We have recently used a Nikon D300 to produce a 30x50-foot billboard.
Our client is happy, invited us for lunch, and ordered the production of
two but smaller billboards of same image. So, based on our experience, a
12mp camera is sufficient for this size.
There are other factors, of course, that affect the quality of the
photo: composition, colors, etc..
David Dyer-Bennet wrote:
Does the 20+ MP actually matter? I've seen billboard material close up;
it looks like it's something around 8DPI. Which means your 12MP produces
something like a 30 foot image. (I don't know this area of business much
at all, so the billboard material I've seen may be anomalous.)
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