M11 The Wild Duck Cluster

This open star cluster lies in the constellation of Scutum at a distance of about 6,000 light years.I was using my ten inch F4.8 reflector, an Atik 383L mono CCD camera with PHD auto-guiding. I captured five minute sub-frames with matching dark frames and combined them with flat field frames to reduce the effect of vignetting in the final composition. The total exposure times was 35 minutes in red, 20 minutes in green and 30 minutes using a blue filter: