Key points are not available for this paper at this time.
The theoretical and experimental investigation of Fourier images, described in Parts I and II, is extended to the case of finite sources. The Fourier images produced by a pair of point sources, a rectangular source and a Gaussian source are considered in detail. The dependence of focus on source dimensions for the first two of these cases is confirmed experimentally with light optics.
Cowley et al. (Wed,) studied this question.