The position and dimensions of the circle of least confusion
(CLC) on axis for a lensless Schmidt camera telescope operating at
0.82 are calculated. The camera is to be
used in the fluorescence detector of the Pierre Auger
Observatory. Our analysis was developed for an aspherical mirror
for any on-axis position of the point light source. Our technique
uses the intersection of the marginal ray from one side of the aperture
with the caustic produced by the intermediate rays from the opposite
side of the aperture to locate the CLC.
© 1998 Optical Society of America
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