Canon 550EX in manual mode can't trigger an optical slave?

Started Mar 7, 2013 | Discussions thread
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jeffinvan OP Forum Member • Posts: 57
Re: Canon 550EX in manual mode can't trigger an optical slave?

Okay, finally got the answer direct from the horse's mouth (Metz.de).

Apparently, in either slave mode (Wireless Servo "M/SL" or Wireless Slave "SL), the source must be a P-TTL flash thus my ability to trigger off the on-body camera flash but not flash unit set to full Manual mode.

Guess that means I need another trigger!

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