I've had the C11 for a while now, but this is the first time I've used it try shooting a DSO. This is the famous Ring Nebula, M57, a planetary nebula in Lyra. You can just see a barred spiral galaxy IC1296 below and to the right.
Heritage Park Observatory, Cedar Park, TX
Exposure: 45 @ 120 sec (1.5 hours), ISO 1600
Camera: Canon Digital Rebel XT (350D) (Modified)
Scope: Celestron C11
Guider: ZS66, DSI
Software: Nebulosity, PHD Guiding, Photoshop