Canon EOS Rebel SL2 EOS 200D Instruction Manual page 120

S Selecting the AF Point
Shooting Tips
When shooting a portrait up close, use One-Shot AF and focus
on the eyes.
If you set the composition after focusing on the eyes of the person to
be photographed, the vivid facial expression will stand out more in
the picture.
If it is difficult to focus, select the center AF point.
The center AF point has the highest focusing performance among
the nine AF points.
When you want to keep focusing on a moving subject easily,
use automatic AF point selection and AI Servo AF in
combination (p.116).
The center AF point will first be used to focus on the subject. During
autofocusing, if the subject moves away from the center AF point,
focus tracking continues as long as the subject is covered by
another AF point.
If you use an extender (sold separately) in combination and the open
aperture f/number becomes higher than f/5.6, AF shooting will not be
possible (except in Live View shooting). For details, refer to the extender's
instruction manual.
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