Nikon D5100 Mode D'Emploi

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Manual Focus
Manual focus can be used when you are not using an AF-S or AF-I lens or when 
autofocus does not produce the desired results (
0 40).
1
Set the lens focus-mode switch.
If the lens is equipped with an M/A-M or A-M mode 
switch, slide the switch to M.
2
Focus.
To focus manually, adjust the lens focus 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
Selecting Manual Focus with the Camera
If the lens supports M/A (autofocus with manual override), manual 
focus can also be selected by setting the camera focus mode to MF 
(manual focus; 
0 39). Focus can then be adjusted manually, 
regardless of the mode selected with the lens.
A-M mode 
switch
M/A-M 
switch