Reimaging systems for use with the proposed Ritchey-Chretien main telescope

Details Reimaging systems for use with the proposed Ritchey-Chretien main telescope Reimaging systems for use with the proposed Ritchey-Chretien main telescope

Apr 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982lest.rept..240m&link_type=abstract

In Oslo Univ. LEST: Large European Solar Telescope p 240-246 (SEE N82-32209 22-89)

Physics

Optics

Image Enhancement, Magnification, Reflecting Telescopes, Solar Instruments, Aberration, Cassegrain Optics, Field Of View, Focal Plane Devices, Foci, Lens Design, Production Engineering, Skewness

Scientific paper

A convex-concave Cassegrain system, and an apochromatic triplet lens system (S-shaped color curve) are discussed for the large European solar telescope secondary magnification set up. A magnification ratio between 7 and 10 of the F7 primary focal plane is required. The second focus is placed below the coelostat, and the total length between the primary focus and the coelostat entrance is 300 mm. Although the quasi-Cassegrain and triplet lens systems are theoretically feasible, practical implementation is extremely difficult because of alignment problems arising from narrow tolerances. An increase of the focal ratio of the primary focus, to, e.g., F15, and increasing the space between the main telescope and coelostat are suggested.

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