On some quasi-concentric optical systems for the Large-European Solar Telescope (LEST)

Details On some quasi-concentric optical systems for the Large-European Solar Telescope (LEST) On some quasi-concentric optical systems for the Large-European Solar Telescope (LEST)

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982lest.rept..209m&link_type=abstract

In Oslo Univ. LEST: Large European Solar Telescope p 209-221 (SEE N82-32209 22-89)

Physics

Optics

Lens Design, Reflecting Telescopes, Solar Instruments, Apertures, Cassegrain Optics, Field Of View, Focal Plane Devices, Focusing, Heliostats, Paraboloid Mirrors, Pinhole Cameras

Scientific paper

The large European solar telescope specifications (2.5 m aperture, no image rotation in the final focal plane, minimum of optical surfaces and instrument polarization) are discussed, and the merits of various systems (coaxial, skewed) are compared. A positive skew array of two mirrors (Schiefspiegler system) is ruled out because the highly inclined focal planes mean that the useful field is too small, and considerable focusing is required. Compact Cassegrain or Gregory systems in front of a coelostat system also have field of view limitations. Heliostat systems, using a single long focus primary mirror are advocated.

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