Cocoon Nebula with Ha

I took 4,5 hrs of Ha to boost the nebulosity and some extra RGB to add some color.

Processing was quite difficult because the tonemapped Ha was so strong that the colors were lost in the nebula. I think I added only 30% of Ha to the red channel and combined the L+Ha for luminance. So it's basically LHa(HaR)GB combination...

Total exposure is now 10 hrs:
                                    L        = 10 * 900"
                                    Ha     = 9 * 1800"
                                    RGB  = 12 * 300" (bin2*2)

Full size again on Astrobin