Turning the Master Flash off so just slave fires 580ex2

Camara Photography, LLCCamara Photography, LLC Registered Users Posts: 82 Big grins
edited April 1, 2009 in Accessories
I want to fire JUST the slave (580exII), from the on camera Master (also a 580exII), without firing the on camera master.
I have read the manual a million times... and yes, I'm aware of the Pre-flash...

Here's what I'm doing:
I'm starting with the Master "On", and all works as designed (master fires, and slave fires, simultainously):
To turn off the master, I hold the "zoom" button down for two seconds and the Master "On" & the lightning bolt flash. I turn the dial so it says "off", and hit the set button in the middle of the dial. Here's where the frustration starts... The manual (pg 39) states that at that point the flash head symbol and the lightning bolt should remain visible. IT DOESN'T, and the slave doesn't fire (I hold the slave 1' in front of master for the is test)

What am I doing wrong???

Thanks.
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