Canon 0304B001 User Manual - Page 89

When Autofocus Fails (Manual Focusing) Autofocus can fail to achieve focus (the focus confirmation light blinks) with certain subjects such as the following: Subjects difficult to focus (a) Low-contrast subjects Example: Blue sky, solid-color walls, etc. (b) Subjects in low light (c) Extremely backlit and reflective subjects Example: Car with a reflective body, etc. (d) Overlapping near and far objects Example: Animal in a cage, etc. (e) Repetitive patterns Example: Skyscraper windows, computer keyboards, 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 and focus manually. If focus cannot be achieved with the AF-assist beam of a Speedlite or Speedlite Transmitter ST-E2, select the center AF point. An off-center AF point may not be able to achieve focus. 89