New answers tagged speedlite
The 600EX-RT and 430EX III-RT both work with optical triggering and the newer radio triggering system (although you can only use one system at a time). Chapter 5 in the 600EX-RT manual(pdf) covers setting the 600EX-RT up as either master or slave using optical control. There manual for the 430EX III-RT isn't available yet, but the product page tells us: ...
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