Canon EOS Rebel SL1 18-55mm IS STM Kit Instruction Manual - Page 165

Using AF to Focus (AF Method) You can also tap the LCD monitor screen to select the face or subject. If the subject is not a face, < > will be displayed. If no faces can be detected, or if you tap the LCD monitor but do not select any face or subject, the camera will switch to [FlexiZone - Multi] with automatic selection (p.166). 3 Focus the subject. Press the shutter button halfway to focus. X When focus is achieved, the AF point will turn green and the beeper will sound. X If focus is not achieved, the AF point will turn orange. 4 Take the picture. Check the focus and exposure, then press the shutter button completely to take the picture (p.150). If the subject's face is significantly out of focus, face detection will not be possible. You can prevent this by setting [Continuous AF] to [Enable]. An object other than a human face may be detected as a face. Face detection will not work if the face is very small or large in the picture, too bright or too dark, or partially hidden. The may cover only part of the face. 165