IDAS 6.8nm HS Ha F1.6-F2.2
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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
Type Hydrogen-alpha (Hα)
Bandwidth 6.8 nm
Size Other
Users 6
Images 24
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Also available in the following variants:
2"
50 mm
52 mm