Nikon 25434 D3 Professional Technical Guide - Page 7

Autofocus: Focusing with 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-C priority 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 shutterrelease button is pressed halfway. 2 Select dynamic-area AF. Rotate the AF-area mode selector to I (dynamicarea AF). If the subject briefly leaves the selected focus point, the camera will focus based on information from surrounding focus points. 7