Optical quality in telescopes

Details Optical quality in telescopes Optical quality in telescopes

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992s%26t....83..253c&link_type=abstract

Sky & Telescope (ISSN 0037-6604), vol. 83, no. 3, March 1992, p. 253-257.

Computer Science

Performance

Diffraction Limited Cameras, Mirrors, Reflecting Telescopes, Image Contrast, Performance Tests, Refracting Telescopes, Wave Interaction

Scientific paper

Four 6-inch f/8 reflectors fabricated with 1-, 1/2-, 1/4-, and 1/10-wavefront primary mirrors were evaluated under a project designed to determine how good telescope optics actually need be to satisfy amateur astronomers. It is found that the performance of a well-made 6-inch reflector approaches that of a 7-inch Starfire refractor. It is also found that, even at moderate power, the point of best focus is much crisper in a telescope with a 1/4-wavefront mirror than in a 1/2-wavefront mirror. The either-side-of-focus star test, under very good seeing, can easily differentiate 1/4-wavefront and 1/10-wavefront mirrors.

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