I think the external one does react to the pop-up one. Something like a small fire to begin and another one to stop.
What I'm sure of is that you can choose between a couple channels so your flash does not fires if the guy next to you uses a similar setup. However, be advised that the Sigma one doesn't work with the D popup (nor the DS which doesn't even suport this feature). But if you have a Sigma on the camera and the Sigma handheld, it'll work alright. The 360FGZ has the advantage that it can play nicely with the pop-up flash. 2005/6/19, Joaquim Carvalho <[EMAIL PROTECTED]>: > Thibouille wrote: > > >>Wireless TTL - what is it and how does it work? > >> > >you get TTL without the need for cords everywhere. eg you can just > >have the flash in your hand and body in other hand you still have TTL. > > > > > How do the camera and the flash comunicate? Radio signals? Or does the > external flash follow the pop-up camera flash? > > -- ---------------------- Thibouille ---------------------- *ist-D,Z1,SuperA,KX,MX and KR-10x ...
