The ZWO narrowband deep-sky filters are an excellent choice for astrophotographers aiming to capture the highest contrast CCD images at H-alpha, O-III, or S-II wavelengths. These filters exhibit outstanding light transmission properties within the selected wavelength range, while completely "cutting off" light at other "unwanted" wavelengths.
The filters' superior glass material and craftsmanship promise excellent contrast and image sharpness. The coatings are applied 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 2 mm glass material scratch-resistant.
All three filters have a maximum light transmission capability of over 80%. The peak wavelength for the H-Alpha filter is 656 nm, the O-III filter peaks at 500 nm, and the S-II filter falls within the 672 nm range, primarily aiding in the photographic capture of nebulae, supernova remnants, etc., that emit in these radiation ranges.