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Old Apr 5, 2006, 11:02 AM   #1
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I have narrowed it down to between SIGMA EF-500 DG and the CANON SPEEDLITE 580 EX.I have a 20D Canon.Now is there anything that the canon can do that the Sigma cant do?If there is something is it worth the $140 difference?

Any Help would be great.



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Old Apr 14, 2006, 2:14 PM   #2
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I would re-post this in the Canon DSLR forum.
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Old Apr 21, 2006, 3:57 PM   #3
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Just a thought, I could be wrong but can the Sigma act as a master with up to three slave groups?

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