If I understand your setup correctly then yes, the -2 fec would be applied to the 420 as well. This assumes that the 420 is setup via a ttl cord.
If you want different power levels from your combination the the Sigma flash would either have to be capable of a separate fec setting or be set for manual flash at a level that gives two stops less light. Another way you could approximate that -2 balance would be to set no fec on the camera and put a diffuser over the Sigma that would reduce its effective output by two stops. Joe. > -----Original Message----- > From: Alex [SMTP:[EMAIL PROTECTED]] > Sent: Monday, October 22, 2001 11:58 AM > To: [EMAIL PROTECTED] > Subject: EOS Wireless E-TTL and FEC > > Ok, I don't own a second flash yet (I'm going to buy the Sigma EF 500 > Super > as soon as funds allow), but I was wondering about how flash exposure > compensation works in a 2-flash situation. Here's the scenario: the EF > 500 > would be on the camera, and the 420EX would be on a stand or something, > off > to the side. I want the 420EX to be the primary light (for sidelighting), > and the EF 500 would just provide some shadow fill and a catchlight in my > subject's eyes. To achieve this, my first thought was to dial in -2 stops > of FEC on the camera body. > > However, would this then make the off-camera 420EX be at -2 FEC as well? > Or > would the FEC apply only to the hotshoe flash, and the 420 would make the > correct exposure automatically? Would setting FEC on the EF 500 itself > make > any difference? The 420 doesn't have any manual controls, so I can't do > anything there... > > Geez, I'm confused, and I haven't even started doing anything yet! ;-) > > --Alex > > * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
