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CMS-XML Using Nickel Zinc batteries in the Canon Speedlites.
CMS-XML Troubleshooting: The Speedlite does not fire.
The batteries are installed in the wrong orientation Install the batteries in the correct orientation The Speedlite's batteries are exhausted If the flash recycling time takes 30 sec. or longer, replace the batteries. Install the Speedlite's batteries even when you use an external power source
CMS-XML 420EX Speedlite : How to turn the Speedlite flash on and off.
After 90 sec. of non-use, the SE (Save Energy) mode take effect automatically to turn off the 420EX and save battery power