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CMS-XML QuickGuide to Canon 320EX Speedlite Features
This is particularly useful when shooting video, as a modeling light, or as an AF assist beam (with Live View). ... It will automatically shut off after 60 minutes of idle use to conserve battery power . If battery power is low the LED Light will not turn on, even if the flash ready light is lit, in which case you should replace the batteries.
CMS-XML How to use the AF-Assist Beam and what is its coverage on the 320EX Speedlite
How to use the AF- Assist Beam and what is its coverage
CMS-XML How to turn the 320EX Speedlite on and off.
Set the power switch to <ON>
CMS-XML Here is a basic wireless flash setup for the 320EX Speedlite
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.
CMS-XML QuickGuide to Canon Integrated Speedlite Transmitter Operation
Ratio control between built-in flash and off-camera Speedlites Choose this option if you want the built-in flash to fire at one level of E-TTL power and the combined receiver unit(s) to fire at another. Note: Because the built-in flash is smaller and less powerful than an external Speedlite, the camera will not allow you to set ratios that would require the built-in flash to overpower the receiver units.