The camera angle appears high, about at eye level, so I might speculate that it was hand-held, not tripod-mounted.
The picture appears naturally lit, not flash-lit.
How, therefore, have you excluded camera shake as a potential source of lack of sharpness?
Also, if the pretzel bag was what you focused on, you must have reframed, since it is not in the centre of the shot. Either that, or the camera may have chosen an AF point other than the centre to focus on.
So how are you sure that the camera-to-subject distance hasn't changed between focusing and shooting, or that the camera isn't in fact focused other than at the centre of the frame?
What exposure and aperture did you use?
Last edited by ChrisA; 01-25-2008 at 01:25 PM.