Celestial hemisphere:  Northern  ·  Constellation: Hercules (Her)  ·  Contains:  Hercules Globular Cluster  ·  IC 4617  ·  M 13  ·  NGC 6205
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M13 RGB (OSC) - The Great Hercules Cluster, andrea tasselli
M13 RGB (OSC) - The Great Hercules Cluster
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M13 RGB (OSC) - The Great Hercules Cluster

Getting plate-solving status, please wait...
M13 RGB (OSC) - The Great Hercules Cluster, andrea tasselli
M13 RGB (OSC) - The Great Hercules Cluster
Powered byPixInsight

M13 RGB (OSC) - The Great Hercules Cluster

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Description

Everyone and his/her dog must have tried this one at least once. I must have imaged it at least half a score times if not more. And no surprise since this is the premiere Globular Cluster in the boreal hemisphere. I decided to ditch all the others and present this one, the latest one (but most certainly not the last!). As It happens the image comes out of a series of tests with the MK67 and various focal reducers to see which one performed better and with what spacing. It turned out that none would really work for this sort of field width. But on the flip side I had the best image so far of M13. Had to crop a LOT to minimise field curvature aberrations (which are essentially astigmatic in nature, i.e. "eggy" stars toward the edge of the field) and the extra coma due to the FR itself.

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