Sloan digital sky survey 2.5-m telescope: light baffles

Walter A. Siegmund; Siriluk Limmongkol; Charles L. Hull; Daniel Milsom III

doi:10.1117/12.319275

25 August 1998 Sloan digital sky survey 2.5-m telescope: light baffles

Walter A. Siegmund, Siriluk Limmongkol, Charles L. Hull, Daniel Milsom III

Proceedings Volume 3352, Advanced Technology Optical/IR Telescopes VI; (1998) https://doi.org/10.1117/12.319275
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

The Sloan Digital Sky Survey 2.5-m telescope is unique with a 3 degree(s) field of view at f/5. The two-mirror optical design includes two transmitting correcting elements. To avoid excessive central obstruction of the entrance pupil, a conical baffle is necessary in addition to the usual primary and secondary baffles. This conical baffle is suspended approximately midway between the primary and secondary mirrors. In addition, an exterior close-fitting wind and light baffle, not found on most modern telescopes, blocks rays at large angles from the field of view. The baffle design was analyzed using stray light analysis software. Scattered light as a function of source angle was calculated and the dominant scattering surfaces were identified. For sources near the field of view, the uniformity of scattered light over the focal surface was determined.

Citation Download Citation

Walter A. Siegmund, Siriluk Limmongkol, Charles L. Hull, and Daniel Milsom III "Sloan digital sky survey 2.5-m telescope: light baffles", Proc. SPIE 3352, Advanced Technology Optical/IR Telescopes VI, (25 August 1998); https://doi.org/10.1117/12.319275

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