Depth of field is the zone within a photo that appears sharp and focus. The sharp zone will vary from photo to photo depending on its different factors, like aperture and the distance of the subject. By adjusting your camera settings and composition, you can determine the amount of the image whether it turns out sharp or it ends up blurry. Images that are sharp from the back are said to be deep/good depth of field, which is popular in landscape photography. Other images have small zone focus, which is known as shallow depth of field.

Whether the image is a shallow depth of field or a deep depth of field it can make a huge difference. Factors that affect depth of field are the aperture (f-stop), distance between lens and subject, and the focal length of the lens. Smaller f-numbers correspond to the widest aperture and the shallowest depth of field. The largest f-numbers correspond to the narrowest apertures and is the deepest/good depth of field. Closer the subject to the camera, the shallower your depth of field becomes. Longer the focal length, shallower the depth of field.