Can somebody explain the flash exposure reading in the EOS-3 viewfinder.  Do 
you have to adjust the shutter speed when using the 550ex flash in AV mode?  
Does the camera and flash automatically balance flash output for fill or main 
flash depending on what aperture you use?  and if you have a to small an 
apeture will the camera give you an under exposure warning, so to use slow 
sync?

Thanks
Lee
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