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| p.1 #2 · Experience canon 580 EX II fails to trigger Canon 430 EX as slave? |
I would start my troubleshooting by moving the flashes a litte further apart, setting the 430 to manual mode, and turn the power all the way down. Also, make sure the 430s wireless sensor (red vertical widow right below the head) is pointing toward the master flash head and is not in the head's shadow.
Try waiting 10 seconds or so between triggering the master.