Since some people seemed to have some doubts about what changing the aperture settings on the camera does for a photo, I did this little animated .gif from a sequence of photos I took a few days ago :
As you can see, the camera was focused on the closest spot (the tip of the handle is always in focus) and at that distance, taking a shot with f/2.8 (effective f/3.2) results in a very shallow depth of field - practical result of which, the head of the razor is out of focus. As the aperture increases, so does DoF, which ends up in a picture that has the razor almost totally in focus.
So does this mean we should always take the shots at f/32 ? as always, it depends There are downfalls for such small apertures, and in most lenses, you start to lose sharpness after f/16 because of all the light difraction inside the lens (you're taking a photo through a pinhole). Also, as the aperture increases the shutter speed decreases which will result in having to have a tripod or something similar for the long exposures.
Hope that helped!