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Originally Posted by Merlin66
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Thanks Merlin.
Definitely cheap enough, but would it be of sufficient optical quality towards a usable star spectroscope?
It's ''non worked glass'' so I don't know how that will affect resolution?
Would it be similar to a 1200l/mm DVD grating?
The DVD grating in a test set up recently showed many clearly defined Fraunhofer lines on solar light and surprised me a bit as I didn't expect much from it at all.