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Optolong H-beta 25nm

agenaastro.com/.../optolong-2-h-beta-25nm-narrowband-filter.html
Frozen as ambiguous
TypeHydrogen-beta (Hβ)
SizeOther
Bandwidthn/a
Users 3
Images 13
Most often used with

There doesn't seem to be anything here.

Also available in the following variants:
1.25"
2"
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