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As it happens, I ended up buying the current generation of Atronomiks in 36mm "Unmounted" (Which are actually fitted in to a blackened aluminium mounting ring so the concerns earlier in this thread about mounting 1mm thick filters no longer apply) as an LRGB-HA-Oiii-Sii set, 6nm for all the NB filters. I am yet to see a noticeable halo on any filter via either my 80mm refractor or 10"F4 newt, though I have not had a chance yet to give the Sii a proper run as it was the last filter I bought and I just have not yet hit a target with any meaningful Sii signal.
If I had the handy cash to buy another mono camera to replace my ASI2600MC I would probably buy another set the same.
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