thanks so far. If I were to meter one at a time, then when they all fire, won't that change the exposure as one flash will "overlap" the other increasing the exposure?
for example, if I took a reading of f8 1/60 for the main flash, and then measured the fill for a stop under, when I fire both at the same time, won't the parts of the portrait that receives both lights measure brighter, and not be one stop difference anymore?
yup, I know I sound confusing but this subject is confusing to understand for me
both answers are on the right path....
thanks again
randy