Quote:
Originally Posted by theodog
Is it possible to use "standard spectra" to calibrate the efficiencies at various W.L. for any camera/scope system?
I suppose it would be something like a flat-field spectra? Using a tungstan light globe? 
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Yes. You take an image of a reference star with a simple curve like a A2 star. (I have used beta Car). You then calibrate the frequency and divide this by a catalogue reference spectra. (these come with Vspec)
The resulting graph is then smoothed out to remove the absorption lines.
The final result is a reasonable approximation of the instrument response of your camera.
You can then divide your unknown spectra by reference graph- similar process to dividing by a flat field.