Imaging with Fresnel zone pupil masks: extended depth of field.

@article{Indebetouw1984ImagingWF,
  title={Imaging with Fresnel zone pupil masks: extended depth of field.},
  author={G. Indebetouw and H. Bai},
  journal={Applied optics},
  year={1984},
  volume={23 23},
  pages={
          4299-302
        }
}
Fresnel zone plates are used as pupil apertures to extend the depth of field of an incoherent imaging system. The defocused optical transfer function is evaluated approximately, and the results are confirmed by experiments and by subjective evaluations of the images of a test chart. With a pupil having four zones, for example, the resolution limit at four depths of field out of focus is improved by a factor of 10. 
Focal Depth of an Apodized Focusing Optical System
Focal Depth of an Apodized Focusing Optical System
High focal depth with a quasi-bifocus birefringent lens.
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