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What is Depth of Field?
Depth of Field
© Liz Masoner 2007 licensed to About.com, Inc.
Depth of Field is the amount of your image before and beyond your focus point that will be in focus. Depth of field tells you whether or not your subject and background can be sharply focused at the same time.

    Depth of field is determined by several factors:
  • Aperture/F-Stop
  • Lens
  • Subject Distance

While the camera can actually only focus on one tiny point in space, the depth of field determines how much of the image is in "acceptable focus" to the human eye.

In subjects such as landscapes, a large depth of field is often desired so that the entire scene appears to be in focus. With subjects such as portraits, a small depth of field is often used to blur the background and reduce distractions from the main subject of the image.

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