A context image here. To the right is the double cluster, on the left, the "heart" and the "Soul" Nebulae. See the wikipedia page for technical details. The image below is approx 400 exposures at 45 seconds/each ISO 3200. Taken on several nights in October and November 2011. Celestron C80ED f/7. Canon T1i Hutech + Astronomik CLS-CCD. LXD55
The Heart Nebula in Cassiopeia.