Canon EOS REBEL T6 (W), Основное руководство пользователя

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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 (dots of light, banding, etc.) appears on the screen during AF.