One more time… this time with three filters: Hydrogen-alpha, Oxygen-III and Sulfur-II. The mapping to color channels is using the fairly conventional “Hubble palette”, that is, Sulfur-II mapped to red, Hydrogen-alpha to green and Oxygen-III to blue (ie in spectral order). In this case, however, I also used the H-alpha as a luminance channel.

The H-alpha data is of much better quality, so I end up with a much crisper image this way, but may be losing some parts of the nebula, particularly in the fainter parts.

The [SII] data was captured using 2×2 binning in order to see anything; absent that there’s really very little there.

Details: