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With the C11/Hyperstar combo I have standard baader NB filters. The filter is countersunk in the spacer so it doesn't modify the FL/camera spacing. I heard about standard NB filters not working because of the steep light cone and the angle of incidence but TBH I didn't have issues imaging with them. It could become a problem maybe if you try to separate very close emission lines such as Sii,Nii,Ha but overall it seems good enough.
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