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FORUMS General Gear Talk Flash and Studio Lighting 
Thread started 31 Oct 2007 (Wednesday) 21:44
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Cactus V2s and Sigma EF-500 DG ST problem

 
zasboy
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Oct 31, 2007 21:44 |  #1

Hi all. I recently bought the Cactus V2s(1 transmitter, 2 receivers) from Gadget Infinity. Link can be found here:
http://cgi.ebay.com …eName=STRK:MEWA​:IT&ih=007 (external link)

As you can see, the description said it is compatible with a Sigma EF-500 DG ST. So here's what I did.

- I set the transmitter channel to 1-2(both on)
- I set the receiver channel to 1-2(both on)
- Inserted battery into receiver
- Mounted the Sigma onto the receiver
- Turn both Sigma and receiver on
- Press test button on the transmitter

I see the red LED blink on both receiver and transmitter but the Sigma did not go off. I tried mounting the transmitter onto the 30D and tried various shutter speeds to see if i can get the Sigma to flash but no luck. I tried different settings on the Sigma such as TTL, ML, and MH with no luck.

Strange though that the Cactus V2s works fine on my Dad's Canon 580EX. So I'm at a stump on what to do and asked if anybody had any problems with getting the Cactus V2s to work on a Sigma EF-500 DG ST.

I did send an email to Gadget Infinity. So hopefully they would respond back. I also checked google and various sites but they all related to the Sigma EF-500 Super which didn't really help me.

-Thanks




  
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Curtis ­ N
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Oct 31, 2007 22:11 |  #2

I believe the E-Bay ad is incorrect.

As far as I know, there is no way to fire the Sigma ST flash other than on an E-TTL hotshoe. A garden variety hotshoe adapter with a PC cord will not work either.

The only way to make the Super model fire this way is to put it in optical slave mode, and the ST model does not have this capability.

Sorry to be the bearer of bad news. I think you're a victim of false advertising.


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Cactus V2s and Sigma EF-500 DG ST problem
FORUMS General Gear Talk Flash and Studio Lighting 
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