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Personally, I'd go the Baader over the ZWO filters if they're that comparable price wise.
Parfocal filters is a bit of a misnomer as even if the filters are parfocal the rest of the system can be off (refractors aren't perfect, neither are cheaper coma correctors). Baader claims to have parfocal filters BUT there is no baseline to what that is based off; a F/10 system or a F/2 system?
I don't think you need a clear filter, luminance is probably better anyway as it cuts the UV and IR wavelengths.
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