Canon EOS REBEL T2I Instruction Manual page 73

Setting the Flash #
[Built-in flash func° setting] and [E×temal flash func. setting]
Settable Functions
E-TTL II (Fixed) 0 148
0 148
- I 0 -
D
0 88
0 149
* Regarding [FEB] (Flash exposure bracketing), [Zoom], and [Wireless set.],
refer to the Speedlite's instruction manual.
® Flash mode
With an external Speedlite, you can select the flash mode to suit
your flash shooting.
® Shutter synco
® [EoTTL Ill is thestandard modeof EX-series
Speedtitesfor automaticflash shooting.
® [Manual flash] enablesyou to setthe flash
outputyourself.This is for advancedusers.
* For other flash modes, refer to your
Speedlite's instruction manual.
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.
However, with shutter speeds faster than 1/30 sec, 1st curtain sync
will automatically take effect.
If an external Speedlite is attached, you can also set [Hi-speed]. For
details, see the Speedlite's instruction manual.
148