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Depth of Field (DOF) can be confusing but simply put, its the area of focus that is rendered sharply. These 2 images have the same focus point....the foreground flower. The only difference is the f stop used, (remember the hole in the lens) or iris in your eye? For the first image, a large f stop was used-- f4 and only the point of focus is sharp, and the background is soft. The 2nd image had a much smaller fstop –f22, and the entire image is sharp. So not only does the fstop control the amount of exposure it can also be used to control depth of field, and emphasize an element of a photo. Of course when changing f stops you must correspondingly change the shutter speed to create an equivalent exposure.