Palomar Observatory Optical Designs

Prime Focus

Cass Focus (based on H. Petrie information, c. 1994)

Cass Focus specifications (measured by J. Zolkower, 2016)

  • Minimum 16 inch dia. field at f/15.78;
  • Plate scale: 2.56 arcsec/mm;
  • 17.3 arcmin field;
  • Radius of curvature: R132.5”; The sag would be ~ 0.24” at the edge of field.

Cass Focus (created by Leon Harding, 2012, using original drawings from paper 'vault' with help from P. Gardner)

Topic attachments
I Attachment History Action Size Date Who Comment
PDFpdf 200_M1-M2_Measurement.pdf r1 manage 458.9 K 2011-05-12 - 16:58 JeffZolkower  
Unknown file formatzmx Hale_Cassegrain_150708.zmx r1 manage 35.8 K 2015-07-09 - 03:49 RichardDekany  
Unknown file formatzmx LFC_with_Wynne_Corrector.zmx r1 manage 13.1 K 2012-04-27 - 22:17 RichardDekany  
Unknown file formatzmx WaSP_meniscus_dewar_window_Offner_relay_to_guider.zmx r1 manage 26.8 K 2012-04-27 - 22:47 RichardDekany  
Unknown file formatZMX f_16_to_f_9_optical_setup.ZMX r1 manage 23.7 K 2012-06-28 - 00:55 RichardDekany  
Unknown file formatZMX f_16_to_f_9_optical_setup_with_both_focii.ZMX r1 manage 24.1 K 2012-06-28 - 00:55 RichardDekany  
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Topic revision: r7 - 2016-10-07 - RichardDekany
 
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