**90Prime** is a prime focus wide-field imager for the Steward Observatory 90" telescope. The optical design includes a four element corrector and six position filter wheel. The focal plane array is a mosaic of four 4k x 4k CCDs which have been processed for back illumination by the [[http://www.itl.arizona.edu|University of Arizona Imaging Technology Laboratory]]. The camera provides an imaging area of 1.0 square degree on the four CCDs. The edge-to-edge field-of-view including the inter-CCD spacing is 1.16° x 1.16° with a plate scale of 30.2"/mm or 0.45"/pixel.

Operational Links

  * [[:recent_changes_and_known_issues]]
  * [[:user_certification]]
  * [[:telescope_operation]]
  * [[..:90-inch_lightning_shutdown_procedure]]
  * [[:detector_information]]
  * [[:optics]]
  * [[:filter_information]]
  * [[90Prime Operation]]
  * [[90Prime vs 90PrimeOne]]
  * [[:software]]
  * [[:startup]]
  * [[:dithered_exposures]]
  * [[:pointing_wcs_flexture]]
  * [[:focus]]
  * [[:making_flat_fields]]
  * [[:observing_scripts]]
  * [[:helpful_hints]]

Other Relevent Links

  * [[http://james.as.arizona.edu/~psmith/90inch/90inch.html|Bok telescope web site]]
  * [[http://www.as.arizona.edu/|Steward Observatory web site]]
  * [[http://james.as.arizona.edu/~psmith/schedules/schedules.html|Steward telescope schedules]]
  * [[http://cadcwww.dao.nrc.ca/standards|Photometric Fields (click on Stetson in upper left)]]
  * [[http://www.bonn-shutter.de/|University of Bonn Shutter 200mm x200mm]]
  * [[http://astro-cam.com|CCD Controller (ARC Gen 3)]]
  * [[http://www.itl.arizona.edu|UA Imaging Technology Laboratory (ITL)]]

The link below provides direct access to most 90Prime documents:
[[90prime_files]]