Autoflash with Three Receiver Groups

Once firing groups A and B have been set up, you can fire with multiple Speedlites by adding group C. For an overview of flash control, see Group Control.

Group C is useful when you want to eliminate shadows in the background behind subjects.

  1. Push the joystick straight in.

  2. Select the item shown in (1).

    • Press the joystick vertically or horizontally or turn Select dial to select the item, then push the joystick straight in.

  3. Set to A:B C.

    • Press the joystick horizontally or turn Select dial to select A:B C, then push the joystick straight in.

  4. Add Speedlites to firing group A, B, or C and position them.

    • Check whether all the receiver units are set to the same transmission channel as the sender unit.
    • Set up receivers for group A, B, or C and position them.

  5. Check the transmission channel.

    • If the channels of the sender unit and receiver unit are different, set them to the same number ().

  6. Set the A:B flash ratio.

    • Push the joystick straight in to select the item shown in the figure.
    • Press the joystick horizontally or turn Select dial to set the A:B flash ratio, then push the joystick straight in.

  7. Set the flash exposure compensation amount for firing group C.

    • Push the joystick straight in to select the item shown in the figure.
    • Press the joystick horizontally or turn Select dial to set the amount of compensation, then push the joystick straight in.

  8. Confirm that flash recharging is finished.

    • Check that the sender unit's flash-ready lamp is lit.
    • Check that the receiver unit is fully charged.

  9. Check operation.

    • Press the sender unit's test flash button.
    • Firing groups A, B, and C will fire. If it does not fire, check that it is placed within the operation range.

  10. Take the picture.

    • Just as in normal flash photography, shoot after configuring the camera.

Caution

  • To fire the three groups of A, B, and C, set to A:B C. Group C does not fire when Speedlites are set to A:B.
  • Aiming the units in firing group C directly at subjects may cause overexposure.
  • With certain EOS film cameras that support E-TTL autoflash, you cannot perform wireless multiple flash shooting with a flash ratio setting.
  • If there is a fluorescent light or computer monitor near a receiver unit, the presence of the light source may cause the receiver unit to malfunction and fire inadvertently.

Note

  • You can fire the modeling flash by pressing the camera's depth-of-field preview button ().
  • To turn on a receiver that is in auto power off mode, press the sender test flash button.
  • Test flash firing is not available while a camera's flash timer or similar functions are active.