Baader S-II Ultra-Narrowband 4nm (CMOS-Optimized)
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Baader S-II Ultra-Narrowband 4nm (CMOS-Optimized)

baader-planetarium.com/.../baader-s-ii-ultra-narrowband-filters-(4nm)-%E2%80%93-cmos-optimized.html
TypeSulfur-II (SII)
Bandwidth4 nm
SizeOther
Users 114
Images 712
Most often used with
ZWO ASI294MM Pro
Known retailers Agena Astro  ·  High Point Scientific
Also available in the following variants:
1.25"
2"
31 mm
36 mm
50.4 mm
50 mm
50x50 mm
65x65 mm