90prime: A prime focus imager for the steward observatory 90-inch telescope

G. Grant Williams, Edward W. Olszewski, Michael P. Lesser, James H. Burge

Research output: Contribution to journalConference articlepeer-review

62 Scopus citations


Steward Observatory is currently commissioning a prime focus wide-field imager for the 90-inch telescope located at Kitt Peak. The camera's focal plane array is populated with a mosaic of four thinned Lockheed 4096 × 4096 pixel CCDs. The f/2.98 system provides a plate scale of 0.45″/pixel and a total field-of-view of 1.16° × 1.16°. The optical design includes a four element corrector and six position filter wheel. The first science run was conducted in November 2003. We will describe the design of the "90prime" instrument and results from the commissioning runs.

Original languageEnglish (US)
Pages (from-to)787-798
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
Issue numberPART 2
StatePublished - 2004
EventGround-based Instrumentation for Astronomy - Glasgow, United Kingdom
Duration: Jun 21 2004Jun 25 2004


  • 90-inch
  • 90prime
  • Bok
  • Prime focus
  • Steward observatory

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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