M17 The Omega Nebula

I'm still playing with Narrowband imaging. This is my capture of the Omega Nebula using Ha = Red, SII = Blue, and OIII = Green. 2 1/2 hours of data. I could probably have used more data but by the time I finished the guider was being blocked by the dog house. 

 From Wikipedia: 

 The Omega Nebula, also known as the Swan Nebula, Checkmark Nebula, and the Horseshoe Nebula[1][2] (catalogued as Messier 17 or M17) is an H II region in the constellation Sagittarius. It was discovered by Philippe Loys de Chéseaux in 1745. Charles Messier catalogued it in 1764. It is located in the rich starfields of the Sagittarius area of the Milky Way.