Spectroscopy is done with the Large Field Objective (pixel scale ~ 0.29 arc / second), one of three slits and one of three grisms.
Long Slits
Slits (arcsec) 2 x 290
1 x 290
0.6 x 290
Table 1. SOFI slits. Grisms
Grism \ Parameters Order
Dispersion
Resolution (0.6" slit)
Wavelength Range
GB Grism Blue
1
6.96
1000
0.95-1.64
GR Grism Red
1
10.22
1000
1.53-2.52
HR Grism
3
4.63
2200
2.00-2.30
HR Grism
4
3.44
1500
1.49-1.81
HR Grism
5
2.71
1400
1.20-1.28
HR Grism
6
2.32
1400
1.17-1.24
HR Grism
7
1.87
1400
0.89-0.93
HR Grism
8
1.58
1400
0.86-0.95
Table 2. SOFI Spectroscopy modes. Line Identification
Reccomended DIT/NDIT for Arcs and Flats
Arcs: DIT=5 sec, NDIT=10 (for both LR and MR)
Flats: DIT=2 sec, NDIT=30 (for both LR and MR)
Distortion maps for spectroscopy
Calibration data for distortion corrections, for all spectrosocpic modes (link to the new ftp site; last set of distortion calibrations from 2011-05-16).
