Nikon D5000 D5000 User's Guide (English) - Page 173

a: Autofocus a1: AF-area Mode G button ➜ A Custom Settings menu This option determines how the focus point for autofocus is selected (0 56). a2: Built-in AF-assist Illuminator G button ➜ A Custom Settings menu If On is selected and lighting is poor, the built-in AF-assist illuminator (0 55) will light to assist the focus operation in single-servo AF (AF-S selected for focus mode, or single-servo AF selected in AF-A focus mode) when Auto-area is selected for AFarea mode or when Single point, Dynamic area, or 3Dtracking (11 points) is selected and the center focus point is used. If Off is selected, the AF-assist illuminator will not light to assist the focus operation. The camera may not be able to focus using autofocus when lighting is poor. AF-assist illuminator A See Also See page 197 for restrictions on the lenses that can be used with AF assist. See page 212 for the shooting modes in which the AF-assist illuminator can be used. a3: Live View Autofocus G button ➜ A Custom Settings menu This option determines how the focus point for autofocus is selected in live view (0 43). L 155