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Optolong Sulfur II 12nm

agenaastro.com/.../optolong-2-s-ii-12nm-narrowband-ccd-nebula-filter.html
TypeSulfur-II (SII)
SizeOther
Bandwidth12 nm
Users 6
Images 11
Most often used with

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Also available in the following variants:
1.25"
2"
EOS Full