• This optical region spectrograph has AR coated refractive optics, with a beam size at its camera of 125 mm, giving …
• slit length: 30 arcsec
• wavelength range: 360 - 950 nm
• spectral coverage: 100 nm at 0.1 nm resolution
• spectral resolutions: 0.1, 0.2, and 0.4 nm with 1 arcsec wide slit
• detector: back illuminated, low noise CCD STA0520A, with very nice cosmetics.

STA0520A CCD
2688×512 pixels, 15 microns
ITL Serial Number 8228
Detector operating temperature -110C
Gain = 1.3 e/DN with setting 10
Gain = 2.6 e/DN with setting 5
For both gains the full well is ADC limited (65k DN), so this is 85,000 or 170,000 electrons.
Noise is 3.4 electrons (3.2 in overscan region)

• efficiency: determined by Mark Wagner for telescope plus spectrograph
• further details are under the General Instructions for use of the VATT Spectrograph.
• bandpass filters available: S8612 (red blocking); GG-400, GG-475, OG-550 (cut-offs to the blue in nm).

• General Instructions
• Instructions on Guiding

• Argon Calibration Lamp was replaced on 4/26/2013.
• Note: There is some concern the lamps are burning out faster than they should.