Nikon 25446B D90 User's Manual - Page 194
a2: Center Focus Point, a3: Built-in AF-assist Illuminator, The AF-Assist Illuminator, See Also
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a2: Center Focus Point This option (available in all shooting modes) determines the size of the center focus point. Option c Normal zone (default) Viewfinder display Description Focus on stationary subjects that can be easily framed in the focus point. 7 Wide zone Focus on moving subjects. Not available when Autoarea is selected for Custom Setting a1 (AF-area mode). See page 54 for more information on focus settings. a3: Built-in AF-assist Illuminator Choose whether the built-in AF-assist illuminator lights to assist the focus operation when lighting is poor. This option is available in all shooting modes except l and m. Option Description If the subject is poorly lit, the AF-assist illuminator will light to assist the focus On (default) operation in single-servo AF (AF-S selected for autofocus mode, or single-servo AF selected in AF-A autofocus mode) when Single point, Auto-area, or 3D-tracking (11 points) is selected for Custom Setting a1 (AF-area mode) or when Custom Setting a1 is set to Dynamic area and the center focus point is selected. L Off The AF-assist illuminator does not light to assist the focus operation. The camera may not be able to focus using autofocus when lighting is poor. A The AF-Assist Illuminator The AF-assist illuminator has a range of about 0.5-3.0 m (1 ft. 8 in.-9 ft. 10 in.); when using the illuminator, use a lens with a focal length of 24-200 mm and remove the lens hood. A See Also See page 231 for restrictions on the lenses that can be used with AF assist. 174