These images are normally captured using a telescope and specialized CCD along with limited spectrum filters. Typically Ha, SII and OIII filters are used to represent Green, Red and Blue elements of the visible spectrum. Sometimes a Red Continuum is employed. Exposure durations are from 3 to 16 hours. The filters vary in spectrum width from 3 to 5 nanometers.

Narrow band imaging has an important advantage over normal RGB imaging. The impact of light pollution is nearly eliminated. This enables me to image in a suburban setting.