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One of the other differences between Astrodon/Chroma is transmission. It's not a lot of difference but Antlia quotes 88% which Astrodon and Chroma quote around the 98% mark. I've got 3nm Astrodons and never seen a halo even with some really bright stars in field but you do pay for that.
For the price the Antlia filters are very good which is what had me considering them in the first place.
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