Canon CDI-E334-010 - Manual (Page 182)

Appendix 180
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 High-Power Flash will not fire in the following situations:
- When shooting in
mode
- When Flash Sync is set to [2nd-curtain]
- When Flash Adjust is set to [Manual]
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.
Tripod
Sockets
Bracket
(Comes with the flash)