Can a T5i trigger a 600EX-RT flash by 'radio' when the 600EX-RT is off the camera?

[RobertTheFat]

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@Waddizzle wrote:

I though the 430EX III-RT could not be used as a radio master/transmitter, only as a reciever. 

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Yeah, that's what I thought too (which is why I weasel-worded my suggestion). But while I have a 600EX-RT, I've never used (or even seen) a 430EX III-RT.

[TTMartin]

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@Waddizzle wrote:

I though the 430EX III-RT could not be used as a radio master/transmitter, only as a reciever. 

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The 430EX III-RT can function as a Master or Slave when in radio wireless, but, can only function as a slave in optical wireless.

From the user manual.

[Waddizzle]

I assume that far right column header has a typo.  Shouldn't it be 430EX II?  BTW, B&H is sold out of 430EX IIs.

[TTMartin]

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@Waddizzle wrote:

I assume that far right column header has a typo.  Shouldn't it be 430EX II?  BTW, B&H is sold out of 430EX IIs.

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There is a 430EX III (non-RT) for sale in countries where the radio trigger would be illegal, due using radio frequencies. 

 http://gdlp01.c-wss.com/gds/0/0300019910/01/sl430exiii-rt-im-en.pdf