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)||673 nm|
|AR-COATING||dielectrically coated, plane-optically polished|
|FILTER USAGE||CCD, IR-Cut, S-II|
|FILTER MOUNTED||Unmounted / Mounted|
|TYPE OF FILTER||Narrowband|
|SINGLE OR SET?||Single Filter|