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| p.1 #3 · TTL cord with AF assist light? |
The only marginally similar item that Canon has is the ST-E2 transmitter. Unfortunately, this does not allow you to have an ETTL flash on camera should you so desire.
That said, for indoor use in a relatively reflective room, Canon's IR ETTL signal will let you control your off-camera flash units without a cable while providing a better AF-assist solution.