Combination of 15, 1 minute images unfiltered.
SBIG STL-1001E CCD. 20" f/6.8 Dall-Kirkham cassegrain telescope at prime focus.
NGC 7789 is a very large open cluster in Casseopia. Although the total intergrated magnitude of the cluster is 6.7, the individual stars are around 10th magnitude or fainter, so a telescope is required for a good view. The cluster is so large that only the central regions are visible in the above image.