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Thanks Merlin.
So,.........if I'm going to play around with CD's for astronomical spectra, the ''reflective'' method would be the way I presume?
I don't know what type of gratings the R.A and Rigel Systems use, but I've found that the direct view spectra with CD's or DVD's seems to be way off to the edge of the grating and not close to the image of the star.
What is the reason for this I wonder?
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