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IDAS 6.8nm HS Ha F2-F3.5

firstlightoptics.com/.../idas-68nm-hs-ha-filter-f2-to-f3-5-2-5mm-thick.html
TypeHydrogen-alpha (Hα)
SizeOther
Bandwidth6.8 nm
Users 0
Images 0
Most often used with

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Also available in the following variants:
50 mm
52 mm