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Old Sep 30, 2006, 11:18 PM   #1
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Does anyone know why the 580EX flash doesn't fire in Av or Tv modes using a Rebel XT?

It fires just fine in other modes with nicely exposed images but I don't see anything in the manual stating it wont work in Av or TV modes using E-TTL......anyone know what I can do to get auto flash using Av or Tv modes?

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Old Oct 1, 2006, 12:18 PM   #2
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Steve i have the same problem and have the same camera.
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Old Oct 1, 2006, 6:38 PM   #3
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Maybe it has something to do with the sync shutter speed? Try setting custom function 3 to force Av mode to sync at 1/200.
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Old Oct 1, 2006, 11:15 PM   #4
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I don't think that's the problem. I've tried tinkering with a bunch of the custom functions and the only time I would get my 580ex NOT to work on my XT was when I switched the flash mode to TTL. But in that case, it wouldn't work, whatsoever.

It's weird, when I got my 580 it worked just "out-of-the-box". Did you buy it used? Maybe you should try another one...

But I just thought about this now.... like literally now... Before you try another flash, perhaps you should make sure your firmware is the latest version (1.0.3)

Here's the website where you get it.

It might work, it might not... sorry that I couldn't help much
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Old Oct 2, 2006, 6:56 AM   #5
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When you turn the 580EX on does the camera automatically change the shutter speed to an X-sync speed in Av or Tv?

How about the flash icon in the viewfinder? Does it lit-up when the flash is ready in either mode?
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