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No, you will not get the full functionality of the 600EX-RT/ST-E3-RT system with your XS. But you will get all the functionality you would have with the 430EXII or a 580EXII over optical--most notably, remote power control, eTTL, and high-speed sync. The Canon RT radio system added some functionality to the older optical triggering system that you can ...


You'll certainly be able to use ETTL with the 600EX-RT and ST-E3-RT. However, you won't be able to use the ST-E3-RT to control your 430EX II units, as it lacks optical triggering. You could use the 600EX-RT to control those 430EX II's optically, including using ETTL, but that kinda defeats the purpose of buying the radio-capable units. Some options: Skip ...

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