Features

• Compatible with 420EX, 430EX, 550EX, and 580EX flashes 
• Compatible Cameras: Type A EOS cameras (E- TTL, autoflash); type B EOS cameras (Manual flash) 
• Flash Ratio Control: For A:B ratio: 1:8 to 8:1, in half- step increments or 13 steps 
• High- Speed Sync (FP flash): Enabled with high-speed sync mode 
• Slave Operation Confirmation: With test transmission button. *Slave A fires followed by slave B at 1/64 output 
• AF-assist Beam: Compatible with EOS-3's 45-point Area AF and 28mm and longer lens focal lengths 
• SE Feature: While the power switch is set to I or HOLD, the transmission turns off automatically after about 90 sec. of non-use