Canon 970 IS - Manual (Page 217)

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High-Power Flash HF-DC1
This flash is used to supplement the camera’s built-in flash when the
subject is too far away for proper illumination. Use the following
procedures to affix the camera and High-Power Flash to the supporting
bracket.
Please read the instructions accompanying the flash along with this
explanation.
Using an Externally Mounted Flash
(Sold Separately)
z The flash charge time will lengthen as the battery charge
gets weaker. Always set the power/mode switch to off when
you finish using the flash.
z Be careful not to touch the flash window or sensor windows
with your fingers while the flash is in use.
z The flash may fire if another flash is being used in close
proximity.
z The High-Power Flash may not fire outdoors in daylight or
when there are no reflective items.
z For continuous shooting, although the flash fires for the first
shot, it does not fire for subsequent shots.
Tripod
Sockets
Bracket
(Comes with the flash)