The recommendation for printing images seems to be they should be printed at 300 dpi, so if I have a 12 Megapixel images in 4:3 format that would limit me to 12.5" x 10".
My question is if I have a really good lens and the image is totally in focus even when zoomed in to its pixels limit does that allow me to print at larger size or is the 12.5" x 10" limit the max size if image totally in focus.