Slave Canon Rebel T3i with Speedlite 580EX

f/20
ISO 400
shutter speed 1/64 sec.

Set Up: Pop up built-on camera flash and set up flash with umbrella toward the front, right side of subject.

Camera Settings: Hit the Menu button. Go to the first Red Camera icon in the top row. In the column of selections, choose Flash Control with the middle set button. Then choose Built-in flash function setting. The Built-in flash should be set at CustWireless. The Flash mode should be on E-TTL II. Finally, select the Wireless function and choose the second option.

Flash Settings: The flash mode should be set at ETTL. There are three wireless flash options under E-TTL Automatic. Press and hold the Zoom/Wireless Select Button. Turn the Select Dial to Wireless [On - Slave] mode. Press the Select/Set Button.