discovered by Charles Messier in 1764. It is a large and bright globular
cluster, containing 500,000 stars. There are many variable stars included.
in. f/4.7 Newtonian; Baader coma corrector
||Modified Canon T2i (550D);
ISO 800; Raw capture
|| Losmandy G11
||SSAG on 50mm Lumicon
||10 @ 3minutes
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.
||Taken from my backyard
observatory in southeastern Minnesota on 3/24/12. Humidity: 90%; Temp:
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