ZWO SHO narrowband (7 nm) deep-sky filters are an excellent choice for astrophotographers looking to capture the highest-contrast CCD images at the H-alpha, O III, or S II wavelengths. The filters offer outstanding transmission within the selected wavelength range while completely blocking light at other unwanted wavelengths.
The filters' high-quality glass and precision workmanship deliver excellent contrast and image sharpness. The coatings are applied to the glass using state-of-the-art equipment, ensuring an ideal transmission range. Anti-reflective coatings contribute to superior image quality, while the surfaces are also treated to make the 2 mm glass scratch-resistant.
All three filters provide maximum transmission of over 80%, with peak transmission at 656 nm for the H-alpha filter, 500 nm for the O III filter, and 672 nm for the S II filter. They are primarily designed for astrophotography of nebulae, supernova remnants, and other objects emitting in these spectral ranges.
