Thanks Gareth, I learned a new English word tonight. I knew the name 'Soft Shield' so I missed that vital bit of information given by Meddin Studios.
The Soft Shield was the first product to keep in the noise emitted by the flashes away from the PocketWizards and if remember well it was not as effective as the Hard Shield. If you use external power for the flashes then only the Soft Shields could be used.
I don't have any problems and I own a 580EX first model and where I life an other frequency is used to control the PocketWizards.

























