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Depth of field is a very useful and important part of photography. If you don't know what it is, after reading this you will realize that it is used everywhere from magazine photos to hollywod films.
Depth of field refers to the amount of area of the photo that is in the field of focus. Having a large depth of field would mean that there is a large amount of the picture in focus. Likewise, a small depth of field would mean that a small area of the picture is in focus where the rest is out of focus.
Shallow depth of field is what a small depth of field is referred to as. This is seen in pictures such as when a subject is in the foreground and the entire background is blurry and out of focus.
Expansive depth of field is when there is a large depth of field and the entire or most of the photo is in focus. This is the type of focus used for large landscape photos where the massive mountains in the background are as sharply focused as the rocks in the foreground.
Manipulating depth of field can be as easy as messing around with the focus controls of your camera. However, there are other ways also. Changing the aperture level will yield depth of field changes. A small depth of field would need a smaller aperture number. Having a smaller aperture will make a wider lens opening. Likewise, the larger the aperture the more in focus the image will be. Having a larger aperture number will make the lens opening smaller thus letting in less light.
Having a smaller opening will make the image much more sharper and darker as well.
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