10 December 1992 Design and construction of an astrometric astrograph
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Abstract
The Optical Sciences Center, University of Arizona, has designed and constructed a unique 'red corrected' astrometric astrograph objective lens for the United States Naval Observatory. A five element design, with an integral Schott OG550 filter, was developed to meet the requirement for a 2060 mm focal length, f/10 system. The lens provides a nearly zero distortion flat field of 5 by 5 degrees in the sky. A weight limit of 55 kg led to the use of a titanium lens barrel. Assembly tolerances are satisfied through the use of elastomeric subcell mounting of the individual elements, and an adjustable final element. The lens is hermetically sealed and uses a filter/dessicator system to insure the long term cleanliness of the optics.
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Daniel Vukobratovich, Daniel Vukobratovich, Tina M. Valente, Tina M. Valente, Robert R. Shannon, Robert R. Shannon, Roger A. Hooker, Roger A. Hooker, Richard E. Sumner, Richard E. Sumner, } "Design and construction of an astrometric astrograph", Proc. SPIE 1752, Current Developments in Optical Design and Optical Engineering II, (10 December 1992); doi: 10.1117/12.130737; https://doi.org/10.1117/12.130737
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