I took this photo of my nephew with a shallow DOF. While his face is in focus, the grass in the background is blurred. This shallow DOF works well for this photo as all your attention goes to that sweet freckled face!
The second pic of the wedding cake was taken with a deeper DOF. The story would have been better captured had I used a more shallow DOF. The details in the background distract from the beautiful floral detail on the cake.
Project Made In: Fundamentals of Exposure for Beginners