Baader S-II 8nm 36mm filter

Together with Baader H-alpha 7nm filter and O-III 8.5nm filters, the Baader S-II 8nm filter enables color imaging using trichromy technique. This filter is also perfect for use with achromatic refractors that, due to chromatic aberration, are not usually recommended for the long-exposure astrophotography. But using this filter the deep-sky astrophotography becomes not only possible but also offers excellent results since the narrow bandwidth virtually delete the effect of chromatic aberration.