The Atik narrow band filters are manufactured with a band pass of 7nm, capturing a nebula's photons while preventing a large portion of the broad band light pollution from entering. The result is a much higher signal to noise revealing faint details in nebulas. The Narrow band filter set comprises of Hydrogen-Alpha (Ha), Sulphur (SII) and Oxygen (OIII).

 

Filter	Peak Transmission	Half Width	Transmission in Band	Transmission out of Band
Hydrogen Alpha	656.3nm	7nm	>80%	Maximum＜0.3% Average 0.1%
Oxygen III	500.7nm	7nm	>80%	Maximum＜0.3% Average 0.1%
Sulphur II	671.6nm	7nm	>80%	Maximum＜0.3% Average 0.1%