4.0-m R-C Spectrograph Quick Reference
| Plate Scale (at f/7.8 focal plane) | 6.56 arcsec/mm |
| Slit Length | 50 mm 328 arcsec |
| Collimator Focal Length | 1161 mm |
| Point source collimated beam diameter | 152 mm |
| Collimator-to-Camera Angle | 46° |
| Grating size | 203×254 mm |
| Camera Focal Length | 229 mm |
| Demagnification | 5.070 |
| Plate Scale (at detector) | 33.3 arcsec/mm |
- At f/7.8 focus, 1 arcsecond = 152 micron
- With the Loral 3K CCD:
- The spatial scale on the detector is 0.50 arcsec / 15 micron pixel.
- For anamorphic demagnification of 1.0, the 2-pixel projected slit is 1.0 arcsec or 152 micron wide.
- The full slit length illuminates ~657 rows.
Michael Keane (mkeaneATnoao.edu)
Jack Baldwin (jbaldwinATnoao.edu)
Updated on May 10, 2021, 10:17 am