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TTL
Basic Wireless TTL
Next recommended reading: Advanced Wireless TTL
This section talks about Basic Wireless TTL where all Speedlights are used as one zone of camera-controlled light
and not independently controlled using zones, groups, or ratios. Read Advanced Wireless TTL for independently
controlling different groups or zones of TTL flash, or for working with ratios. You may also want to read about
Manual Flash.
Make sure you read the Getting Started section first!
All references to TTL on this page refer exclusively to Canon's E-TTL II system, or Nikon's i-TTL/CLS.
Film TTL or earlier digital TTL systems are not supported.
"Speedlite" and "Speedlight" are used interchangeably. Either may be used to refer to Nikon or Canon's hot shoe flashes. Nikon or Canon specific
information will be noted as needed.
REMINDER: Speedlights mounted on a remote FlexTT5 should be set to their standard i-TTL/E-TTL mode. Do not use <MASTER>, <REMOTE>
or <SLAVE> modes on a remote flash.
General TTL Considerations
There are several important factors to keep in mind when using the ControlTL system to extend wireless TTL:
• Operate the camera normally by pressing the shutter release button halfway to establish focus or metering before
shooting. On some cameras, pressing the shutter release button too quickly before camera wakeup may cause the
pre-flash to miss or cause an over/under-expose.
• The range of Canon or Nikon’s TTL 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 or Nikon’s light pulse system.
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