M17 LRGB.tif
The Omega Nebula, also known as the Swan Nebula, Checkmark Nebula, Lobster Nebula, and the Horseshoe Nebula (catalogued as Messier 17 or M17 and as NGC 6618) is an H II region in the constellation Sagittarius.
LRGB 20,20,20
Atik 11000M,12" GSO Newtonian F4`