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Spectroscopic gratings are available through Paton Hawksley (Star Analyser) - Rainbow Optics do a similar grating but don't seem to ship outside the US.
The rigel system is a 600 l/mm set-up which is different as it sits behind an eyepiece....
For "serious" slit spectroscopes there are:
SBIG - they sell the SGS and DSS7 versions
Baader - the Dados and Braches echelle spectrograph
Shelyak - the LhiresIII Littrow, LISA low res, and the eShel echelle model, all these are very good but very expensive.
(These are reviewed in "Astronomical Spectroscopy for Amateurs" p77-p85)
Last edited by Merlin66; 20-03-2011 at 07:40 PM.
Reason: reference to ASA added
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