Focus Scientific

Baader Oxygen-III (OIII) Narrowband 8.5nm CCD Filter (2\")

The Baader premium-grade 2" OIII filter (8.5nm bandwidth) is perfect for full-frame CCD cameras. It works well in fast optical systems from f/10 to f/2.8.

These filters block the IR wavelengths. They will not produce halos or reflections.

The glass substrate is finely optically polished plane parallel, providing 1/4 wavefront over entire surface.

Multi-layer dielectric coatings are plasma-assisted and ion beam-hardened using the latest technology

The Baader Planetarium Narrowband 8.5nm OIII Filter coatings will never degrade from normal use or normal cleaning.


  • 8.5nm FWHM bandpass
  • Passes 501 nm
  • 48mm filter threaded
  • Dielectrically coated
  • 1/4 wavefront surface accuracy
  • Made in Germany