The diffraction patterns of the central aperture and the first 10 rings of the classical Fresnel zone plate are calculated in the principal focal plane for off-axis distances as large as the radius of the 10th ring. The zone-plate pattern is found by summation; near the axis it is compared with closed-form approximations. The integrated flux within circles as large as the 10th ring is also calculated.
MURK BOTTEMA, "Fresnel Zone-Plate Diffraction Patterns," J. Opt. Soc. Am. 59, 1632-1638 (1969)