Hi,
There are some cheap pre -flash aware slaves, though obviously do not
coordinate with digicam for ttl control. The one below develops dementia after
being turned off and has to re learn the preflash. This really PO'd one
reviewer. There are probably better choices, though this is quite inexpensive.
I have not tried it.
Mike
http://www.bhphotovideo.com/bnh/controller/home?O=productlist&A=details&Q=&sku=317047&is=REG&addedTroughType=search
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