Off-Topic - advice, experiences and examples, for images that will be processed in PhotoLab

Yet another off-topic question, which I suspect none of you have an answer to, as you most likely don’t use an on-camera flash.

Anyway here goes. I haven’t used an on-camera flash since back in the 1980’s, on my Nikon F4. I bought a Nikon SB-800 flash, (in the 1980’s) and used it mostly to photograph machinery, and occasionally, people.

I just got back from India, and people were often asking me to take a group photo, with them in front of an important scenic view. Invariably, the photo came out awful, with a beautiful background and very dark faces. My old Nikon D750 had a pop-up flash, but neither my D780 or my Df has a built-in flash.

I’m assuming that most people here take their precise photographs with only available lighting. That’s what I was expecting to do, shooting only with available light. When people wanted a photo, I would take an ugly photo with black faces in front of a beautiful background, show it to them, then explain I need to re-take the photo with the light behind me. Then a got a good photo of the person or more likely, people, and they were happy - while I felt frustrated.

Do any of you have a suggestion for what kind of electronic flash you recommend - if any. My SB-800 works perfectly on my Df, but seems to be incompatible with my D780, meaning I’ll likely buy something new - but if the color settings are off, that might be a nightmare to correct in PL. Maybe the flash I want/need will be very expensive.

(Speaking of my trip, I was the only person there, in our large group of photographers, who wasn’t using Lightroom. Also, I took my Df, not the better D780, as I wanted to learn what the Df was capable of. The advice I was given here long ago, to only use my D780 proved very true, as having the additional pixels, and larger batteries, and a flip-up-down viewing screen I really missed. Yeah, all of you were right, in retrospect. All the other photographers had a D750, and they all wanted to use my Df.)