Canon EOS-1D EOS-1D Instructions - Page 73
When Autofocus Fails Manual Focusing
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Using Autofocus (AF) 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 < > (or < > on older lenses) and focus manually. (→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. 3 73