Effects of a despaced secondary of a Wolter type II telescope on image quality

Physics – Optics

Scientific paper

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Cassegrain Optics, Imaging Techniques, Mirrors, Telescopes, Cross Sections, Foci, Grazing Incidence, Occultation

Scientific paper

The focal shift of the Wolter type II telescope, a glancing incidence analog of the normal incidence Cassegrain telescope, due to the despacing of the secondary with respect to the primary, is analyzed. The location of the rms best focus on the optical axis can be derived from a resulting expression. The results are verified by ray tracing of an actual Wolter type II telescope.

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