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Can a Canon EX III-RT trigger an EX II?

I tried to conect them but was not unsuccessful. Is it possible to connect them at all?

2
  • Do you mean the 430EX III-RT and 430EX II? There are other "EX II" models such as the 580EX II.
    – Michael C
    Dec 26 '16 at 22:32
  • Having a programming background, where for almost everything has some open source solution or a protocol is public available I found the flash receiver situation pretty disappointing. Even the same manufacturer is unwilling of providing backward compatible remote triggers for its products. After buying expensive canon flashes I switched to Yongnuo, for the much lower price you get a similar product but don't feed Canon the cash for the IMHO overpriced flashes. Buy the Yongnuo YN-E3-RT trigger and for the old flashes buy the YNE3-RX trigger. This way you should be able to trigger both flashes.
    – floriank
    Sep 26 '17 at 22:32
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No. The presence of a radio receiver in the flash is denoted by the RT in the model name. Models without an RT in their name do not have radio receivers.

You can either:

  • Attach a radio receiver to the EX II flash. The Yongnuo YNE3-RX is such a receiver that is compatible with the 480EX II, 580EX II, YN568EX II, and other E-TTL capable flashes.

or

  • Use a master flash with optical communication to the off camera flash. Unfortunately the EX430 III-RT is not capable of being an optical master, only a radio master. If you have a 580EX II you can use it as an optical mater to trigger the 480EX III-RT optically, but not by radio.

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