420ex flash help!

Started Dec 15, 2012 | Questions thread
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Mrs Mc New Member • Posts: 3
420ex flash help!

Hi there,

I'm using a 20D and I have a 420EX flash.  I just bought a couple of cheap slave flashes which fire when I press the pilot button on the 420 but don't fire when I press the camera shutter (though the 420 fires).  What am I doing wrong??

ANSWER:
Canon EOS 20D
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