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I use the generic QHY9 Filters Not sure what kind of issues you are referring to? I use Baader H Alpha 7nm on my QHY9 FW and sure is a tight fit but it works (make sure you have long nails).
The classical LRGB came with the QHY9M and I think they are branded under Orange Bright filters. Haven't heard of Astronomic filters having issues with QHY9 am I missing something?
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