Canon Speedlite 430EX II - Manual (Page 17)

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With high-speed sync (FP flash), the flash can synchronize with all
shutter speeds. This is convenient when you want to use aperture
priority for fill-flash portraits.
Press the <E> button so that
<c> is displayed.
Check that the icon is lit in the
viewfinder.
c High-Speed Sync
If you set a shutter speed that is the same or slower than the camera’s
maximum flash sync speed, will not be displayed in the viewfinder.
With high-speed sync, the faster the shutter speed, the shorter the
effective flash range will be. Check the LCD panel for the maximum flash
range for the respective shutter speed.
To return to normal flash, press the button so that icon
turns off.
With a slow shutter speed, you can create a light trail following the
subject. The flash fires right before the shutter closes.
Press the <E> button so that
<r> is displayed.
r Second-Curtain Sync
Second-curtain sync works well in the camera’s “buLb” mode.
To return to normal flash, press the button. The icon will
disappear.
With E-TTL II/E-TTL, when you press the shutter button completely, a
preflash will be fired. Then right before the shutter closes, the main flash
is fired.
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