Firing only one flash tube
- With Type-A cameras other than the EOS-1V and EOS-3, the flash ratio cannot be set. Flash tubes A and B will fire at the same output. Or, you can fire only one flash tube
- Pressing the <RATIO> button will not display the RATIO icon and flash ratio. Selecting the left or right tube will fire only one of the flash tubes. When tube icons are displayed, flash tubes will fire at the same output.