M15. This globular cluster lies in the constellation of Pegasus. I captured one minute sub frames with matching dark frames combined with flat field frames to reduce the effect of vignetting in the final image. I was using my ten inch f/4.8 reflector, a Vixen Atlux mount, PHD auto guiding and an Atik 383L mono CCD camera. The filters I was using were H-alpha, S11 and O111 with total exposure times of 30 minutes for each filter.
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