miles747
28th of August 2004 (Sat), 08:02
I have set up my Canon 10D with a master 550EX and one slave 550EX. I have successfully tested the slave in my home and outside on a wooden deck. However, when I attempt to use the master / slave configuration in a 75 year old stone church with a very high ceiling and stone floor, the slave unit fires approximately 10% of the time (both when shooting actual photos or just pressing the test button on the master). I am using new batteries in both flashes, recharged battery in the camera and have tried both channel 1 and channel 4 in the master and slave units. I also swapped the master unit to the slave and the slave to the master with no change in the results. Master to slave distance is less than the recommended 8 meters. As a side note, I encounter this same problem when shooting outdoors (on stone steps) in front of this church. Any suggestions on what I am doing wrong.