Chigh-Speed Sync; Rsecond-Curtain Sync - Canon Speedlite 430EX Instruction Manual

cHigh-Speed Sync

With high-speed sync, you can use flash with all shutter speeds. This is
convenient when you want to use aperture priority for fill-flash portraits.
If you set a shutter speed that is the same or slower than the camera's
maximum flash sync speed, <F> wil 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 <E> button so that <c> icon
turns off.

rSecond-Curtain Sync

With a slow shutter speed, you can create a light trail following the
subject. The flash fires right before the shutter closes.
Setting the shooting mode to "buLb" will make it easier for second-
curtain sync.
To return to normal flash, press the <E> button so that the <r>
icon turns off.
With E-TTL ll/E-TTL, the flash will fire twice even with a slow sync speed.
The first flash is the preflash.
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Press the <E> button so that
<c> is displayed.
Check that the <F> icon is lit in the
viewfinder.
Press the <E> button so that
<r> is displayed.