Nikon D330018-55VR User Manual (en)

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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 
(
0 83) or use focus lock (0 81) 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
.
The focus point contains areas of 
sharply contrasting brightness
.
Example
: Subject 
is the same 
color as the 
background.
Example
: Subject 
is half in the 
shade.
The focus point contains objects at 
different distances from the camera
.
Background objects appear larger 
than the subj
ect.
Example
: Subject 
is inside a cage.
Example
: A 
building is in the 
frame behind 
the subject.
The subject is dominated by regular 
geometric patterns
.
The subject contains many fine 
details
.
Example
: Blinds 
or a row of 
windows in a 
skyscraper.
Example
: A field 
of flowers or 
other subjects 
that are small or 
lack variation in 
brightness.