Nikon Nikon 1 AW1 Reference 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 focus area may be displayed in green
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
(
0 168) or use focus lock (0 171) 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 subject contains areas of sharply 
contrasting brightness.
Example
: The 
subject is the 
same color as 
the back-
ground.
Examples
: The 
subject is half 
in the shade; a 
night scene 
with point illu-
mination.
The subject contains objects at differ-
ent distances from the camera.
Background objects appear larger 
than the subject.
Example
: The 
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 
or is made up of objects that are small 
or lack variation in brightness. 
Example
: Blinds 
or a row of 
windows in a 
skyscraper.
Example
: A field 
of flowers.
The subject is partially obscured by 
floating particles.
Example
: Under-
water photog-
raphy.