Canon PowerShot G10 - Manual (Page 274)

272
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 a Supplementary Flash (Sold
Separately)
z The High-Power Flash will not fire under the following
circumstances.
- When shooting in mode
- When [Shutter Sync.] is on [2nd-curtain]
- When [Flash Mode] is on [Manual]
(p. 113)
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.
Tripod Sockets
Bracket
(Comes with the flash)