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Nice work Stephen. There is a lot of filter work on this forum, from you, from Marc and from Bert. Its great. You guys are pushing the boundaries.
Richard Crisp did some work a few years back with polarising filters.
You take several with different angles of the filter like 45, 90, 180 and assign them to different colour channels.
It works on some objects, like the Crab Nebula. It may work on Eta C. I have one of these filters but ideally you'd need 3 set to different angles of turn otherwise I'd have to manually spin the filter each time I wanted a different channel.
Greg.
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