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Proceedings Paper

Preliminary Optical Designs For An MMT Upgrade: A 256-Inch Filled-Aperture Optical/Infrared Telescope
Author(s): Harland W. Epps
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Paper Abstract

A preliminary optical design is proposed to convert the existing Multiple Mirror Telescope (MT) on Mount Hopkins to the maximum diameter, filled-aperture optical/infrared telescope that can be accommodated by the existing telescope mounting and building without substantial modification. The design utilizes a 256-inch diameter f/1.00 primary mirror which is chosen to be parabolic in order to provide adequate field of view at the required f/45.0 infrared Cassegrain focus. A 40-arcmin-diameter flat field of view is provided at an f/4.5 optical Cassegrain focus such that the resulting image scale gives a sampling factor of 3.5 (27 μ) pixels per (2/3 arcsec) spatial information element. The three-element refracting field corrector contains material for an atmospheric dispersion compensator (ADC) and it is fully color-corrected such that the entire passband from 0.33 μ to 1.60 μ can be imaged simultaneously. An f/9.0 Cassegrain focal expander-corrector with (ADC) is provided which uses the f/4.5 secondary mirror and enables the new telescope optics to be coupled to existing ancillary MMT instrumentation without substantial modification to the latter. A two-element all-spherical null-lens design is presented which provides a diffraction limited optical null-test arrangement for the unprecedentedly large f/1.00 parabolic primary mirror.

Paper Details

Date Published: 10 June 1987
PDF: 18 pages
Proc. SPIE 0766, Recent Trends in Optical Systems Design and Computer Lens Design Workshop, (10 June 1987); doi: 10.1117/12.940215
Show Author Affiliations
Harland W. Epps, University of California, Los Angeles (United States)


Published in SPIE Proceedings Vol. 0766:
Recent Trends in Optical Systems Design and Computer Lens Design Workshop
Robert E. Fischer; Carmina Londono, Editor(s)

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