Equipment and other photo info:
Picture taken on June 5th, 2010.
Location: Petrova gora, Croatia, Europe
Celestron C10N @ f/4.7, Baader MPCC, QHY8, TS OAG9mm, QHY5 guiding camera
Exposure time: 23x5min
Mount: EQ6 Vis upgreded to EQ6 SynScan

Processing software: Nebulosity, PixInsight 1.0 LE, Photoshop CS4

Object info:
The famously named “Ring Nebula” is located in the northern constellation of Lyra, and also catalogued as Messier 57, M57 or NGC 6720. It is one of the most prominent examples of the deep-sky objects called planetary nebulae (singular, planetary nebula), often abbreviated by astronomers as simply planetaries or PNe.

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