How to Configure PocketWizard Controllers for a Multi-Flash Set-up
Learning how to configure PocketWizard controllers for a multi-flash set-up can be quite confusing, but with a few tips the configuration can be done without too much trouble. There are a few basic steps that need to be taken to achieve the desired configuration. It is important to follow these steps.
Step 1: Set Up
Use the ST-E2 as your Master and then use the 550EX as the Key. Use the 420EX as Fill and then use the 580EX as the Background. Once this has been done, you can start arranging lights on various light stands and then configure them.
Step 2: Arrange the Light Stands
All the Speedlites have to be set to the same channel. Follow this up by setting the ST-E2 for A:B ratio of 4:1. Next, set up the 550EX as the SLAVE A and do so in auto exposure mode. After this step has been taken, you need to understand that the 420EX will only SLAVE while it is in auto-exposure mode. So, it pays to set it to SLAVE B.
Step 3: Set 580EX
After completing the above steps, you should then set the 580EX to SLAVE while also using fixed-power override mode, which can be done by pressing and holding the 580EX MODE button for half a minute.
Step 4: Adjustment
The last step is to press the push button lying in the middle of the control dial and also give the dial a twirl so that the flash power is properly adjusted.
Once this setup is done, make use of FEL to check that communication is established and also to check for out of power, if it exists. All this can be summarized in the form of: [ST-E2 =t: 550EX=a4: 420EX=a1:580EX=m/2].