This is an image of the star cluster Messier 52 showing some of the subtle star colors it and the surrounding stars have.
Details
Date 2012-06-20 in the early morning.
Clear slightly milky sky and 12 deg C with no wind.
Canon 5D MII camera on WO 105mm telescope with HEQ5 mount
Exposure - 4x120s frames at ISO 800 with 6 darks to match for calibration.
Processing in Images Plus and Photoshop.