Nikon AF-S DX NIKKOR 18-55mm f/3.5-5.6 VR Manuel De L'utilisateur page 19

Notes on using wide or super-wide angle AF Nikkor lenses
In the following situations, autofocus may not perform as expected when shooting with wide or super-wide angle
AF Nikkor lenses.
A person standing in front of a
distant background
A field filled with flowers
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1. When the main subject in the focus
brackets is relatively small
When a person standing in front of a distant
background is placed within the focus brackets, as
shown in Fig. E, the background may be in focus,
while the subject is out of focus.
2. When the main subject is a finely
patterned subject or scene
When the subject is finely patterned or of low
contrast, such as a field filled with flowers, as shown
in Fig. F, focus may be difficult to acquire using
autofocus.
Responses to these types of situations
(1) Focus on a different subject located at the same
distance from the camera, apply focus lock,
recompose, and shoot.
(2) Set the camera focus mode selector to M (manual)
and focus manually on the subject.
Refer to "Getting Good Results with Autofocus" in the
camera's User's Manual.
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