The AF-Area modes are designed to give you control over how many AF sensors are in use at one time, and different ways to track subject movement.
Figure 3-4 shows the AF-area Mode Selector switch in the Single-point AF position.
Predictive Focus Tracking
Let’s say you were playing a ball game and you threw the ball to a running player. You would have to throw the ball slightly in front of the receiving player so that the ball and the player arrive in the same place at the same time. Predictive focus tracking does something similar for you. It saves you from trying to focus your camera in front of your subject and waiting 45 milliseconds for it to arrive. That would be a bit hard to time!
Example of Use
If you are shooting an ...
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