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NGC6871, in the constellation of Cygnus, is a small cluster with no more than 50 members and is placed in front of the milky way. It is 5,100 light-years away and subtends 20 arc-minutes. This corresponds to a diameter of 30 light-years. Moving your mouse over the picture will show one which has been sharpened with Focus Magic. I often do this but, in this case, I felt that is reduced the contrast between the cluster and the background stars. What do you think? Date and Time: 16th September 2010 22:03 UT Camera: Canon 1000D Telescope: ST80 with X2 SLR lens (focal length 800 mm) Capture: 10, 20, 30 sec at ISO 1600 Processing: PhotoImpact. Reduction to 16% RegiStax. Stacked 3 frames, histogram 5-160 Mouseover only, Focus Magic 2, 100 |
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