Nikon D3x Manuel D’Utilisation

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N
Manual Focus
Manual focus is available for 
lenses that do not support 
autofocus (non-AF Nikkor lenses) 
or when the autofocus does not 
produce the desired results 
(pg. 82). To focus manually, set 
the focus-mode selector to M and 
adjust the lens focusing ring until 
the image displayed on the clear 
matte field in the viewfinder is in 
focus. Photographs can be taken 
at any time, even when the image 
is not in focus.
A
A-M Selection/Autofocus with Manual Priority
If the lens supports A-M selection, set the lens A-M switch to M (manual). 
If the lens supports M/A (autofocus with manual override, MF priority) or 
A/M (autofocus with manual override, AF priority), focus can be adjusted 
manually, regardless of the mode selected with the lens.
 
See the 
documentation provided with your lens for details.
Focus-mode 
selector