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.
© 1971 Optical Society of America
Original Manuscript: March 15, 1971
Published: October 1, 1971
J. T. McCrickerd, "Coherent Processing and Depth of Focus of Annular Aperture Imagery," Appl. Opt. 10, 2226-2230 (1971)