Canon EOS REBEL XS Instruction Manual page 23

Flash Control *
The built-in flash and external Speedlite can also be set with the menu.
The menu for the external Speedlite will be applicable only to EXosedes
SpeedJites whose functions can be set with the camera.
SeJect [Flash control].
® Under the [tg:] tab, select [FJash
controJ], then press <_/>.
_y,, T he flash control screen will appear.
[Flash firing]
® Normally, set this to [EnabJe].
® If [Disable] is set, both the built-in
flash and external SpeedHte will
not fire. This is good when you only
want to use the AF-assist beam.
[Builtdn flash fun¢o se_ing]
® [FJash mode] cannot be selected.
® [FJash exp. comp] can be set as
explained on page 79.
® Set [EoTTL II] as explained on the
next page.
® Shutter synco
Normally, set this to [1st curtain] so that the flash fires immediately
after the exposure starts.
If [2rid curtain] is set, the flash will fire right before the exposure
ends. When this is combined with a slow sync speed, you can create
a trail of light such as from car headlights at night. With 2rid curtain
sync, two flashes will be fired. Once when you press the shutter
button completely, and once immediately before the exposure ends.
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