Canon 1901B004 User Manual - Page 80
When Autofocus Fails
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When Autofocus Fails Autofocus can fail to achieve focus (the focus confirmation light 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 and reflective subjects Example: Car with a reflective body, etc. Overlapping near and far objects Example: Animal in a cage, etc. 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. (p.48) (2) Set the lens focus mode switch to and focus manually. Manual Focusing 1 Set the lens focus mode switch to . 2 Focus the subject. Focus by turning the lens focusing ring until the subject looks sharp in the viewfinder. If you press the shutter button halfway during manual focusing, the active AF point and the focus confirmation light in the viewfinder will light when focus is achieved. 80