Nikon 4799 - F 6 SLR Camera, Instruction Manual, Page: 60 / 192

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Situations Where Autofocus May Not Work As Expected
Autofocus does not perform well under the conditions listed below.
If you cannot achieve your desired focus using autofocus, use manual
focus (
x
61) or use focus lock (
x
58) to focus on another subject at
the same distance, then recompose the picture.
There is little or no contrast between the subject and the
background.
Example: Subject is the same color as the background.
The focus area contains objects at different distances from
the camera.
Example: Subject is inside a cage.
The subject is dominated by regular geometric patterns.
Example: A row of windows in a skyscraper.
The focus zone contains areas of extreme contrast.
Example: Subject is half in the shade.
The subject appears smaller than the focus area.
Example: Focus area contains both a foreground subject and
distant buildings.
The subject contains many detailed elements.
Example: A field of flowers or other subjects that are small or lack
variation in brightness.
AF-Assist Illuminators
If the subject is dark, a Speedlight with AF-Assist Illuminator can be used to assist the
autofocus (
x
153, 161).
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