Canon EOS M2 Instruction Manual page 119

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.

Extremely small subjects.

Subjects at the edge of the picture.

Subjects strongly reflecting light.

The AF point covers both near and distant subjects (such as an animal in a
cage).

Subjects that keep moving within the AF point and cannot keep still due to
camera shake or subject blur.

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.

In the above cases, if the camera cannot focus automatically, focus manually.

With some EF or EF-S lenses (Mount Adapter EF-EOS M required), it may
take longer to achieve focus or correct focus may not be achieved. For more
information, refer to Canon Web site.
Using AF to Focus (AF Method)
119