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CMS-XML 420EX Speedlite: Here is a basic wireless flash setup.
Sample Wireless Flash System You can easily set up an E-TTL autoflash system with the 550EX, ST-E 2 or MR-14EX as the sender unit and the 420EX as the receiver unit. Just set the 420EX's wireless selector to <receiver> and position the receiver unit(s) as desired within the wireless transmission range
CMS-XML 420EX Speedlite : How to set and use the Second-Curtain Sync mode.
Normally, 1st curtain synchronization is set so that the flash is fired when the shutter curtains fully open. With 2 nd curtain synchronization the flash is fired right before the shutter curtains close. When this is combined with a slow shutter speed, you can capture the light trail following the moving subject.