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An easier and simpler method is to buy a Paton-Hawksley transmission grating and blu-tac it into the lens hood; this will show the spectra of the brighter stars pretty well with a 135mm telelens.
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Might work alright....could give that a try too. See which works the best, or even have two setups. Might look into some other ways of obtaining spectra, vise a vie, construction of spectroscopes.