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Luke,
Interesting question....
Using any solar filter (Baader solar film etc.) will reduce the throughput by at least 1/1000....
IMHO you can easily obtain solar spectra without even using the telescope!
Just point the entrance slit of the spectroscope towards the bright daylight sky and you'll easily record the solar spectrum. (I assume you're forced to use an ol' ST8 camera with the SGS....)
This is by far the easiest and safest way of doing it.
I can supply links to detailed solar spectra for comparison.
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