Canon EOS Rebel SL3 DSLR Camera with 18-55mm Lens (Black) - Manual (Page 109)

109
Shooting Tips
z When shooting a portrait up close, use [One-Shot AF] and focus
on the eyes.
Focus on the subject’s eyes before composing your shot.
z 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.
z For easier tracking of moving subjects, use [Automatic selection]
in conjunction with [AI Servo AF] of AF operation ( = 106).
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.
z 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.