Canon EOS M Instruction Manual page 123

Shooting conditions that make focusing difficult
Low-contrast subjects such as the blue sky, solid-color flat surfaces
or when highlights or shadow details are lost.
Extremely bright or dark subjects.
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.
When the image flickers under fluorescent or LED light sources. When the image flickers under fluorescent or LED light sources. When the image flickers under fluorescent or LED light sources.
Extremely small subjects.
Subjects at the edge of the picture. 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.
The AF point covers both a near and faraway subject (such as an The AF point covers both a near and faraway subject (such as an The AF point covers both a near and faraway subject (such as an
animal in a cage).
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
due to camera shake or subject blur. due to camera shake or subject blur. due to camera shake or subject blur.
Autofocusing while the subject is very far out of focus. Autofocusing while the subject is very far out of focus. Autofocusing while the subject is very far out of focus.
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.
In the above cases, if the camera cannot focus automatically, focus
manually.
With some EF lenses (Mount Adapter EF-EOS M required), it may take
longer to achieve focus or correct focus may not be achieved. For the
latest information, visit your local Canon Web site.
Changing the Focusing Method
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