The funny thing is that I knew the 3-prong outlet was for a battery pack, and I was trying to wrap my brain around why I would connect a transceiver there! Anyway, I am going to order the correct receiver for the hot shoe flash today, which was generously linked to in the comments above.

So, thanks for the help in jogging my memory all – hopefully at least some of the shots of the Cactus gear with the dorky labels gave some of you a few chuckles…

hope this helps.

Glups… Just to say, I wanted to say the same. I was just few minutes ago. Hesitate to buy an old 550Ex and Cactus (but really V2s). And read so much report saying that this couple is OK but with something like 50% of OK fires (some didn’t .started and other strated free…) Just look google for “+V2s +550Ex”.

So, will wait your report with 550EX before buy something like that.

Hope you could send it back !

-Fred

The three-prong outlet on your 550EX is for an external power pack, not for a radio remote. The system you bought is actually built for studio strobes (white lightnings, alien bees, elinchroms, etc.) and not for speedlights. The system Gadget Infinity sells for your 550EX is here

If you had a Nikon strobe or one of the new 580EX II units you would be OK because they have the PC connection built-in.

Hopefully that helps. Shoot me an e-mail if you have any other questions.

-Stephen