Depth of Field is the part of a photo that will appear sharp and is in focus. Images can vary in depth in field, some having blurred backgrounds, some having both the foreground and background in focus. There are 3 main things that affect and manipulate depth of field: aperture, lens and subject distance, and focal length of the lens. Aperture controls how big or small the hole is of the camera. A smaller f-number will be a wider aperture, giving shallow depth of field. A larger f-number will have a smaller aperture having a deeper depth of field, having more background in focus. Another factor is the distance between the lens and subject, closer will bring more of a shallow depth of field, more farther will bring a more deeper depth of field. Lastly, focal length of the lens, zooming in with the lens will give shallow depth, while lower zoom will give a deeper depth of field.