Focusing the Autofocus:
The a Autofocus group in the first level of the Custom Settings menu contains a variety of advanced autofocus options. This chapter details options that can be used to frame moving subjects at sporting events: a1 (AF-Cpriority selection), a3 (Dynamic AF area), and a4 (Focus tracking with lock-on). These options are best used with the focus mode selector rotated to C (continuous-servo AF) and the AF-area mode selector rotated to I (dynamic-area AF).

1. Select continuous-servo AF. Rotate the focus-mode selector to C. The camera will continually adjust focus while the shutter-release button is pressed halfway.
2. Select dynamic-area AF. Rotate the AF-area mode selector to I (dynamic-area AF). If the subject briefly leaves the selected focus point, the camera will focus based on information from surrounding focus points
3. Choose an option for Custom Setting a1. Choose whether the camera gives priority to focus or to shutter response in focus mode C.
4. Choose an option for Custom Setting a3. Choose the number of focus points used for dynamic-area AF. Select 9 points or 21 points for track-and-field events or for subjects that move unpredictably.

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