Canon Speedlite 90EX Instruction Manual - Page 20
Fully Automatic Wireless Flash - master
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Fully Automatic Wireless Flash In this shooting mode, all flash units except the 90EX fire with the same flash output, and ETTL II autoflash is used to obtain a standard exposure from the total flash output. 1 Check the communication channel. You can change the transmission channel to avoid interference with other wireless multiple Speedlite systems being used. Set the same channel for both the master unit and slave unit. 2 Position the camera and Speedlites. Position the Speedlites within the range shown on page 20. 3 Set the master unit's flash mode to . For shooting, will also be set automatically for the slave unit(s). 18
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18
In this shooting mode, all flash units except the 90EX fire with the same flash output, and E-
TTL II autoflash is used to obtain a standard exposure from the total flash output.
1
Check the communication channel.
You can change the transmission channel to avoid
interference with other wireless multiple Speedlite
systems being used. Set the same channel for both
the master unit and slave unit.
2
Position the camera and Speedlites.
Position the Speedlites within the range shown on
page 20.
3
Set the master unit’s flash mode to
<
a
>.
For shooting, <
a
> will also be set
automatically for the slave unit(s).
Fully Automatic Wireless Flash