Oxygen III line band filters

Oxygen III filters generally have better than twice the contrast of a narrowband filter (four times the contrast or more compared with a broadband filter). They are good for observing very faint planetary and gaseous nebulas (such as M76 and Barnard’s Loop in Orion) that are normally invisible without a filter, even from relatively dark sky sites. They also give excellent results on brighter nebulas like M17 and M27 from light-polluted suburban locations. They are often your only hope for seeing faint nebulas from heavily light-polluted locations.

Oxygen III filters work best with medium to large aperture telescopes (6” to 8” and larger). They are for visual use only and cannot be used for photography.