You can calculate the reolution from the megapixels like this:

    ppi = sqrt(mp * 1000000 * 3/2) * 25.4 / 36

Which gives you:

    6 mp = 2117 ppi
    7 mp = 2286 ppi
    8 mp = 2444 ppi
    9 mp = 2592 ppi
    10 mp = 2733 ppi
    11 mp = 2866 ppi
    12 mp = 2993 ppi