The great galaxy in Andromeda (M31) is an average stack of 8 photos, this was done to reduce noise, and there was a lot of processing afterwards in order to enhance the details and further reduce the noise.
Canon 300D was attached in Celestron ED80 with a T-ring in prime focus. During these 8 shots with duration for each of them 329s, 332s, 480s, 480s, 519s, 482s, 482s, 527s , I was manually guiding through Celestron C8 SCT and a red-cross illuminated eyepiece, something absolutely necessary in order to make corrections for the periodic and misalignment errors of the CG-5 GT mount.
This is the last processing of Andromeda that appears here //www.dpchallenge.com/image.php?IMAGE_ID=570985
I think it looks somehow better
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