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.
Reinforced 1/4-20 threaded attachment points and included umbrella holder make the AC7 a perfect flash holder when using light-stand mounted umbrellas or softboxes.
The AC7 design allows use of various flash-head mounted light modifiers and is excellent for use with a lightstick or monopod.