Stop in for a cup of coffee

10 mp might be fine depending on the quality of the optics. Lenses and image receptors can make a big difference. If those don’t make up for the limitations of 10 mp, then postprocessing manipulation of the image will be required to make it suitable for large format poster printing.

I was thinking about like 11x17 inch poster, twice the size of a 8.5x11 inch letter size. Of course, it would be nice with a larger poster too, but the 11x17 size is a fine size for me. I can print out on the printer at home regular letter size picture on glossy photo paper, but that is a little small.

Bill