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IDAS 6.8nm HS Ha F1.6-F2.2

firstlightoptics.com/.../idas-68nm-uhs-ha-filter-f1-6-to-f2-2-2-5mm-thick.html
Frozen as ambiguous
TypeHydrogen-alpha (Hα)
SizeOther
Bandwidth6.8 nm
Users 10
Images 44
Most often used with

There doesn't seem to be anything here.

Also available in the following variants:
2"
50 mm
52 mm