Canon POWERSHOT SD400 DIGITAL ELPH User Manual page 172

High-PowerFlash 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.
Tripod Socket
Bracket
(Comes with the flash)
', 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.
,, Be careful not to touch the flash window or sensor windows with your
fingers while the flash is in use.
,, In outdoor settings in the daylight, the flash may not detect
illumination from the camera's built-in flash and may not fire.
,, The flash may fire if another flash is being used in close proximity.
,, The flash may not fire if there are no reflective items in its metering
field.
,, The flash will not fire if the camera's built-in flash does not fire a pre-
flash.
,, For continuous shooting, although the flash fires for the first shot, it
does not fire for subsequent shots.
,, If the battery usage time has considerably diminished, wipe the
battery terminals well with a dry cloth as the terminals may be soiled
with oil from one's skin or other dirt.
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