Below now is the fully processed and PS JPG that the client is purchasing. There is not a tremendous amount of difference because I got the original capture pretty close to what I wanted. But I lightened faces a little, darkened background, some of the walkway, and a little exposure layer adjustment and burn.
My starting point was an incident reading (dome over sensor, facing towards camera), with my 30 year old Sekonic analog hand held meter. That reading would approximate their faces which are in shadow. I'd selected an ISO of 200. I could have just as easily used 100, but kept changing to 400 so I only wanted to keep an exposure difference of 1-stop. I'm mediocre at math, but with only a 1-stop difference even I can do that in my head when quickly changing camera settings.
The EXIF says no flash, but in fact I did fire the 580ex. I don't know why the EXIF reads that way. I use the off camera cord.... perhaps that has something to do with it. But I did bump the flash output up around FEC +2/3 or thereabouts. By increasing the flash output, that brings the facial exposure closer to the sunlight exposure, but not the same.
With extreme lighting like this, you can see how T, AV, P or any of the automatic exposure modes could be completely fooled and give you a lousy exposure. Aim the lens at the background, the tux, the dress..... you will get very different readings. And that can't be tolerated in a situation like this. It has to be a fixed unchanging exposure if you want consistent, repeatable results. That is why I will use the camera in MANUAL mode, and shoot RAW.
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