Canon Ratio Wireless E-TTL II MiniTT1 OOFlexTT5 cont’d, General E-TTL II Considerations

Ratio Wireless E-TTL II: MiniTT1 OOFlexTT5 (cont’d)

General E-TTL II Considerations

There are several important factors to keep in mind when using the ControlTL system to extend Canon’s wireless functionality:

•Operate the camera normally by pressing the shutter release button halfway to establish focus or metering before shooting. On some Canon cameras, pressing the shutter release button too quickly before camera wakeup may cause the pre-flash to miss or cause an

over/under-expose. Canon ST-E2

•The range of Canon’s E-TTL II ability to measure light may be exceeded by the range of the ControlTL

system. In other words, it is possible to place Speedlites so far away that the camera cannot accurately measure their light in the frame. Adjust your remote flashes to light the subject better so the camera can make a proper exposure calculation.

•Angle of operation is extended. You can place flashes in more places, including behind you, than allowed by Canon’s light pulse system.

•Consider your metering mode carefully: center-weighted, evaluative, spot, etc. When pushing the envelope of flash distances, you need to be sure you craft your remote lighting in a way that works with your metering mode.

•Review the Troubleshooting section for more information.

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