Depth of Field
Depth of field is the distance between the closest and farthest objects in a photo that appears acceptably sharp. Now your camera can only focus sharply at one point. … In a photograph with a narrow DoF, only a small slice of the image is in focus. Conversely, with a large DoF, much more of the scene is sharp. It’s is the zone within a photo that appears sharp and in focus. In every picture, there is a point of focus (where you actually focus your lens). But there is also an area both in front of, and behind, your point of focus that also appears sharp – and that area corresponds to the depth of field.