Canon EOS Rebel T6i EF-S 18-55mm IS STM Lens Kit Instruction Manual - Page 212
Shooting Conditions that Make Focusing Difficult
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Using AF to Focus (AF Method) Shooting Conditions that Make Focusing Difficult Low-contrast subjects such as the blue sky, solid-color flat surfaces or when highlight or shadow details are lost. Subjects in low light. Stripes and other patterns where there is contrast only in the horizontal direction. Subjects with repetitive patterns (Example: Skyscraper windows, computer keyboards, etc.). Fine lines and subject outlines. Under a light source whose brightness, color, or pattern keeps changing. Night scenes or points of light. The image flickers under fluorescent or LED lighting. Extremely small subjects. Subjects at the edge of the picture. Strongly backlit or reflective subjects (Example: Car with a highly reflective body, etc.). The AF point covers both near and distant subjects (Example: Animal in a cage, etc.). Subjects that keep moving within the AF point and cannot keep still due to camera shake or subject blur. A subject approaching or moving away from the camera. Autofocusing while the subject is very far out of focus. Soft focus effect is applied with a soft focus lens. A special effect filter is used. Noise (spots, banding, etc.) appears on the screen during AF. 212