Canon EOS REBEL XS Manual Do Utilizador

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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 EX-series 
Speedlites whose functions can be set with the camera
.
Select [Flash control].
 
Under the [6] tab, select [Flash 
control
], then press <0>.
X
The flash control screen will appear.
 
Normally, set this to [Enable].
 
If [Disable] is set, both the built-in 
flash and external Speedlite will 
not fire. 
This is good when you only 
want to use the AF-assist beam.
 
[Flash mode] cannot be selected.
 
[Flash exp. comp] can be set as 
explained on page 79.
 
Set [E-TTL II] as explained on the 
next page.
 
Shutter sync.
Normally, set this to [1st curtain] so that the flash fires immediately 
after the exposure starts.
If [2nd 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 2nd curtain 
sync, two flashes will be fired. Once when you press the shutter 
button completely, and once immediately before the exposure ends.
3
 Flash ControlN
[Flash firing]
[Built-in flash func. setting]
COP
Y