Quote:
Originally Posted by Atmos
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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Yep, that's a good point. Initially I saw "90%+" for Astrodon, and "typically 88%" for the Antlia, which sounded pretty close. Apparently the "90%+" for the Astrodon's is the old spec though, so there's more of a difference than I first thought.
I did the math based off the (very coarse) graphs provided with my Antlia filters and came up with the following:
SII: 93% transmission, FWHM 3.91nm
OIII: 88% transmission, FWHM 3.75nm
Ha: 91% transmission, FWHM 3.59nm
Quote:
Originally Posted by matlud
Antila are working on a new version of the OIII filter with apparently reduced halos. Last I heard it was in testing before retail release.
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I hope they offer trade-ins!