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rebelling_lemming
11th of September 2007 (Tue), 19:01
my mate has one and has no idea what its called. it attaches to your external flash and it makes the flash go off when it detects another flash (coming from the camera)
PacAce
11th of September 2007 (Tue), 19:05
It's called an optical slave trigger. Wein is one of the more popular makers of those gizmos.
FlashZebra
11th of September 2007 (Tue), 20:23
my mate has one and has no idea what its called. it attaches to your external flash and it makes the flash go off when it detects another flash (coming from the camera)
As PacAce indicated they are called optical slaves.

But, in general they do not function properly with Canon EX flash units. They likely work with the new 580EX II.

Enjoy! Lon
rebelling_lemming
12th of September 2007 (Wed), 06:34
well i have a sigma dg500 and for some reason my ebay slave didnt work on it
farrukh
12th of September 2007 (Wed), 08:28
well i have a sigma dg500 and for some reason my ebay slave didnt work on it

It has optical slave built in.
PacAce
12th of September 2007 (Wed), 08:41
It has optical slave built in.

Not necessarily. It won't have an optical slave if it's the 500 ST. :)
Curtis N
12th of September 2007 (Wed), 09:12
... and the Sigma EF-500 DG ST won't work with an attached slave sensor or any other non-E-TTL hotshoe adapter.