Flat Detector, at the ViewPlane at 150 mm (pinhole 3.86 mm dia, a = 60 mm): (Top Left) Mesh-plot of Point Spread Functions (PSF) of 5 points, (Top Right) Image of the five points superposed, (Bottom Left) Sensitivity Fall-off Factor measured (sum of each of the PSF) versus expected, (Bottom Right) Measured versus expected Full-Width-Half-Max in mm.