PocketWizard AC7 RF HardShield (Black)
The PocketWizard AC7 HardShield is designed to be used with the Canon 580EX and 580EXII flash units. It shields the FlexTT5 from operation-limiting RF noise generated by these flashes. It provides full access to all flash controls. Its design makes the AC7 a perfect holder for these flash units when using unbrellas or softboxes.