DayStar Quantum SE

daystarfilters.com/.../Quantum.shtml

Type	Hydrogen-alpha (Hα)
Size	Other
Bandwidth	0.04 nm
Users	9
Images	117
Most often used with	Player One Apollo-M MAX

Community notes

DayStar specifies its filter bandwidth in Ångstroms, which are 10x nanometers, fwiw. I'm separating the SE and PE although they are potentially very similar products.