Depth of field factors

Since my first shoot, I realized I needed to find out how to adjust the depth of field. So, I turned to Ansel Adams to find out how one can do that. In his The Camera, he indicates on p. 49 that:

  • doubling the f-number e.g. f/8 to f/16 doubles the depth of field;
  • doubling the subject distance quadruples the depth of field; and
  • doubling the focal length divides the depth of field by four

Now, as doubling the focal length doubles the size of a subject on the sensor (p. 45) whilst doubling the distance halves the subject’s size, doubling the subject’s distance and doubling the focal length not only leaves the size of the subject on the sensor unchanged, it also leaves the depth of field unchanged.

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