Equipment and other photo info:
Picture taken on August 3th, 2011.
Location: Petrova gora, Croatia, Europe
SkyWatcher ED120/900, EQ6 SkyScan QHY8, Baader h-Alpha 7nm, TS OAG9mm, QHY5 guiding camera
Exposure time: 7x1200sec

Processing software: Nebulosity, DeepSkyStacker, PixInsight 1.0 LE, Photoshop CS5

Object info:
The Omega Nebula, also known as the Swan Nebula, Checkmark Nebula, Lobster Nebula, and the Horseshoe Nebula[2][1] (catalogued as Messier 17 or M17 and as NGC 6618) is an H II region in the constellation Sagittarius. It was discovered by Philippe Loys de Ch�seaux in 1745. Charles Messier catalogued it in 1764. It is located in the rich starfields of the Sagittarius area of the Milky Way.

More information about this object at: http://en.wikipedia.org/wiki/Omega_Nebula