The Baader premium-grade 1.25" OIII filter (8.5nm bandwidth) is perfect for smaller sensor 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.