I captured the data for this image two years ago from home and have had a few goes at processing it. This is my best result so far though I'm still not over the moon about it. It's not a particularly crisp object and the distribution of Ha, Oiii and Sii seems to result in murky colours in typical narrowband palettes. I ended up basing the colour on a bi-colour Ha/Oiii combo with some subtle green additions from Sii.
NGC3199 is an unusual emission nebula created by the Wolf-Rayet star HD89358, described in one paper as an "interstellar snow plough" that has created a distorted bubble by moving through a uniform interstellar medium.
Data captured at St Lucia, 25 April to 15 May, 2014
Scope: Ceravolo C300 @ f/9 = 2760mm FL, Atlas focuser
Mount: AP900
Camera: U16M
Filters: Astrodon E series Gen 2 LRGB, 3nm HA, OIII, SII
Guiding: Lodestar / MMOAG
Image scale: 0.67 arcsec/pixel
Exposures: 19x1200s Ha, 14x1200s OIII, 16x1200s SII (16.3 hours)
Processing: PixInsight 1.8
Full res version:
http://www.astrobin.com/full/251834/B/
Happy to receive constructive criticism as always...
Cheers,
Rick.