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)
|dielectrically coated, plane-optically polished
|TYPE OF FILTER
|SINGLE OR SET?