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I have 80A blue. Fun to try on the gas giants, but prefer to view without it. Helped with Martian polar cap too. Combined with ND filter it makes an excellent moon filter (much better than the actual green "Moon" filter).
I had a dark red filter which was recommended for Mars, but I could not see anything with it, so I returned it. I think you need lots more aperture for it to be any use.
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