The Definitive Guide to Aperture and Depth of Field

One of the fundamental concepts of photography is that of aperture. Along with the shutter speed and ISO, aperture is part of the exposure triangle that controls the overall exposure of an image. In addition to this, aperture also affects the depth of field in an image. In short, the aperture (which is measured in f-stops) controls two factors:

  1. The amount of light that is able to reach the image sensor, which in turn controls the image’s overall exposure.
  2. The depth of field (DOF) of the image. The depth of field is simply how much of your image is in focus. Don't worry, there will be more of this later on :)

By completing this article, you'll understand what aperture is, how it affects an image's depth of field and how to select the correct f-stop settings to achieve the optimal depth of field for any given scenario. 

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