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I think this little picture gives this discussion a bit of perspective!
I have 2 filters coming via Gerd Neumann at Astronomiks - the GG420 and the GG435. He is happy for me to keep whichever performs the best in my setup. He also tells me that Astronomiks is developing a set of RGB filters to exactly address this blue issue in refractors. I will resurect the thread once I have a result!
Thanks everyone for the input!
Peter
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