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Here is a basic wireless flash setup for the 320EX Speedlite

Sample Wireless Flash System You can easily set up an E-TTL autoflash system with the 550EX, ST-E2 or MR-14EX as the sender unit and the 420EX as the receiver unit. Just set the 420 EX's wireless selector to <receiver> and position the receiver unit( s ) as desired within the wireless transmission range

QuickGuide to Canon Integrated Speedlite Transmitter Operation

Choose this if you want the want the built-in flash to trigger off-camera Speedlites, without contributing to the flash exposure. Fire the Speedlite( s ) with separate flash exposure from the built-in flash Choose this if want to fire the Speedlites (either at equal power or with A: B ratio control), with independent flash exposure from the built-in flash unit Wireless Speedlite Set-up

The 320EX Speedlite will provide flash coverage for the following focal lengths.

The flash head can be extended or retracted manually to match the lens focal length. As the focal length of EF lenses and EF- S lenses differs, extend or retract the flash head while referring to the table below (the flash head position in relationship to the lens focal length).