automatic or manual external exposition for flash

Started Jan 5, 2009 | Discussions thread
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SEBOUNET
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automatic or manual external exposition for flash
Jan 5, 2009

With the 50D, you could use this feature with 580 or 430 exII, you can make an exposition , using a grey card.

What is purpose of this, because if it does like a white balance it doesn't seem to be stock somewhere ?

What this advantage of External exposition ?

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