Canon 970 IS - Manual (Page 102)

100
You can lock the flash exposure so that the exposure settings are
correctly set regardless of the composition of your subject.
To Release the FE Lock:
Press the
button.
z In movie mode, AE lock can also be set/canceled (p. 85) .
z You can use the FE lock when using the flash.
Locking the Flash Exposure Setting
(FE Lock)
Available Shooting Modes p. 232
1
Turn on the LCD monitor.
2
Press the button and select (flash on).
3
Aim the camera at the subject on which you
wish to lock the exposure.
4
Press and hold the shutter button halfway and
press the button.
• The flash will pre-fire and will display.
5
Re-aim the camera to compose the shot as
desired and press the shutter button fully.