Messier 17

The Swan Nebula, or the Omega Nebula, depending on its orientation.

Imaged it using LRGB, first time in doing so.  However, I was running out of time, as clouds were moving in.  The evening I imaged this, I first took a set at Oiii, which was not my intent, so I had to start again using Hα.  The image consists of 1 hour of Hα luminance, and only 10 mins each RGB color.

 

I found it very difficult getting the colors right.  The bottom image was a second attempt, although some like the top one better.