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450D won't trigger external Sigma 530 DG Super with E-TTL cord. Why?

Started Mar 19, 2012 | Discussions thread
Y0GI Veteran Member • Posts: 5,257
Re: 450D won't trigger external Sigma 530 DG Super with E-TTL cord. Why?

It could be a design problem. The camera and flash communicate by exchanging rapid pulses of electricity. High frequency communication and long cable lengths don't always make a good combination. It could be an impedance mismatch, or maybe the cable should have used twisted pairs of wires and they did not. Hard to say, but it sounds like you have given it a fair chance. The only other thing to try that I can see would be to see if the cable will work with a Canon flash. If it does, then your flash is the problem. If not, I would send it back and ask for a refund.
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