Hmmm, interesting question. The question is whether the pc flash will pre-fire under E-TTL. The pc cord connected flash cannot be power-controlled by the camera so you will have to set the manual power and if you set it to high it will not have enough charge to flash during the main flash. If it does not fire during pre-flash it cannot be figured in the exposure computation. Either way I don't see how e-ttl can work well in this setup.
Straight TTL might work however, since the exposure is controlled during the main flash. The in camera meter will sense light from both flashes and will control the canon flash to create the proper exposure. Of course it is possible that the pc flash will be too close , or too far away, to allow a proper exposure but you can control this distance. The complication is that you will have to run your guide numbers on the pc flash to determine which flash will be providing the 'filling' since the canon flash could be main or fill depending on the distance of the pc flash. The best way , it seems to me, would be to go manual on both flashes and run guide numbers on both. You can set the flash exposure on both flashes with distance from the subject and power output on the flash. You could also try the Sigma EF-500 , it advertises canon wireless compatibility for $179 from B&H. Joe. -----Original Message----- From: Birnbach Michal [mailto:[EMAIL PROTECTED]] Sent: Wednesday, June 12, 2002 5:12 AM To: '[EMAIL PROTECTED]' Subject: EOS 3 & external flash - advice needed Dear All, I have the following problem which I cannot solve based on the manual. I use EOS 3 and two flashes: 550EX and 380EX . One flash is connected directly to the camera. Second flash is connected using a standard (non-Canon) cable to the socket for external (non-Canon) flashes (e.g. studio flashes). What I do not know is if EOS 3 during light evaluation takes this second flash under consideration. In other words if I have Av mode turned on the main flash will fill-in and the second flash? Will it also fill-in so the picture is taken properly or will it just "fire" and the picture is overexposed? Does E-TTL or TTL work with second flash? I'd be gratefull for any help. Unfortunately I do not have money to buy second 550EX to use remote control of both and I still would like to have two sources of light. Best regards, Michal Birnbach * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
