title: Coherent processing and depth of focus of annular aperture imagery.
abstract: Images from high aspect ratio annulus apertures are spatially filtered in a coherent optical processor for equalization of the modulation transfer function. The imagery is relatively insensitive to spherical aberration, field curvature, and longitudinal color; and the depth of focus is substantially greater than that of conventional imagery with comparable resolution.
authors.forename: J T
authors.initials: JT
authors.lastname: McCrickerd