It is controlled by the built in flash. **However**, the built in can be set to be part of the exposure OR just to control the remote flash.
Don > -----Original Message----- > From: Joaquim Carvalho [mailto:[EMAIL PROTECTED] > Sent: Sunday, June 19, 2005 2:05 PM > To: [email protected] > Subject: Re: Flashgun for *istDS: Pentax 500FTZ or Sigma EF-500 DG super > > > 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? >
