DAVE MASON   ASTROPHOTOGRAPHY
M13, THE GREAT GLOBULAR CLUSTER IN HERCULES

Messier 13, The Great Globular Cluster in Hercules, is a globular cluster of about 300,000 stars in the constellation of Hercules.

Technical info:
TS 80mm f6 APO triplet refractor - Canon 40D + IDAS LPS2 (light pollution) filter

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