Canon EOS REBEL SL1 Instruction Manual page 170

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 (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.
Under fluorescent or LED light sources and when the image fli Under fluorescent or LED light sources and when the image fli Under fluorescent or LED light sources and when the image flickers.
Extremely small subjects.
Subjects at the edge of the picture. Subjects at the edge of the picture.
Subjects strongly reflecting light. Subjects strongly reflecting light. Subjects strongly reflecting light. Subjects strongly reflecting light.
The AF point covers both near and The AF point covers both near and distant subjects (such as an The AF point covers both near and distant subjects (such as an The AF point covers both near and distant subjects (such as an The AF point covers both near and The AF point covers both near and The AF point covers both near and The AF point covers both near and
animal in a cage).
Subjects that keep moving within Subjects that keep moving within the AF point and cannot keep still Subjects that keep moving within the AF point and cannot keep still Subjects that keep moving within the AF point and cannot keep still Subjects that keep moving within Subjects that keep moving within Subjects that keep moving within Subjects that keep moving within
due to camera shake or subject blur. due to camera shake or subject blur. due to camera shake or subject blur. due to camera shake or subject blur. due to camera shake or subject blur. due to camera shake or subject blur. due to camera shake or subject blur. due to camera shake or subject blur.
A subject approaching or mo A subject approaching or moving away from the camera. A subject approaching or moving away from the camera. A subject approaching or mo A subject approaching or moving away from the camera. A subject approaching or mo A subject approaching or mo A subject approaching or mo A subject approaching or mo A subject approaching or mo A subject approaching or mo A subject approaching or mo
Autofocusing while the subject Autofocusing while the subject Autofocusing while the subject Autofocusing while the subject Autofocusing while the subject is very far out of focus. Autofocusing while the subject
Soft focus effect is applied with a soft focus lens. Soft focus effect is applied with a soft focus lens. Soft focus effect is applied with a soft focus lens.
A special effect filter is used. A special effect filter is used. A special effect filter is used.
Noise (spots, banding, etc.) appears on the screen during AF. Noise (spots, banding, etc.) appears on the screen during AF. Noise (spots, banding, etc.) appears on the screen during AF.
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distant subjects (such as an distant subjects (such as an distant subjects (such as an distant subjects (such as an distant subjects (such as an
the AF point and cannot keep still the AF point and cannot keep still the AF point and cannot keep still the AF point and cannot keep still the AF point and cannot keep still
ving away from the camera.