Canon EOS 60D - Manual (Page 80)

80
Autofocus can fail to achieve focus (the focus confirmation light
blinks) with certain subjects such as the following:
Subjects difficult to focus
Very low-contrast subjects
(Example: Blue sky, solid-color walls, etc.)
Subjects in very low light
Extremely backlit or reflective subjects
(Example: Car with a highly reflective body, etc.)
Near and far subjects covered by an AF point
(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.56).
(2) Set the lens focus mode switch to <MF> and focus manually.
1
Set the lens focus mode switch to
.
X <4 L> will be displayed on the
LCD panel.
2
Focus the subject.
Focus by turning the lens focusing
ring until the subject looks sharp in
the viewfinder.
When Autofocus Fails
MF: Manual Focusing
Focusing ring
If you press the shutter button halfway during manual focusing, the AF point
which achieved focus will flash briefly in red and the focus confirmation light
will light in the viewfinder.