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I have used Baaders, Astronomiks, Astrodon. Baaders were not parfocal as advertised nor were they 1:1:1 colour combine ratios. Astronomiks are very thin and a lot of filter wheels won't mount them properly (they are 1mm and most others are 3mm thick).
Astrodon Gen 11 filters are terrific, are parfocal, mount easily, wear well, are 1:1:1 colour combines, no halo issues and make imaging a whole lot easier. Yes they cost more but work the best.
Greg.
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