The Baader 2" Narrowband (6.5nm) Filter Set is an excellent choice for astrophotographers who aim to capture the highest contrast images optimized for CMOS but also perform excellently on CCD at H-alpha, H-beta, Oxygen III, or S-II wavelengths. These filters offer outstanding light transmission properties in the selected 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 - f/3.5.
The filters' superior glass material and craftsmanship promise excellent contrast and image sharpness. The coatings are applied to the glass using the most advanced 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.