Canon EOS 1000D instruction manual When Autofocus Fails, Subjects difficult to focus, 162

When Autofocus Fails

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 or reflective subjects Example: Car with a 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.46)

(2)Set the lens focus mode switch to <MF> and focus manually.

If an Extender (sold separately) is attached and the maximum aperture of the lens is f/5.6 or smaller (larger f/number), AF will not be possible (except Live mode AF). For details, see the Extender’s instruction manual.

For the cases AF can fail to achieve focus with Live mode AF, see page 106.

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