Les Berkley , Jan 19, 2010; 02:29 p.m.
Well peep my pixel, here we go again. Does this happen with other lenses? Does it happen at other focal lengths with this lens? What AF setting did you use--'spot' has no meaning. Is it doing this if you focus manually? Most importantly, I see that your lens is NOT positioned perpendicular to the test chart. Note the position of the near 30mm markings to the lower edge of the frame.