william_tucron

<p>I agree with Jos. I think the most likely cause of the problem is that CF 7 has external flash disabled. I've used 540-EZs on my 5D for years with and without remote triggers. As Jos suggests the first test of the state of CF 7 is to try firing the flash in the hot shoe. But I will also add that I found several cheap ebay flash trigger to be highly unreliable. I finally bought some better quality stuff.</p>