Critical focus

The portion of the picture that is optically in focus.

In a photograph, the area of critical focus is the portion of the picture that is optically in focus. This does not relate to the depth of field which describes apparent sharpness. Reducing the size of the aperture will increase the depth of field but the plane of critical focus will not change. The depth of field extends away from the plane of critical sharpness.

Critical focus
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Adapted from content published on
  • Image by Ɓukasz Rawa: public domain — from
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