Messier 17, the Omega nebula (also known as the Swan nebula) in Sagittarius. Tricky to capture as it never gets very far above the horizon when viewed from the UK.
Details: Nikon D7000, Nikkor 180mm f2.8 at f2.8. 36 minutes (144 x 15 seconds) at iso 1600. Using didymium filter. Stacked with Deep Sky Stacker and tracked with barn door tracker.