I like Astrodons as well. I have used Baader and they are good and a bit redder than Astrodons. Astrodons seem to be parfocal and 1:1:1 colour combine. Baaders that I had (about 5 years ago now) were not 1:1:1 colour combine.
I did not notice halos from either except on the brightest of stars where I think its unreal to expect zero halos from any maker.
Greg.
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