Setting the A:B Flash Ratio
The flash ratio between receiver A and receiver B can be set to specify the main flash and fill flash. The flash ration can be set from 8:1 to 1 and from 1 to 1:8 in half-stop increments. In terms of exposure stops, it ranges from 3:1 to 1 and from 1 to 1:3. When the flash ratio is set, E-TTL autoflash metering controls the flash output to obtain a correct exposure.
![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/ST E2 Speedlite Transmitter/Untitled-22.jpg)
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Check that the ST-E2's main switch is set to ON then press the <RATIO> button
- The flash ratio control lamp lights in red and the respective flash ratio indicator lights. The flash ratio for the unmarked indicators are shown in parentheses below
![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/ST E2 Speedlite Transmitter/Untitled-21.jpg)
Press the button to select the desired flash ratio
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![](/library/attachments/ServiceWareImages/LDImages/SolutionAnswer/ST E2 Speedlite Transmitter/Untitled-17.jpg)