Optolong SII 6.5nm
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Optolong SII 6.5nm

optolong.com/.../68.html
TypeSulfur-II (SII)
Bandwidth6.5 nm
SizeOther
Users 490
Images 2535
Most often used with
ZWO ASI294MM Pro
Known retailers High Point Scientific
Also available in the following variants:
1.25"
2"
31 mm
36 mm