ahh. that makes perfect sense. Thats what I did because I knew If I recomposed the picture in Av mode, the camera would change for the current scene. Manual I had control so the only variable at that point was the what power to set the flash to. I already figured out what the ambient needs to be when I aimed at the sky and noted the shutter speed.
WOW, when you break it down like that it's almost seems easy in a way. Now to get the experience so I can predict what power the flash needs to be set to. Once I figure that out I should be all set
Best,
Jay