Your image-capture time is faster because the camera has already done the work of establishing focus.
Remember that in AI Servo mode, you must keep the subject under the active autofocus point (or points) in order for the camera to maintain focus. Again, Chapter 6 details this feature.
Using these techniques should give you a better chance of capturing any fast-moving subject. But action-shooting strategies also are helpful for shooting candid portraits of kids and pets. Even if they aren't currently running, leaping, or otherwise cavorting, snapping a shot before they do move or change positions is often tough. So if an interaction or scene catches your eye, set your camera into action mode and then just fire off a series of shots as fast as you can.
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Compared to film cameras, digital cameras are easy to use, fun and extremely versatile. Every day there’s more features being designed. Whether you have the cheapest model or a high end model, digital cameras can do an endless number of things. Let’s look at how to get the most out of your digital camera.