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Peter,
There is a growing and enthusiastic group of amateur spectroscopists around the world, who I'm sure would love to be able to assist in any way possible.
Getting good (SNR>100) spectra of faint targets unfortunately means two things to the amateur: Large optics and low resolution spectra....
If we can define what would be an acceptable resolution, we can work backwards to determine the choice of spectroscope and associated telescope.
Unfortunately commercial spectroscopes are very expensive and at the moment there are only three suppliers: Shelyak (LhiresIII, LISA and eShel), Baader (DADOS) and Elliott (CCDspec). SBIG used to supply the DSS7 and SGS, but these have now been withdrawn. The other viable option is to build your own....
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