Garyminor wrote:
Here is a reply from Yongnuo.
Dear User,
Thanks for contacting us!
We are sorry to tell you that YN600EX-RT doesn't support optical wireless function as master, it can only be used as a slave flash when using optical wireless function.
Thank you very much for your great support for YONGNUO products! If you have any other questions, please feel free to contact us again.
Best regards,
YONGNUO
Thank you, but the distinction seems to be radio vs optical, rather than master ability. Is that correct?