The Baader 2" Narrowband (6.5nm) OIII Filter is an excellent choice for astrophotographers who wish to capture the most contrast-rich images optimized for CMOS sensors, while also delivering outstanding results on CCD sensors at the Oxygen III wavelength. The filters exhibit excellent light transmission properties in the OIII wavelength range, while completely "cutting off" light at other "undesired" wavelengths. They guarantee excellent results when used with telescopes having a focal ratio of f/10 to f/3.5.
The filters' high-quality glass material and craftsmanship promise excellent contrast and image sharpness. The coatings are applied to the glass using the most modern equipment, ensuring the ideal transmission range. The anti-reflective coatings contribute to superior image formation, and additionally, the surfaces have been treated to make the glass material scratch-resistant.