Hahnel Tuff TTL..
I'm a great believer Phil in testing, noting, and sticking to the formula that I've tested.
In the days of film I was the de facto hospital photographer (was a pathologist). Photographing rashes was a big part of it.
What I used to do by bracketed testing was to work out the aperture for a particular flash at a particular distance with my lens. I then had each distance with a set aperture, all written on a laminated bit of paper on the back of the flash. This never ever failed me, and only could fail with a reflective subject.
I've tested the flashes pointing at the subject without any diffusion and it's too harsh, at least for my wife. I then pointed one upwards with a reflecting card above it and put a handkerchief over the other one. This gave a very nice effect.
I'll use the old Vaseline on the filter trick and all that..
One bit of pressure though is that my daughter just wants quick photos (I am pretty quick)..
My daughter is coming over this afternoon and I'll try and make notes of everything I do.
I'll also of course use my tripod and no flash, but I've already looked at the venue and there's not a great window with a suitable backdrop for window shots with reflectors (that's my favourite portrait setup).
Will post some shots, good or bad, early next week!.
I'm not worried about doing weddings, but they are pressurising. I've two cameras, each with twin cards., 3 flashes, and two tripods.
Will use 24-105L, Sigma 70-200 OS, maybe 17-40 L and will take 50 f1.4 and Sigma 300 (my favourite lens, even for portraiture).
I actually have far too many lenses and normally restrict myself to 24-105, 80 f1.8 and 50 f1.4.