Baader H-alpha Ultra-Narrowband 3.5nm
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Baader H-alpha Ultra-Narrowband 3.5nm

web.archive.org/.../baader-ultra-narrowband-h-alpha-35nm-filter.html
Type Hydrogen-alpha (Hα)
Bandwidth 3.5 nm
Size Other
Users 61
Images 314
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Also available in the following variants:
1.25"
2"
31 mm
36 mm
50 mm
50x50 mm
65x65 mm