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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:

  1. The 40 l/mm grating pixel sizes are independent of wavelength setting.
  2. 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"
Contact: Tom Kerr. Updated: Tue Jan 25 11:08:59 HST 2005

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