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Your camera's default Autofocus system is very good and should be able to provide you with accurate focus for most of the subjects that you shoot. However, focusing is a complex process. Your camera's Autofocus can be stymied by low-light situations, moving subjects, solid colors, and more. For that reason, the camera includes several different focus modes. The D800 has two autofocus modes. I'm currently in AF-S mode. S is Single-Servo Autofocus. This is the mode that you've been using. It's the mode you're probably used to.
It's ideal for stationary subjects. It works just as you've seen. I half-press the Shutter button when the focus locks on my stationary subject. I then press the Shutter button the rest of the way to take my shot. If I work quickly, I can shoot a moving object by putting a focus point on my subject as it's moving, locking focus, and then reframing. As long as my subject and camera don't change distance between each other, then I'm still good. But I also have a Continuous-Servo Autofocus that's designed specifically for shooting moving subjects.
To get that, I press the AF mode button, which is over here on the side of the camera. It's actually a combination of a rocker switch and a button. The switch part lets me change between autofocus and manual focus, depending on what type of lens I'm using. And in the middle is a button. I'm going to press and hold that, and when I do, my screen up here changes, and now using the main command dial, I can change from AF-S to AF-C. And those are my only two options. They just go back and forth there. So I'm now going to let go of the button, and now I am in Continuous-Servo Autofocus.
So the idea here is if I half-press to lock focus on my subject, the camera will continue to track that subject as it moves around. Now, how a good job it does of tracking depends on the autofocus area mode that you have selected. There are different area modes that are better suited to different types of motion, and we're going to look at all of your Autofocus Area mode options in the next movie.
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