here is the set up.

Graphic view II 203mm/7.5 Optar with (X) sync Graflite flash mounted horizantal on front standard 1 flash on both ends. Vivitar 285 Vivitar 283

Both flashes have auto/manual modes. Would I set the 285 to an automode that correspondes to my 12 foot distance, the n set the 283 to the same automode?

So both would be on an automode that corespondes to a certain fixed distance and f-stop? Then the flashes automode will take care of the rest? Or will I need to compensate for dual flashes.

Will I also have to compensate for bellows extension.

I guess the easy way would be to use a flash meter.. Which I don't have. I hav e a minolta III if that would be any help.

thanks