Now that I think about it, nearly all phones can be flashed, and nearly all of them have cameras. Perhaps there is code that can run the camera as a light meter.
I have resorted to using my Kodak c875 for light metering, as the computer does a really good job, but the Schneider-Kreuznach Variogon only opens to f2.8 --respectable lens that it is(!)-- making photography difficult.
BTW, it lives. I hadn't seen it in the stores on Kodaks so I assumed it went belly-up, and said so on RFF.
But no, still on the Kodaks, and presumably the sensor Kodak made for the Leica will migrate behind a variogon so we can take Leica quality picts for a hundred bucks! Oooo, the feeling 🙂