How to control Depth-of-field?

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Depth of field refers to the range of distance that appears acceptably sharp. A wider depth-of-field means that nearly everything in the scene is always in focus. Whereas a narrow depth-of-field means that only the main subject in focus is sharp and rest all the things are blurred or out of focus.

The three main elements that help you control the depth of field are

  • Aperture size
  • Focal length
  • Focus point
Aperture and depth of field are inversely proportional. i.e a small aperture (such as f/22) will produce a greater depth of field. And a wide aperture (such as f/2.8) will produce narrow depth of field. Similarly a wide angle lens will produce a greater depth of field. So if you use  a small aperture in combination with a wide lens you increase depth of field. And, a wide aperture with a long lens (narrow lens) will restrict sharpness to a tiny area in focus.

Focusing on a closer subject will give a narrow or less depth of field than when you focus on a subject at a distance. To achieve desired depth of field you can combine aperture and focal length to widen or reduce overall depth of field.

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