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Message: <blockquote data-quote="WayneF" data-source="post: 112351" data-attributes="member: 12496">There is not a way though.  It is not helpful to know for TTL, sufficient that it comes out right.  Watching recycle time will tell you roughly if it was near full power or not (important indicator for bounce).So, you come at it another way.   Indoor portraits, ambient is insignificant (hopefully, because it is usually orange).  You set aperture for flash power and depth of field, and set shutter speed fast (maximum sync) to control any traces of ambient.  You set flash power either with a flash meter, or by trial and error, to make your picture come out like you want it. Trial is easy for one flash, but if using multiple flash, you really want a flash meter, to set the lights up.   You can't get there from iTTL.</blockquote>