This filter is worth a try! It supports customized multi-element spectral lines including hydrogen, helium , oxygen , nitrogen, sulfur, iron , silicon, argon, calcium, sodium, etc., and can accurately separate the spectra of specific wavebands. Whether you are capturing the diffuse details of a diffuse nebula or analyzing the layered structure of a planetary nebula, choosing the right spectral line filter and trying customization may help you obtain highly recognizable images.