Crescent nebula

Frames : 7 x Ha x 12 min, 1 (duplicated 4 times) x OIII x 15 min
Used formula iif(OIII > 0.5, 1-(1-HA)*(1-(OIII -0.5)), HA*(OIII +0.5)) to make synthetic green (from http://lightvortexastronomy.blogspot.com/2013/03/tutorial-nebulae-pixinsight-guide-for.html)
Palette mix : R = Ha, G = synthetic Green, B = OIII)