I bought a C2 filter through AliExpress. It's the S2/O3 version and the cheaper option. My plan was to also use my Optaling L-Enhance with similar bandwidth so as to get more O3 in my images and a bit less Green.
I have had limited opportunity to really test this filter but what I have done has been quite satisfactory. I have yet to try a SHO or similar processing - mainly because limited clear sky time for the past 6 months but I remain hopeful. The Qld Astrofest is coming up in May/June and I hope the remedy this then.
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