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CMS-XML 420EX Speedlite : How to turn the Speedlite flash on and off.
The main switch has the following settings Turns off the power Turns on the power
CMS-XML 420EX Speedlite: Here is a basic wireless flash setup.
If the 420EX receiver unit is not used for about 10 minutes, the SE mode will take effect (indicated by a blinking channel No.) automatically to turn off the power. Pressing the sender unit's test firing button within 30 minutes after the SE mode starts will turn the receiver unit back on.