Owner`s manual

Canon ST-E2

Ratio Wireless E-TTL II: MiniTT1

FlexTT5 (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-ash to miss or cause an

over/under-expose.

• 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 ashes to light the subject better

so the camera can make a proper exposure calculation.

• Angle of operation is extended. You can place ashes 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 ash 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.