M3 - Globular Cluster in Canes Venatici

M3 was discovered by Charles Messier in 1764. It is a large and bright globular cluster, containing 500,000 stars. There are many variable stars included.
Telescope: Orion 10 in. f/4.7 Newtonian
Camera: Modified Canon T2i (550D); ISO 800; Raw capture
Mount:  Losmandy G11
Guiding: SSAG on 50mm Lumicon finder scope
Exposures: 10 @ 3minutes
Processing: Images were focused using Live View. They were calibrated in Canon Digital Photo Professional and were aligned and combined in ImagesPlus. The composite was slightly cropped and adjusted (Levels, Curves) in Photoshop. Noise was reduced using Topaz DeNoise.
Note: Taken from my backyard observatory in southeastern Minnesota on 3/24/12. Humidity: 90%; Temp: 55F
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