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Mirko,
Thanks for that. Interesting.
I'm going to try a faster scan, down to 3-4 sec in the hope that it "freezes" the seeing.
I found using a 2" Baader 7nm H alpha as an ERF for the Ha scans showed an improvement.
Unfortunately using the Baader CCD Blue filter, which I use as an ERF on the CaK filter, didn't live up to expectations in the SHG.
So, at this stage, 7nm H alpha and the ND0.9 plus IR block for other wavelengths.
Onwards and Upwards.
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