garyrhook wrote: As stated, it depends upon viewing distance. You don't look at seven foot wide image from two feet away (to enjoy it).
One could probably get away with 150 dpi for something like that, but that still means > 100MP. 4 shots with a D850, stitched together, would do the trick.
At 300 dpi, that (almost) 5000 square inches would require 450MP.
N.B. medium format cameras are used to produce images for billboards.
Ian Stone wrote: Unless you use your iPhone. LMAO. Seriously didn't apple claim a few years ago that they made a billboard photo using an iPhone?