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I used both Baader, Astronomiks and Astrodon (Gen 1 and Gen 2).
I prefer the Astrodons as they are easier to get balanced colour and quite parfocal (within reason).
Baaders are quite good and have very good red response, are less parfocal despite the claim and I had a 7nm Ha filter which was defective. I have some Astronomiks and they have good colour balance, are cheaper, thinner (they need spacers to fit in filter wheels) and I found they gave good star colours.
So any of those 3, I think are good. Astronomiks are the cheapest I think. Mike S uses Astronomiks.
You can get great results from any of them. Astronomiks are the cheapest.
Greg.
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