My first attempt at processing narrowband image data that does not use the Hubble Palette to interpret colours. Two images (bicolor) were used - Ha for the Red channel, OIII for the Green channel and the same OIII is used again for the Blue channel. I have calibrated (Lights, Bias, Darks and Flats) my raw data, then aligned and stacked them into Ha and OIII masters used in the HOO combination using PixInsight. I have done nothing else to the image - no background leveling, no noise reduction, no curves, no saturation, no HDR, nothing. The final image just has a contrast stretch (Histogram Transformation) applied to bring out the details.

Here are the subframe details:

Ha - 32 x 30 minute subs (no binning)
OIII - 38 x 30 minute subs (no binning)

So the total exposure was 35 hours! The data was captured with a 16-inch f/8.9 RCOS on a Paramount ME, SBIG STL11000M CCD with Astrodon LRGB filters, field flattener located at the Sierra Remote Observatories outside of Fresno, California at 4600 feet elevation.

Image is cropped and resized from the original 4008 x 2745 to my desktop wallpaper size.