Exact optics - III. Schwarzschild's spectrograph camera revised

Details Exact optics - III. Schwarzschild's spectrograph camera revised Exact optics - III. Schwarzschild's spectrograph camera revised

Mar 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mnras.348.1009w&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 348, Issue 3, pp. 1009-1018.

Astronomy and Astrophysics

Astronomy

3

Instrumentation: Spectrographs, Techniques: Spectroscopic, Telescopes

Scientific paper

Karl Schwarzschild identified a system of two mirrors, each defined by conic sections, free of third-order spherical aberration, coma and astigmatism, and with a flat focal surface. He considered it impractical, because the field was too restricted. This system was rediscovered as a quadratic approximation to one of Lynden-Bell's `exact optics' designs which have wider fields. Thus the `exact optics' version has a moderate but useful field, with excellent definition, suitable for a spectrograph camera. The mirrors are strongly aspheric in both the Schwarzschild design and the exact optics version.

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