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AstroDon will reply and Don makes wonderful filters
If you submit a question to Don he will reply. Wonderfully connected with his market. Perhaps that is why he has been so responsive in pushing the state of narrowband filters. They are costly but as has always been true, you get what you pay for. I have the Luma that does cut out IR and am happy with it although I am by no means very experienced to date.
I have been toying with trying his red one that is meant to be used to cut out all common narrowband lines so you can make a star mask that works well in fairly strong nebulous regions.
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