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Thanks Merlin and Bert. I started doing the sums for all this and it's going to be expensive if I get the filters and a filter wheel for the Tak Sky 90 and its adaptors. I guess I'm wondering whether the narrowband filters will cut through my polluted skies a lot more than the Hutech LPS-V3 filter I have at the moment. Thanks also Bert for confirming I need something like RegiStar to get process the different images to get the same size as I can't just align and stack them in a program like Nebulousity. More pondering required I guess.
Craig
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