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Those are some very good results. the spectrum illustrates the bandpass/cut-off nature beautifully.
I did use one of these for some DSO imaging from my backyard and the red skyglow was almost nil with the filter. only issue was colour balance. it shifts it quite a bit, but I believe if you use a grey source as the white balance point, colours get corrected??
what you could add on would be a 5 min exposure of the night sky with and without the filter, should show a large difference.
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