About Wireless Flash; Wireless Settings - Canon Speedlite 90EX Instruction Manual

About Wireless Flash

With multiple Canon Speedlites having the wireless flash feature, you can create various
lighting effects with the same ease as using normal E-TTL II/E-TTL autoflash.
The settings you input with the 90EX attached to the camera are also automatically
transmitted to the slave units which are controlled by the master unit via wireless. Therefore,
you need not operate the slave unit(s) at all during the shoot.
The basic wireless set-up is illustrated on the next page. All you need to do is set the master
unit to <a> to enable wireless E-TTL II autoflash (p.18).
During wireless flash shooting, the 90EX fires to control the slave flash but does not fire

as a flash.
During wireless flash shooting, the 90EX will not fire as AF-assist beam.


Wireless Settings

You can use the menu to switch between normal flash shooting and wireless flash shooting.
During normal flash shooting, be sure to turn off the wireless setting to use the flash.
15