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)
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Topic revision: r7 - 2016-10-07 - RichardDekany