Canon PowerShot SX70 HS Digital Camera - Manual (Page 46)

Frames on the Shooting Screen
Frames for focusing (AF points) are displayed on the shooting screen.
White frame
Displayed around the subject or person’s face detected
as the main subject.
Green frame
Displayed after the camera focuses when you press the
shutter button halfway.
Blue frame
Displayed as the camera continues to focus on moving
subjects.
Displayed as long as you press the shutter button
halfway.
Yellow frame
Displayed if the camera cannot focus when you press
the shutter button halfway.
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