Canon EOS 7 - Manual (Page 48)

When Autofocus Fails
The camera has a high-precision AF system which can focus almost all
subjects. However, it can fail to achieve focus (the in-focus indicator blinks)
the subjects listed below.
Difficult Subjects for Autofocusing
• Low-contrast subjects. Example: Blue sky. flat surface with a solid color.
• Subjects in very low light.
• Extremely backlit or reflective subjects. Example; Automobile with a
highly reflective finish.
• Overlapping near and far objects. Example: Animal behind bars in a cage.
In such cases, use one of the following methods to focus:
(1) Focus lock an object at the same distance as the subject and
recompose.
(2) Set the lens focus mode switch to or and focus manually as
explained below.
0 If focus cannot be achieved even with the EOS-dedicated Speedlite's AF-assist
light, select the center focusing point instead of an off-center focusing point.
(SQ Manual Focusing
Set the lens focus mode switch to
(or on older lenses).
The icon will be displayed on
the LCD panel.
Focus the subject.
• Turn the lens focusing ring until the
subject is in focus in the viewfinder.
0 If you focus manually while you hold down the shutter button halfway, the
focusing point(s) achieving focus will flash in the viewfinder and the in-focus
indicator <•> will also light.
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