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28 July 2010 Optical design of the CCD/Transit Instrument with Innovative Instrumentation (CTI-II) Telescope
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Abstract
We describe a 1p8m f/6 Cassegrain optical system that creates a 1.42° FOV with near diffraction limited images from 400nm to 1100nm with full-field distortion less than 0.01%. The astronomical application for this optical system is the CCD/Transit Instrument with Innovative Instrumentation (CTI-II), designed to produce a highly precise photometric and astrometric survey of a complete strip of sky in the northern hemisphere. We describe the scientific observation program and supporting optical design for the telescope. The all-spherical, five lens field corrector represents a very capable optical system that works well with many other astronomical telescopes such as SDSS, Pan-STARRS, SkyMapper, ESO's VST, the WIYN ODI, and the MMT WFC. In many cases, using a five lens corrector exceeded the optical performance of the original published system designs. Conversely, these and other optical concepts compromised the performance of the CTI-II design. The CTI-II design is similar to many other wide-field telescope and imaging camera designs, thus the design is of potential general use in astronomy.
© (2010) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Mark R. Ackermann, John T. McGraw, Malcolm J. MacFarlane, Tom Williams, Peter Zimmer, Walter Gerstle, and Francisco Roybal "Optical design of the CCD/Transit Instrument with Innovative Instrumentation (CTI-II) Telescope", Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 773311 (28 July 2010); https://doi.org/10.1117/12.856066
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