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If the camera format is 35mm, the focal length of the lens is 35mm, the aperture is f/4, the subject distance is 25ft, and the hyperfocal distance is 39'7", then what would be the range of focus when we set the focus to infinity?

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With the camera focus set to infinity (as far as the eye can see) the hyperlocal distance is the near subject distance that will render an object with acceptable focus. The far distance is infinity.

With the camera set to f/4 focused at infinity with a 35mm lens mounted -- the span of acceptable focus is 39 feet 7 inches thru to infinity.

  • ... assuming a display size of 8x10" viewed at a distance of 10" by a person with 20/20 vision. Change any of those parameters and the hyperfocal distance changes as well. – Michael C Sep 7 '17 at 2:48
  • @ Michael Clark -- Assuming the hyperfocal distance given is correct for a specific application --- then if a camera is focused on infinity, that hperfocal distance will the near point in acceptable focus for that same application. – Alan Marcus Sep 7 '17 at 3:38
  • My comment above was specifically referring to the specific distance given in the last sentence of the answer: "With the camera set to f/4 focused at infinity with a 35mm lens mounted -- the span of acceptable focus is 39 feet 7 inches thru to infinity... assuming a display size of 8x10" viewed at a distance of 10" by a person with 20/20 vision." – Michael C Sep 7 '17 at 4:26

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