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Canon ST-E2
Ratio Wireless E-TTL II: MiniTT1
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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.
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