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Old Sep 18, 2005, 8:48 PM   #1
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Let me get this straight.

The way I understand is that if I use one Sigma EF-500 Super flash on my 20D and use another off camera as a slaved unit that they will BOTH provide E-TTL II control?

Please let me know if I am right or wrong.

Thanks!
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Old Sep 18, 2005, 10:54 PM   #2
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The on-camera mounted flash is designated the master and using ettl-ii it can control the output of up to 4 other units, each designated with its own slave flash ID.
(Master or slave id designation is done by wading throught a pile of menus on each of the flashes)

The master unit can set the output power of the slaves, and fire them.

You can mix and match strobes from any vendor, so long as they understand ettl-ii, and have master and/or slave capabilities.

The Sigma 500 DG super and Canon 580ex strobes can act as either master or slave(s).

Peter.
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Old Sep 18, 2005, 11:12 PM   #3
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WOW!

Thanks, Peter.

Now I can understand why everyone is high on the Sigma flash. I only ordered one and will give it a try. Maybe get another.
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Old Sep 18, 2005, 11:52 PM   #4
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PeterP wrote:
Quote:
The on-camera mounted flash is designated the master and using ettl-ii it can control the output of up to 4 other units, each designated with its own slave flash ID.
It's not just 4, but any number !

IMO you got it mixed with the channels #(4) which just means that up to four different photographers can shoot at the same time on their individual channel without interfering onto one another, but any number of slave-flash(es) can be assigned to one channel...

The way it works is there 3 groups A, B, and C (Sigma call them 1, 2, and 3 because Minolta had them this way first, but they work the same) of slaves, and any number of flash(es) can be assigned to anyone of theses slave groups on one particular channel

You can then assign ratio among themselves: http://www.pbase.com/canon550ex/image/23294935

Group C is also unique in that you can also set the flash exposure (FEC) compensation on all the flash(es) in this group from the camera!
... Problem is you'll need a lot of heads -> the more you buy Sigma the more you save :idea:
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Old Sep 19, 2005, 12:08 AM   #5
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:homey: Oups, Peter installs bag over head.
You are right of course. :-)
I did successfully mix up the channels with the groupings.

Peter.
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