Canon PowerShot SX70 HS Digital Camera - Manual (Page 86)

Changing the Flash Mode
You can change the flash mode to match the shooting scene.
1
Press the button to choose a flash
mode.
Auto flash Fires automatically in low-light conditions.
Flash on Fires for each shot.
Slow synchro
Fires to illuminate the main subject (such as people)
while shooting at a slower shutter speed to illuminate
backgrounds out of flash range.
Flash off For shooting without the flash.
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