Physics – Optics
Scientific paper
Sep 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.216..411w&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 216, Sept. 15, 1985, p. 411-427.
Physics
Optics
7
Mirrors, Reflecting Telescopes, Schmidt Telescopes, Alignment, Optical Fibers, Optics, Optimization, Polishing
Scientific paper
A three-mirror telescope is described which covers a field 3 degrees in diameter with images smaller than 0.5 arcsec in extreme spread. Over the central 2 degrees of the field the images are smaller than 0.1 arcsec. The field is flat, which may be a significant advantage in some applications. Compared with the three-mirror telescope previously described (Willstrop, 1984), the images are worse (though still very much smaller than the seeing usually experienced in a ground-based telescope), the tube length is nearly 25 percent longer, and the secondary mirror is more aspheric and therefore more difficult to figure. Methods of polishing and testing the mirrors and checking the optical alignment are described. With optical fibers, the large field of seeing-limited definition could be used to great advantage, possibly by independent observers simultaneously.
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