Flash Ratio with E-TTL II
With on sender unit and on receiver unit or two receiver groups, you can set the flash ratio for E-TTL II autoflash shooting
The example below has two receiver units and the sender unit disabled from firing.
![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/580EX II Speedlite/Ratio ETTL II.jpg)
Setting the receiver Units
Two receiver units can be assigned to different receiver groups by setting a receiver ID.
![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/580EX II Speedlite/setting slave.jpg) |
- Set the wireless mode to <receiver>
- Press the
button so that <A> blinks
- Set the receiver ID
- press the
button
- receiver ID <A> will be set
- For the other receiver unit, do steps 1 and 2 and turn the
dial to select <B>, then press the button
- receiver ID <B> will be set.
|
Setting the sender Unit and Shooting
1. Set the wireless mode to <sender>
2. Disable the sender units flash firing
![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/580EX II Speedlite/setting master.jpg) |
3. Press the button so that <RATIO> blinks |
4. Select the flash , turn the dial to select <A:B> then press the button |
5. Set the flash ratio, turn the dial to set the flash ratio |
6. Set the camera and shoot, set the camera in the same way as with normal flash shooting.
- With the EOS ELAN II / ELAN II E / 50 / 50E, EOS REBEL G/500N, EOS IX, EOS IX LITE/IX7, EOS REBEL 2000/300 and REBEL XS N/REBEL G II/EOS 3000N/66, the flash ratio cannot be set with multiple Speedlites
- The flash ratio range of 8:1 ~ 1:1 ~ 1:8 is equivalent to 3:1 ~ 1:1 ~ 1:3 in stops (1/2-stop increments)
- The flash ratio under the
mark is shown in parentheses below the scale
![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/580EX II Speedlite/ratio scale.jpg)