This premium grade ultra narrowband 4.5nm Baader Sulphur II (S-II) filter is for use with fast optical systems with focal ratios between f/3 to f/8. The filter is IR blocked and also has anti-reflection coatings and will give images free of halos and ghosting. The filter also has non-ageging sealed coated edges for long life.
|FILTER THICKNESS (WITHOUT CELL)
||2 mm / 3 mm
|CWL (CENTRAL WAVELENGTH)
||dielectrically coated, plane-optically polished
||CCD, IR-Cut, S-II
||Unmounted / Mounted
|TYPE OF FILTER
|SINGLE OR SET?