Antlia Ultra Narrowband Filters

Antlia Ultra Narrowband filters are the tightest emission line filters in the Antlia range, with a 2.5nm bandpass for H-alpha, OIII and SII. The narrow window cuts light pollution and moonlight sharply and keeps stars small, which helps from city skies and on faint nebula detail.

They are aimed at experienced imagers with monochrome cameras and long integration plans. Very narrow filters are sensitive to steep light cones, so check them against the focal ratio of your optics.