Nikon D3000 User Manual (en)

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Choose a focus mode.
Highlight one of the following options and press 
J. Note that AF-S and AF-C are available only in 
modes PSA, and M.
Option
Description 
AF-A
Auto-servo 
AF
Camera automatically selects single-servo autofocus if subject is 
stationary, continuous-servo autofocus if subject is moving.
AF-S
Single-servo 
AF
For stationary subjects. Focus locks when shutter-release button 
is pressed halfway. Shutter can only be released if camera is able 
to focus.
AF-C
Continuous-
servo AF
For moving subjects. Camera focuses continuously while shutter-
release button is pressed halfway. Shutter can only be released if 
camera is able to focus.
MF
Manual focus
Focus using lens focus ring (if lens is equipped with A/M switch, 
slide switch to M before focusing).
D
Continuous-servo Autofocus
In AF-C mode or when continuous-servo autofocus is selected in AF-A mode, the camera gives 
higher priority to focus response (has a wider focus range) than in AF-S mode, and the shutter 
may be released before the in-focus indicator is displayed.
A
Getting Good Results with Autofocus
Autofocus does not perform well under the conditions listed below. The shutter release may 
be disabled if the camera is unable to focus under these conditions, or the in-focus indicator 
(
I) may be displayed and the camera may sound a beep, allowing the shutter to be released 
even when the subject is not in focus. In these cases, focus manually or use focus lock to 
focus on another subject at the same distance and then recompose the photograph.
There is little or no contrast 
between the subject and the 
background
.
Example
: Subject is the same 
color as the background. 
The focus point contains 
areas of sharply contrasting 
brightness
.
Example
: Subject is half in the 
shade. 
The focus point contains 
objects at different distances 
from the camera
.
Example
: Subject is inside a 
cage. 
Background objects appear 
larger than the subject.
Example
: a building is in the 
frame behind the subject.
The subject is dominated by 
regular geometric patterns
.
Example
: A row of windows 
in a skyscraper.
The subject contains many 
fine details
.
Example
: A field of flowers or 
other subjects that are 
small or lack variation in 
brightness.