Fig. 5
From: A hyper-resolving polynomial aperture and its application in microscopy
Influence of the number of zones corresponding to the first model of polynomial aperture upon the PSF. The cut-off spatial value in reduced coordinate is varied from 0.7128 for N = 8 up to 0.8603 for N = 1 which has linear distribution. It is shown the same cut-off value at 0.7128 for N = 5 up to N = 8. In addition, another equal value is shown at 0.762 for N = 3 and N = 4, while two different values are obtained for N = 2 at 0.8111 and N = 1 at 0.8603