Nikon d3s User Manual (en)

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Focusing with Contrast-Detect Autofocus
Contrast-detect autofocus will take longer than normal (phase-
detection) autofocus. In the following situations, the camera may be 
unable to focus using contrast-detect autofocus:
• The camera is not mounted on a tripod
• The subject contains lines parallel to the long edge of the frame
• The subject lacks contrast
• The subject in the focus point contains areas of sharply contrasting 
brightness, or the subject is lit by spot lighting or by a neon sign or 
other light source that changes in brightness
• Flicker or banding appears under fluorescent, mercury-vapor, sodium-
vapor, or similar lighting
• A cross (star) filter or other special filter is used
• The subject appears smaller than the focus point
• The subject is dominated by regular geometric patterns 
(e.g., blinds or a row of windows in a skyscraper)
• The subject is moving
Note that the focus point may sometimes be displayed in green when 
the camera is unable to focus.
Use an AF-S lens. The desired results may not be achieved with other 
lenses or teleconverters.
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Remote Cords
If the shutter-release button on a remote cord (available separately; see 
0 376) is pressed halfway for over a second in tripod mode, it will 
activate contrast-detect autofocus. If the remote cord shutter-release 
button is pressed all the way down without focusing, focus will not be 
adjusted before the picture is taken.