Canon 2478A002 manual Setting the AB Flash Ratio, 3Camera and Slave Positions

Wireless Multi-Flash E-TTL Autoflash Operation

(2)Setting the A:B Flash Ratio

The flash ratio between slave A and slave B can be set to specify the main flash and fill flash. The flash ratio can be set from 8:l to 1and from 1 to 1:8 in half-stop increments. In terms of exposure stops, it ranges from 3:l 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.

(3)Camera and Slave Positions

Position the ST-E2-attached cam- era and the two slaves to obtain t h e desired lighting effect. See page 26.

Check t h a t t h e ST-E2's main s w i t c h i s s e t t o c I > , t h e n press the <RATIO > button.

T h c f l a s h r a t i o control l a m p lights in red, and the respective flash ratio indicator lights.

The flash ratios for the unmarked indica-

tors ( are shown in parentheses below.

Press the < 4 > or < b > but- ton to select the desired flash ratio.

0If the main switch has been set t o < I >, t h e b u t t o n s will not work. S e t t h e main switch to

<HOLD >.

The modeling flash can be fired to see the lighting effects before the picture is taken.

(4)Follow the basic proce- dure for wireless E-TTL autoflash exposure to take the picture. See page 26.