Canon Speedlite 320EX - Manual (Page 31)

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With a slow shutter speed, you can create a light trail following the
subject. The flash fires right before the shutter closes.
1
Select [Shutter sync.].
Select [Shutter sync.] and press
<0>.
2
Set [2nd curtain].
Set [2nd curtain] and press <0>.
X Second-curtain sync is set.
Second-curtain SyncN
Second-curtain sync works well in the camera’s Bulb mode.
To return to normal flash firing, set [Shutter sync.] to [1st curtain].
In E-TTL II/E-TTL flash mode, when you press the shutter button
completely, a preflash will be fired. Then, right before the shutter closes,
the main flash is fired.
COP
Y