aperture=F16

aperture= F 5.6

The two images above uses a range of  long and shallow depth of field. I will  be explaining how these images use depth of field and when you might want to use them.

Often photographers are after a shallow depth of field. This is shown in the photo above by the "f5.6" photo. The key thing about a shallow depth of field is that, because only a small area of the photo is in focus, it concentrates the viewer's eyes on that part of the photo. It isolates the subject from its surroundings. Because a shallow depth of field isolates the subject from its surroundings, it is really useful in portrait photography. And because a lot of the photos we take are of people, it helps to know how to separate them from the background in this way.

The other photo shows a long depth of field – pretty much everything in the photo is in focus. This is useful too, for those times when you really do want everything in focus. Landscape photographers often want to use this effect because they want to get the whole scene in focus – from the flowers in the foreground to the lighthouse in the background.

In the photos above. The camera lens in the bottom right shows how large or small the aperture was when the photo was taken. When the aperture is wide open – f5.6 – we get a shallow depth of field. And when the aperture is almost closed – f16 – we get a long depth of field.