When Autofocus Fails (Manual Focusing) - Canon EOS-1Ds Instruction Manual

When Autofocus Fails (Manual Focusing)

Autofocus can fail to achieve focus (the focus confirmation light blinks) with certain subjects
such as the following:
(a) Low-contrast subjects (blue sky, solid-color walls, etc.).
(b) Subjects in low light.
(c) Extremely backlit reflective subjects (car with a reflective body, etc.).
(d) Overlapping near and far objects (animal in a cage, etc.).
In such cases, do one of the following:
1. Focus an object at the same distance as the subject and lock the focus before recomposing.
2. Set the lens focus mode switch to <
(→p.26)
If focus cannot be achieved with the AF-assist light of a Speedlite or ST-E2, select
the center AF point. An off-center AF point might not be able to achieve focus.
> (or < > on older lenses) and focus manually.
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