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Autofocus can fail to achieve focus (the focus confirmation light <o>
blinks) with certain subjects such as the following:
Subjects difficult to focus
Low-contrast subjects
Example: Blue sky, solid-color walls, etc.
Subjects in low light
Extremely backlit and reflective subjects
Example: Car with a reflective body, etc.
Overlapping near and far objects
Example: Animal in a cage, etc.
Repetitive patterns
Example: Skyscraper windows, computer keyboards, etc.
In such cases, do one of the following:
(1) With One-Shot AF, focus an object at the same distance as the
subject and lock the focus before recomposing. (p.83)
(2) Set the lens focus mode switch to <g> and focus manually.
1
Set the lens focus mode switch to
<MF>.
2
Focus the subject.
Focus by turning the lens focusing
ring until the subject looks sharp in
the viewfinder.
When Autofocus Fails
Manual Focusing
During manual focusing, the center AF point for automatic AF point
selection or the selected AF point for manual AF point selection will flash in
red when it achieves focus. The focus confirmation light <o> will also light.