Depth of field and f/stops

As promised a while ago, a series of photos showing depth of field and visually explaining f/stops.

For the following photographs I used a Sony a550 DSLR with Sony's 100mm macro lens (SAL100M28).

I kept the same point in focus for all the shots.

1) f/2.8 most narrow depth of field and highest shutter speed.

2) f/4.5

3) f8

4) f/16

5) f/25

6) f/32 widest depth of field and lowest shutter speed.