|
Pixel Scales
CGS4 Pixel Sizes
Low resolution gratings
| Grating |
Perpendicular to slit |
Along slit |
| 40 l/mm |
0.61" |
0.61" |
| 150 l/mm |
0.595" |
0.625" |
Notes:
-
The 40 l/mm grating pixel sizes are independent of wavelength setting.
-
The 150 l/mm grating pixel sizes are virtually independent of wavelength
setting.
Echelle Grating
Because of anamorphic magnification, the Echelle spatial pixel scales vary with grating angle. The 0.41" probably changes with grating angle too, but I don't have measurements of that.
| Grating Angle |
Perpendicular to slit |
Along slit |
| 57.1 deg |
0.41" |
0.783" |
| 62.6 deg |
0.41" |
0.850" |
| 64.4 deg |
0.41" |
0.887" |
| 66.0 deg |
0.41" |
0.93" |
|
