This premium grade ultra narrowband 4.5nm Baader Oxygen III (O-III) filter is for use with fast optical systems with focal ratios between f/3 to f/8. The filter also has non-ageing sealed coated edges for long life.
|FILTER THICKNESS (WITHOUT CELL)||2 mm / 3 mm|
|CWL (CENTRAL WAVELENGTH)||502 nm|
|AR-COATING||dielectrically coated, plane-optically polished|
|FILTER USAGE||CCD, O-III|
|TYPE OF FILTER||Narrowband|
|SINGLE OR SET?||Single Filter|